20SP0328 - Aerospace Contacts, L.L.C.

GE Energy

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Features

 Compliant to RoHS II EU “Directive 2011/65/EU”

 Compatible in a Pb-free or SnPb reflow environment (Z

versions)

 Compliant to IPC-9592 (September 2008), Category 2, Class II

 Compliant to REACH Directive (EC) No 1907/2006

 DOSA based

 Wide Input voltage range (4.5Vdc-14.4Vdc)

 Output voltage programmable from 0.51Vdc to 5.5Vdc via

external resistor and PMBus

TM #

 Digital interface through the PMBus

TM #

protocol

 Tunable Loop

to optimize dynamic output voltage response

 Flexible output voltage sequencing EZ-SEQUENCE

 Power Good signal

 Fixed switching frequency with capability of external

synchronization

 Output over current protection (non-latching)

 Over temperature protection

 Remote On/Off

 Ability to sink and source current

 Cost efficient open frame design

 Small size: 12.2 mm x 12.2 mm x 7.5 mm (0.48 in x 0.48 in x

0.295 in)

 Wide operating temperature range [-40°C to 85°C: Std; -40°C

to 105°C: Ruggedized]

 UL* 60950-1 2

Ed. Recognized, CSA

†

C22.2 No. 60950-1-07

Certified, and VDE

‡

(EN60950-1 2

Ed.) Licensed

 ISO** 9001 and ISO 14001 certified manufacturing facilities

Applications

 Distributed power architectures

 Intermediate bus voltage applications

 Telecommunications equipment

 Servers and storage applications

 Networking equipment

 Industrial equipment

Description

The 4A Digital PicoDLynxII

power modules are non-isolated dc-dc converters that can deliver up to 4A of output current. These

modules operate over a wide range of input voltage (V

= 4.5Vdc-14.4Vdc) and provide a precisely regulated output voltage from

0.51Vdc to 5.5Vdc, programmable via an external resistor and PMBus

control. Features include a digital interface using the

PMBus

protocol, remote On/Off, adjustable output voltage, over current and over temperature protection. The PMBus

TM #

interface supports a range of commands to both control and monitor the module. The module also includes the Tunable Loop

feature that allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output

capacitance leading to savings on cost and PWB area.

UL is a registered trademark of Underwriters Laboratories, Inc.

†

CSA is a registered trademark of Canadian Standards Association.

‡

VDE is a trademark of Verband Deutscher Elektrotechniker e.V.

** ISO is a registered trademark of the International Organization of Standards

The PMBus name and logo are registered trademarks of the System Management Interface Forum (SMIF)

TRIM

VOUT

VS+

GND

RTUNE

CTUNE

RTrim

VIN

Cin

Vout+Vin+

ON/OFF

SEQ

MODULE

PGOOD

SMBALRT#

SIG_GND

DDR1

RADDR0

CLK

DAT

DDR0

VS-

RADDR1

GND

SYNC

RoHS Com

liant

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings

only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations

sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.

Parameter Device Symbol Min Max Unit

Input Voltage All VIN -0.3 15 V

Continuous

VS, SMBALERT#, SEQ All -0.3 7 V

CLK, DATA, SYNC All 3.6 V

Operating Ambient Temperature All TA STANDARD -40 85 °C

(see Thermal Considerations section) RUGGEDIZED -40 105

Storage Temperature All Tstg -55 125 °C

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

Parameter Device Symbol Min Typ Max Unit

Operating Input Voltage All VIN 4.5

 14.4 Vdc

Maximum Input Current All IIN,max 4 Adc

(VIN=4.5V to 14V, IO=IO, max )

Input No Load Current

(VIN = 12Vdc, IO = 0, module enabled)

VO,set = 0.6 Vdc IIN,No load 29 mA

VO,set = 5.5Vdc IIN,No load 60 mA

Input Stand-by Current

(VIN = 12Vdc, module disabled) All IIN,stand-by 16 mA

Inrush Transient All I2t 1 A2s

Input Reflected Ripple Current, peak-to-peak

(5Hz to 20MHz, 1H source impedance; VIN =4.5 to 14V, IO= IOmax ;

See Test Configurations)

All 20 mAp-p

Input Ripple Rejection (120Hz) All -76 dB

Output Voltage Set-point accuracy over entire output range

0 to 85°C, Vo=over entire range All VO, set -0.5 +0.5 % VO, set

-40 to 85°C, Vo=over entire range All VO, set -1 +1 % VO, set

Voltage Regulation1

Line Regulation

(VIN=VIN, min to

VIN, max) 4 mV

(12VIN±20%) 1 mV

Load (IO=IO, min to IO, max) Regulation All 3 mV

1.8Vout 1 mV

1 Worst case Line and load regulation data, all temperatures, from design verification testing as per IPC9592.

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Electrical Specifications (continued)

Parameter Device Symbo

Min Typ Max Unit

Adjustment Range (selected by an external resistor)

(Some output voltages may not be possible depending on the

input voltage – see Feature Descriptions Section)

All VO 0.6 5.5 Vdc

PMBus Adjustable Output Voltage Range All VO,adj -15 0 +10 %VO,set

PMBus Output Voltage Adjustment Step Size All 0.4 %VO,set

Remote Sense Range All 0.5 Vdc

Output Ripple and Noise on nominal output

(VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1F // 3x22 F

ceramic capacitors)

Peak-to-Peak (5Hz to 20MHz bandwidth) All  17 mVpk-pk

RMS (5Hz to 20MHz bandwidth) All 5 mVrms

External Capacitance2

Without the Tunable LoopTM

ESR  1 m All CO, max 3x22  7x22 F

With the Tunable LoopTM

ESR  0.15 m All CO, max 3x22  1000 F

ESR  10 m All CO, max 3x22  5000 F

Output Current (in either sink or source mode) All Io 0 4 Adc

Output Current Limit Inception (Hiccup Mode)

(current limit does not operate in sink mode) All IO, lim 160 % Io,max

Output Short-Circuit Current All IO, s/c 3.9 Arms

(VO250mV) ( Hiccup Mode )

Efficiency VO,set = 0.6Vdc  77.5% %

VIN= 12Vdc, TA=25°C VO, set = 1.2Vdc  86.8% %

IO=IO, max , VO= VO,set V

O,set = 1.8Vdc  90.3% %

O,set = 2.5Vdc  92.4% %

O,set = 3.3Vdc  93.8% %

O,set = 5.0Vdc  94.6% %

Switching Frequency All fsw 500 kHz

2 External capacitors may require using the new Tunable LoopTM feature to ensure that the module is stable as well as getting the best

transient response. See the Tunable LoopTM section for details.

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Electrical Specifications (continued)

Parameter Device Symbol Min Typ Max Unit

Frequency Synchronization All

Synchronization Frequency Range (2 x fswitch) All 950 1000 1050 kHz

High-Level Input Voltage All VIH 2 V

Low-Level Input Voltage All VIL 0.4 V

Minimum Pulse Width, SYNC All tSYNC 100 ns

Maximum SYNC rise time All tSYNC_SH 100 ns

General Specifications

Parameter Device Min Typ Max Unit

Calculated MTBF (IO=0.8IO, max, TA=40°C) Telecordia Issue 3

Method 1 Case 3 All 81,291,063 Hours

Weight 2.2 (0.078) g (oz.)

Feature Specifications

Unless otherwise indicated, specifications apply overall operating input voltage, resistive load, and temperature conditions. See

Feature Descriptions for additional information.

Parameter Device Symbol Min Typ Max Unit

On/Off Signal Interface

(VIN=VIN, min to VIN, max ; open collector or equivalent,

Signal referenced to GND)

Device code with suffix “4” – Positive Logic (See Ordering

Information)

Logic High (Module ON)

Input High Current All IIH  17 µA

Input High Voltage All VIH 2.1  7 V

Logic Low (Module OFF)

Input Low Current All IIL   2 µA

Input Low Voltage All VIL -0.2  0.8 V

Device Code with no suffix – Negative Logic (See Ordering

Information)

(On/OFF pin is open collector/drain logic input with

external pull-up resistor; signal referenced to GND)

Logic High (Module OFF)

Input High Current All IIH — — 3 mA

Input High Voltage All VIH 2.1 — 7 Vdc

Logic Low (Module ON)

Input low Current All IIL — — 0.3 mA

Input Low Voltage All VIL -0.2 — 0.8 Vdc

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Feature Specifications (cont.)

Parameter Device Symbol Min Typ Max Units

Turn-On Delay and Rise Times

(VIN=VIN, nom, IO=IO, max , VO to within ±1% of steady state)

Case 1: On/Off input is enabled and then input power is

applied (delay from instant at which VIN = VIN, min until Vo =

10% of Vo, set)

All Tdelay 0.6 msec

Case 2: Input power is applied for at least one second and

then the On/Off input is enabled (delay from instant at

which Von/Off is enabled until Vo = 10% of Vo, set) All Tdelay 0.4 msec

Output voltage Rise time (time for Vo to rise from

10% of Vo, set to 90% of Vo, set) All Trise 2.8 msec

Output voltage overshoot (TA = 25oC

VIN= VIN, min to VIN, max,IO = IO, min to IO, max)

With or without maximum external capacitance

3.0 % VO, set

Over Temperature Protection

(See Thermal Considerations section) All Tref- °C

Tref- °C

PMBus Over Temperature Warning Threshold * All TWARN 115 °C

Tracking Accuracy (Power-Up: 2V/ms) All VSEQ –Vo 100 mV

(Power-Down: 2V/ms) All VSEQ –Vo 200 mV

(VIN, min to VIN, max; IO, min to IO, max VSEQ < Vo)

Input Undervoltage Lockout (Vout  3.3Vo)

Turn-on Threshold All 4.25 Vdc

Turn-off Threshold All 4.05 Vdc

Hysteresis All

0.2 Vdc

PMBus Adjustable Input Under Voltage Lockout Thresholds All 4 14 Vdc

Resolution of Adjustable Input Under Voltage Threshold All 250 mV

PGOOD (Power Good)

Signal Interface Open Drain, Vsupply  5VDC

Overvoltage threshold for PGOOD ON All 108.33 %VO, set

Overvoltage threshold for PGOOD OFF All 112.5 %VO, set

Undervoltage threshold for PGOOD ON All 91.67 %VO, set

Undervoltage threshold for PGOOD OFF All 87.5 %VO, set

Pulldown resistance of PGOOD pin All 40 70 

Sink current capability into PGOOD pin All 5 mA

* Over temperature Warning – Warning may not activate before alarm and unit may shutdown before warning

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Digital Interface Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See

Feature Descriptions for additional information.

Parameter Conditions Symbol Min Typ Max Unit

PMBus Signal Interface Characteristics

Input High Voltage (CLK, DATA) VIH 2.1 3.6 V

Input Low Voltage (CLK, DATA) VIL 0.8 V

Input high level current (CLK, DATA) IIH -10 10 A

Input low level current (CLK, DATA) IIL -10 10 A

Output Low Voltage (CLK, DATA, SMBALERT#) IOUT=2mA VOL 0.4 V

Output high level open drain leakage current (DATA,

SMBALERT#) VOUT=3.6V IOH 0 10 A

Pin capacitance CO 0.7 pF

PMBus Operating frequency range Slave Mode FPMB 10 400 kHz

Data hold time

Receive Mode

Transmit Mode tHD:DAT 0

300 ns

Data setup time tSU:DAT 250 ns

Measurement System Characteristics

Output current measurement range IRNG 0 6 A

Output current measurement accuracy @12Vin, 25°C to 85°C IACC -7 7% Max rated Current

Temperature measurement accuracy @12Vin, 0°C to 85°C TACC ±5 °C

VOUT measurement range VOUT(rng) 0 6 V

VOUT measurement accuracy VOUT, ACC -2 2 %

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Characteristic Curves

The following figures provide typical characteristics for the 4A Digital PicoDLynxII

at 0.6Vo and 25

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, I

(A) AMBIENT TEMPERATURE, T

Figure 1. Converter Efficiency versus Output Current. Figure 2. Derating Output Current versus Ambient Temperature

and Airflow.

OUTPUT VOLTAGE

(V) (10mV/div)

OUTPUT CURRENT OUTPUT OLTAGE

(A) 2Adiv) V

(V) (20mV/div)

TIME, t (1s/div) TIME, t (20s /div)

Figure 3. Typical output ripple (C

=3x22F ceramic, V

= 12V,

= I

o,max,

Figure 4. Transient Response to Dynamic Load Change from

50% to 100% at 12Vin, Cout=4x47uF+2x330uF, CTune=15nF,

RTune=300

OUTPUT VOLTAGE ON/OFF VOLTAGE

(V) (200mV/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

(V) (200mV/div) V

(V) (10V/div)

TIME, t (2ms/div) TIME, t (2ms/div)

Figure 5. Typical Start-up Using On/Off Voltage (I

= I

o,max

). Figure 6. Typical Start-up Using Input Voltage (V

= 12V, I

o,max

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Characteristic Curves

The following figures provide typical characteristics for the 4A Digital PicoDLynxII

at 1.2Vo and 25

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, I

(A) AMBIENT TEMPERATURE, T

Figure 7. Converter Efficiency versus Output Current. Figure 8. Derating Output Current versus Ambient Temperature

and Airflow.

OUTPUT VOLTAGE

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

(A) (2Adiv) V

(V) (20mV/div)

TIME, t (1s/div) TIME, t (20s /div)

Figure 9. Typical output ripple (C

=3x22F ceramic, V

= 12V,

= I

o,max,

Figure 10. Transient Response to Dynamic Load Change from

50% to 100% at 12Vin, Cout=8x47uF, CTune=4.7nF, RTune=300

OUTPUT VOLTAGE ON/OFF VOLTAGE

(V) (500mV/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

(V) (500mV/div) V

(V) (10V/div)

TIME, t (2ms/div) TIME, t (2ms/div)

Figure 11. Typical Start-up Using On/Off Voltage (I

= I

o,max

). Figure 12. Typical Start-up Using Input Voltage (V

= 12V, I

o,max

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Characteristic Curves

The following figures provide typical characteristics for the 4A Digital PicoDLynxII

at 1.8Vo and 25

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, I

(A) AMBIENT TEMPERATURE, T

Figure 13. Converter Efficiency versus Output Current. Figure 14. Derating Output Current versus Ambient

Tem

erature and Airflow.

OUTPUT VOLTAGE

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

(A) (2Adiv) V

(V) (20mV/div)

TIME, t (1s/div) TIME, t (20s /div)

Figure 15. Typical output ripple and noise (C

=3X22F ceramic,

= 12V, I

= I

o,max,

Figure 16. Transient Response to Dynamic Load Change from

50% to 100% at 12Vin, Cout=5x47uF, CTune=4.7nF, RTune=300

OUTPUT VOLTAGE ON/OFF VOLTAGE

(V) (500mV/div) V

ON/OFF

(V) 5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

(V) (500mV/div) V

(V) (10V/div)

TIME, t (2ms/div) TIME, t (2ms/div)

Figure 17. Typical Start-up Using On/Off Voltage (I

= I

o,max

). Figure 18. Typical Start-up Using Input Voltage (V

= 12V, I

o,max

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Characteristic Curves

The following figures provide typical characteristics for the 4A Digital PicoDLynxII

at 2.5Vo and 25

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, I

(A) AMBIENT TEMPERATURE, T

Figure 19. Converter Efficiency versus Output Current. Figure 20. Derating Output Current versus Ambient Temperature

and Airflow.

OUTPUT VOLTAGE

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

(A) (2Adiv) V

(V) (50mV/div)

TIME, t (1s/div) TIME, t (20s /div)

Figure 21. Typical output ripple and noise (C

=3x22F ceramic,

= 12V, I

= I

o,max,

Figure 22. Transient Response to Dynamic Load Change from

50% to 100% at 12Vin, Cout=3x47uF, CTune=1.5nF, RTune=300

OUTPUT VOLTAGE ON/OFF VOLTAGE

(V) (1V/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

(V) (1V/div) V

(V) (10V/div)

TIME, t (2ms/div) TIME, t (2ms/div)

Figure 23. Typical Start-up Using On/Off Voltage (I

= I

o,max

). Figure 24. Typical Start-up Using Input Voltage (V

= 12V, I

o,max

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Characteristic Curves

The following figures provide typical characteristics for the 4A Digital PicoDLynxII

at 3.3Vo and 25

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, I

(A) AMBIENT TEMPERATURE, T

Figure 25. Converter Efficiency versus Output Current. Figure 26. Derating Output Current versus Ambient

Temperature and Airflow.

OUTPUT VOLTAGE

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

(A) (2Adiv) V

(V) (50mV/div)

TIME, t (1s/div) TIME, t (20s /div)

Figure 27. Typical output ripple and noise (C

=3x22F ceramic,

= 12V, I

= I

o,max,

Figure 28 Transient Response to Dynamic Load Change from

50% to 100% at 12Vin, Cout=3x47uF, CTune=470pF,

RTune=300

OUTPUT VOLTAGE ON/OFF VOLTAGE

(V) (1V/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

(V) (1V/div) V

(V) (10V/div)

TIME, t (2ms/div) TIME, t (2ms/div)

Figure 29. Typical Start-up Using On/Off Voltage (I

= I

o,max

). Figure 30. Typical Start-up Using Input Voltage (V

= 12V, I

o,max

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 12

Characteristic Curves

The following figures provide typical characteristics for the 4A Digital PicoDLynxII

at 5.0Vo and 25

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, I

(A) AMBIENT TEMPERATURE, T

Figure 31. Converter Efficiency versus Output Current. Figure 32. Derating Output Current versus Ambient

Temperature and Airflow.

OUTPUT VOLTAGE

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

(A) (2Adiv) V

(V) (50mV/div)

TIME, t (1



s/div) TIME, t (20



s /div)

Figure 33. Typical output ripple and noise (C

=3x22F ceramic,

= 12V, I

= I

o,max,

Figure 34 Transient Response to Dynamic Load Change from

50% to 100% at 12Vin, Cout=2x47uF, CTune=220pF,

RTune=300

OUTPUT VOLTAGE ON/OFF VOLTAGE

(V) (2V/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

(V) (1V/div) V

(V) (10V/div)

TIME, t (2ms/div) TIME, t (2ms/div)

Figure 35. Typical Start-up Using On/Off Voltage (I

= I

o,max

). Figure 36. Typical Start-up Using Input Voltage (V

= 12V, I

o,max

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Design Considerations

Input Filtering

The 4A Digital PicoDLynxIITM module should be connected

to a low ac-impedance source. A highly inductive source

can affect the stability of the module. An input

capacitance must be placed directly adjacent to the input

pin of the module, to minimize input ripple voltage and

ensure module stability.

To minimize input voltage ripple, ceramic capacitors are

recommended at the input of the module. Figure 31

shows the input ripple voltage for various output voltages

at 4A of load current with 1x22 µF or 2x22 µF ceramic

capacitors and an input of 12V.

Input Ripple Voltage (mVp-p)

Output Voltage (Vdc)

Figure 37. Input ripple voltage for various output

voltages with 1x22 µF or 2x22 µF ceramic capacitors at

the input (4A load). Input voltage is 12V.

Output Filtering

These modules are designed for low output ripple voltage

and will meet the maximum output ripple specification with

0.1 µF ceramic and 3x22 µF ceramic capacitors at the

output of the module. However, additional output filtering

may be required by the system designer for a number of

reasons. First, there may be a need to further reduce the

output ripple and noise of the module. Second, the dynamic

response characteristics may need to be customized to a

particular load step change.

To reduce the output ripple and improve the dynamic

response to a step load change, additional capacitance at

the output can be used. Low ESR polymer and ceramic

capacitors are recommended to improve the dynamic

response of the module. Figure 32 provides output ripple

information for different external capacitance values at

various Vo and a full load current of 4A. For stable operation

of the module, limit the capacitance to less than the

maximum output capacitance as specified in the electrical

specification table. Optimal performance of the module can

be achieved by using the Tunable LoopTM feature described

later in this data sheet.

Figure 38. Output ripple voltage for various output

voltages with external 1x47 µF, 2x47 µF or 3x47 µF

ceramic capacitors at the output (4A load). Input voltage

is 12V.

Safety Considerations

For safety agency approval the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standards, i.e.,

ANSI/UL 60950-1 2nd Revised October 14, 2014, CSA C22.2

No. 60950-1-07, Second Ed. + A2:2014 (MOD), DIN EN 60950-

1:2006 + A11:2009 + A1:2010 +A12:2011, + A2:2013

(VDE0805 Teil 1: 2014-08)(pending).

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), the input

must meet SELV requirements. The power module has

extra-low voltage (ELV) outputs when all inputs are ELV.

An external 20A Littelfuse 456 series fast-acting fuse or

equivalent is recommended on the ungrounded input lead.

120

160

200

240

0.511.522.533.544.55

1x22uF

2x22 uF

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Output Ripple (mVp-p)

Output Voltage(Volts)

1x47uF Ext Cap

2x47uF Ext Cap

3x47uF Ext Cap

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 14

Analog Feature Descriptions

Remote On/Off

The module can be turned ON and OFF either by using the

ON/OFF pin (Analog interface) or through the PMBus

interface (Digital). The module can be configured in a

number of ways through the PMBus interface to react to the

two ON/OFF inputs:



Module ON/OFF can be controlled only through

the analog interface (digital interface ON/OFF

commands are ignored)



Module ON/OFF can be controlled only through

the PMBus interface (analog interface is ignored)



Module ON/OFF can be controlled by either the

analog or digital interface

The default state of the module (as shipped from the factory)

is to be controlled by the analog interface only. If the digital

interface is to be enabled, or the module is to be controlled

only through the digital interface, this change must be made

through the PMBus. These changes can be made and

written to non-volatile memory on the module so that it is

remembered for subsequent use.

Analog On/Off

The 4A Digital PicoDLynxII

power modules feature an

On/Off pin for remote On/Off operation. Two On/Off logic

options are available. In the Positive Logic On/Off option,

(device code suffix “4” – see Ordering Information), the

module turns ON during a logic High on the On/Off pin and

turns OFF during a logic Low. With the Negative Logic

On/Off option, (no device code suffix, see Ordering

Information), the module turns OFF during logic High and ON

during logic Low. The On/Off signal should be always

referenced to ground. For either On/Off logic option, leaving

the On/Off pin disconnected will turn the module ON when

input voltage is present.

For positive logic modules, the circuit configuration for using

the On/Off pin is shown in Figure 39. When the external

transistor Q1 is in the OFF state, the internal PWM #Enable is

pulled up internally, thus turning the module ON. When

transistor Q1 is turned ON, the On/Off pin is pulled low, and

consequently the internal PWM Enable signal is pulled low

and the module is OFF.

For negative logic On/Off modules, the circuit configuration

is shown in Fig. 40. The On/Off pin should be pulled high with

an external pull-up resistor. When transistor Q2 is in the OFF

state, the On/Off pin is pulled high, which pulls the internal

ENABLE# High and the module is OFF. To turn the module

ON, Q2 is turned ON pulling the On/Off pin low resulting in

the PWM ENABLE# pin going Low. The maximum voltage

allowed on the On/Off pin is 7V. If Vin is used as a source,

then a suitable external resistor R1 must be used to ensure

that the voltage on the On/Off pin does not exceed 7V.

Digital On/Off

Please see the Digital Feature Descriptions section.

Figure 39. Circuit configuration for using positive On/Off

logic.

Figure 40. Circuit configuration for using negative On/Off

logic.

Monotonic Start-up and Shutdown

The module has monotonic start-up and shutdown behavior

for any combination of rated input voltage, output current

and operating temperature range.

Startup into Pre-biased Output

The module can start into a prebiased output as long as the

prebias voltage is 0.5V less than the set output voltage.

Analog Output Voltage Programming

The output voltage of the module is programmable to any

voltage from 0.6dc to 5.5Vdc by connecting a resistor

between the Trim and SIG_GND pins of the module. Certain

restrictions apply on the output voltage set point depending

on the input voltage. These are shown in the Output Voltage

vs. Input Voltage Set Point Area plot in Fig. 35. The Upper

Limit curve shows that for output voltages lower than 1V,

the input voltage must be lower than the maximum of

40.2K

GND

ION/OFF

ENABLE

DLYNXII MODULE

6.5V

3.09K

GND

ON/OFF

ENABLE

DLYNXII MODULE

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 15

14.4V. The Lower Limit curve shows that for output voltages

higher than 3.3V, the input voltage needs to be higher than

the minimum of 4.5V.

Figure 41. Output Voltage vs. Input Voltage Set Point Area

plot showing limits where the output voltage can be set

for different input voltages.

VO(+)

TRIM

─

Rtrim

LOAD

VIN(+)

ON/OFF

VS+

SIG_GND

Caution –

Do not connect SIG_GND to GND elsewhere in the

layout

Figure 42. Circuit configuration for programming output

voltage using an external resistor.

Without an external resistor between Trim and SIG_GND

pins, the output of the module will be 0.6Vdc. To calculate

the value of the trim resistor,

Rtrim

for a desired output

voltage, should be as per the following equation:



















k

Rtrim 6.0

Rtrim is the external resistor in k

is the desired output voltage.

Table 1 provides Rtrim values required for some common

output voltages.

Table 1

O, set

(V) Rtrim (K)

0.6 Open

0.9 40

1.0 30

1.2 20

1.5 13.33

1.8 10

2.5 6.316

3.3 4.444

5.0 2.727

Digital Output Voltage Adjustment

Please see the Digital Feature Descriptions section.

Remote Sense

The power module has a Remote Sense feature to minimize

the effects of distribution losses by regulating the voltage

between the sense pins (VS+ and VS-). The voltage drop

between the sense pins and the VOUT and GND pins of the

module should not exceed 0.5V.

Analog Voltage Margining

Output voltage margining can be implemented in the

module by connecting a resistor, R

margin-up

, from the Trim pin

to the ground pin for margining-up the output voltage and

by connecting a resistor, R

margin-down

, from the Trim pin to

output pin for margining-down. Figure 43 shows the circuit

configuration for output voltage margining. The POL

Programming Tool or Power Module Wizard(PMW), available

at www.gecriticalpower.com under the Downloads section,

also calculates the values of R

margin-up

and R

margin-down

for a

specific output voltage and % margin. Please consult your

local GE technical representative for additional details.

Figure 43. Circuit Configuration for margining Output

voltage.

MODULE

SIG_GND

Trim

Rtrim

Rmargin-up

Rmargin-down

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 16

Digital Output Voltage Margining

Please see the Digital Feature Descriptions section.

Output Voltage Sequencing

The power module includes a sequencing feature, EZ-

SEQUENCE that enables users to implement various types of

output voltage sequencing in their applications. This is

accomplished via an additional sequencing pin. When not

using the sequencing feature, leave it unconnected.

When an analog voltage is applied to the SEQ pin, the

output voltage tracks this voltage until the output reaches

the set-point voltage. The final value of the SEQ voltage

must be set higher than the set-point voltage of the module.

The output voltage follows the voltage on the SEQ pin on a

one-to-one basis. By connecting multiple modules together,

multiple modules can track their output voltages to the

voltage applied on the SEQ pin.

For proper voltage sequencing, first, input voltage is applied

to the module. The On/Off pin of the module is left

unconnected (or tied to GND for negative logic modules or

tied to V

for positive logic modules) so that the module is

ON by default. After applying input voltage to the module, a

minimum 10msec delay is required before applying voltage

on the SEQ pin. This delay gives the module enough time to

complete its internal power-up soft-start cycle. During the

delay time, the SEQ pin should be held close to ground

(nominally 50mV ± 20 mV). This is required to keep the

internal op-amp out of saturation thus preventing output

overshoot during the start of the sequencing ramp. By

selecting resistor R1 (see fig. 44) according to the following

equation

05.05.6 26150

1

R = 4052ohms, (4.02K Std.)

the voltage at the sequencing pin will be 50mV when the

sequencing signal is at zero.

Figure 44. Circuit showing connection of the sequencing

signal to the SEQ pin.

After the 10msec delay, an analog voltage is applied to the

SEQ pin and the output voltage of the module will track this

voltage on a one-to-one volt bases until the output reaches

the set-point voltage. To initiate simultaneous shutdown of

the modules, the SEQ pin voltage is lowered in a controlled

manner. The output voltage of the modules tracks the

voltages below their set-point voltages on a one-to-one

basis. A valid input voltage must be maintained until the

tracking and output voltages reach ground potential.

When using the EZ-SEQUENCE

feature to control start-up

of the module, pre-bias immunity during start-up is disabled.

The pre-bias immunity feature of the module relies on the

module being in the diode-mode during start-up. When

using the EZ-SEQUENCE

feature, modules goes through an

internal set-up time of 10msec, and will be in synchronous

rectification mode when the voltage at the SEQ pin is applied.

This will result in the module sinking current if a pre-bias

voltage is present at the output of the module. When pre-

bias immunity during start-up is required, the EZ-

SEQUENCE

feature must be disabled. For additional

guidelines on using the EZ-SEQUENCE

feature please refer

to Application Note AN04-008 “Application Guidelines for

Non-Isolated Converters: Guidelines for Sequencing of

Multiple Modules”, or contact the GE technical representative

for additional information.

Overcurrent Protection

To provide protection in a fault (output overload) condition,

the unit is equipped with internal current-limiting circuitry

and can endure current limiting continuously. At the point of

current-limit inception, the unit enters hiccup mode. The unit

operates normally once the output current is brought back

into its specified range.

Digital Adjustable Overcurrent Warning

Please see the Digital Feature Descriptions section.

Overtemperature Protection

To provide protection in a fault condition, the unit is

equipped with a thermal shutdown circuit. The unit will shut

down if the over-temperature threshold of 120°C (typ) is

exceeded at the thermal reference point T

ref

.Please refer to

Electrical characteristic table, over-temperature section on

page 5. Once the unit goes into thermal shutdown it will

then wait to cool before attempting to restart.

Digital Temperature Status via PMBus

Please see the Digital Feature Descriptions section.

Digitally Adjustable Output Over and Under Voltage

Protection

Please see the Digital Feature Descriptions section.

Input Undervoltage Lockout

At input voltages below the input undervoltage lockout limit,

the module operation is disabled. The module will begin to

operate at an input voltage above the undervoltage lockout

turn-on threshold.

GND

6.5V

SEQ

OUT

10K

523K

MODULE

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Digitally Adjustable Input Undervoltage Lockout

Please see the Digital Feature Descriptions section.

Digitally Adjustable Power Good Thresholds

Please see the Digital Feature Descriptions section.

Synchronization

The module switching frequency can be synchronized to a

signal with an external frequency within a specified range.

Synchronization can be done by using the external signal

applied to the SYNC pin of the module as shown in Fig. 45,

with the converter being synchronized by the rising edge of

the external signal. The module switches at half the SYNC

frequency. The Electrical Specifications table specifies the

requirements of the external SYNC signal. If the SYNC pin is

not used, the module will free run at the default switching

frequency. If synchronization is not being used, connect

the SYNC pin to SIG_GND.

MODULE

SYNC

SIG_GND

─

Figure 45. External source connections to synchronize

switching frequency of the module.

Measuring Output Current and Output Voltage

Please see the Digital Feature Descriptions section.

Dual Layout

Identical dimensions and pin layout of Analog and Digital

PicoDLynxII modules permit migration from one to the other

without needing to change the layout. In both cases the trim

resistor is connected between trim and signal ground. The

output of the analog module cannot be trimmed down to

0.51V

Tunable LoopTM

The module has a feature that optimizes transient response

of the module called Tunable LoopTM.

External capacitors are usually added to the output of the

module for two reasons: to reduce output ripple and noise

(see Figure 38) and to reduce output voltage deviations from

the steady-state value in the presence of dynamic load

current changes. Adding external capacitance however

affects the voltage control loop of the module, typically

causing the loop to slow down with sluggish response. Larger

values of external capacitance could also cause the module

to become unstable.

The Tunable LoopTM allows the user to externally adjust the

voltage control loop to match the filter network connected to

the output of the module. The Tunable LoopTM is implemented

by connecting a series R-C between the VS+ and TRIM pins of

the module, as shown in Fig. 46. This R-C allows the user to

externally adjust the voltage loop feedback compensation of

the module.

Figure. 46. Circuit diagram showing connection of RTUME

and CTUNE to tune the control loop of the module.

Recommended values of RTUNE and CTUNE for different output

capacitor combinations are given in Tables 2 and 3. Table 3

shows the recommended values of RTUNE and CTUNE for

different values of ceramic output capacitors up to 1000uF

that might be needed for an application to meet output

ripple and noise requirements. Selecting RTUNE and CTUNE

according to Table 3 will ensure stable operation of the

module.

In applications with tight output voltage limits in the

presence of dynamic current loading, additional output

capacitance will be required. Table 3 lists recommended

values of RTUNE and CTUNE in order to meet 2% output

voltage deviation limits for some common output voltages

in the presence of a 3.5A to 4A step change (50% of full

load), with an input voltage of 12V.

Please contact your GE technical representative to obtain

more details of this feature as well as for guidelines on how

to select the right value of external R-C to tune the module

for best transient performance and stable operation for

other output capacitance values.

Table 2. General recommended values of of RTUNE and

CTUNE for Vin=12V and various external ceramic capacitor

combinations.

Co 4x47F 6x47F 8x47F 10x47F 20x47F

RTUNE 300 300 300 300 300

CTUNE 220p 330p 390p 470p 1.8n

VS+

MODULE

SIG_GND

TRIM

VOUT

RTune

CTune

RTrim

GND

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Table 3. Recommended values of RTUNE and CTUNE to obtain

transient deviation of 2% of Vout for a 10A step load with

Vin=12V.

Vo 5V 3.3V 2.5V 1.8V 1.2V 0.6V

Co 2x47uf 3x47uF 3x47uF 5x47uF 8x47uF

4x47uF

2x330uF

RTUNE 300 300 300 300 300 300

CTUNE 220pF 470pF 1500pF 1800pF 4.7nF 15nF

V 67mV 51mV 35mV 29mV 18mV 9mV

Note: The capacitors used in the Tunable Loop tables are

47 F/3 m ESR ceramic and 330 F/12 m ESR polymer

capacitors.

Power Module Wizard

GE offers a free web based easy to use tool that helps users

simulate the Tunable Loop performance of the PJT004. Go

to http://ge.transim.com/pmd/Home and sign up for a free

account and use the module selector tool. The tool also

offers downloadable Simplis/Simetrix models that can be

used to assess transient performance, module stability, etc.

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Digital Feature Descriptions

PMBus Interface Capability

The 4A Digital PicoDLynxIITM power modules have a PMBus

interface that supports both communication and control.

The PMBus Power Management Protocol Specification can

be obtained from www.pmbus.org. The modules support a

subset of version 1.1 of the specification (see Table 6 for a

list of the specific commands supported). Most module

parameters can be programmed using PMBus and stored as

defaults for later use.

All communication over the module PMBus interface must

support the Packet Error Checking (PEC) scheme. The PMBus

master must generate the correct PEC byte for all

transactions, and check the PEC byte returned by the

module.

The module also supports the SMBALERT# response

protocol whereby the module can alert the bus master if it

wants to talk. For more information on the SMBus alert

response protocol, see the System Management Bus

(SMBus) specification.

The module has non-volatile memory that is used to store

configuration settings. Not all settings programmed into the

device are automatically saved into this non-volatile

memory, only those specifically identified as capable of

being stored can be saved (see Table 6 for which command

parameters can be saved to non-volatile storage).

PMBus Data Format

For commands that set thresholds, voltages or report such

quantities, the module supports the “Linear” data format

among the three data formats supported by PMBus. The

Linear Data Format is a two byte value with an 11-bit, two’s

complement mantissa and a 5-bit, two’s complement

exponent. The format of the two data bytes is shown below:

Data Byte High

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

Data Byte Low

Exponent

MSB Mantissa

MSB

The value is of the number is then given by

Value = Mantissa x 2 Exponent

PMBus Addressing

The power module can be addressed through the PMBus

using a device address. The module has 64 possible

addresses (0 to 63 in decimal) which can be set using

resistors connected from the ADDR0 and ADDR1 pins to

GND. Note that some of these addresses (0, 1, 2, 3, 4, 5, 6, 7,

8, 9, 10, 11 12, 40, 44, 45, 55 in decimal) are reserved

according to the SMBus specifications and may not be

useable. The address is set in the form of two octal (0 to 7)

digits, with each pin setting one digit. The ADDR1 pin sets

the high order digit and ADDR0 sets the low order digit. The

resistor values suggested for each digit are shown in Table 4

(1% tolerance resistors are recommended). Note that if

either address resistor value is outside the range specified in

Table 4, the module will respond to address 127.

Table 4

Digit Resistor Value (K)

0 11

1 18.7

2 27.4

3 38.3

4 53.6

5 82.5

6 127

7 187

The user must know which I2C addresses are reserved in a

system for special functions and set the address of the

module to avoid interfering with other system operations.

Both 100kHz and 400kHz bus speeds are supported by the

module. Connection for the PMBus interface should follow

the High Power DC specifications given in section 3.1.3 in the

SMBus specification V2.0 for the 400kHz bus speed or the

Low Power DC specifications in section 3.1.2. The complete

SMBus specification is available from the SMBus web site,

smbus.org.

DDR0

SIG GND

ADDR0

ADDR1

DDR1

Figure 47. Circuit showing connection of resistors used to

set the PMBus address of the module.

Operation (01h)

This is a paged register. The OPERATION command can be

use to turn the module on or off in conjunction with the

ON/OFF pin input. It is also used to margin up or margin

down the output voltage

PMBus Enabled On/Off

The module can also be turned on and off via the PMBus

interface. The OPERATION command is used to actually turn

the module on and off via the PMBus, while the

ON_OFF_CONFIG command configures the combination of

analog ON/OFF pin input and PMBus commands needed to

turn the module on and off. Bit [7] in the OPERATION

command data byte enables the module, with the following

functions:

0 : Output is disabled

1 : Output is enabled

This module uses the lower five bits of the ON_OFF_CONFIG

data byte to set various ON/OFF options as follows:

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Bit Position 4 3 2 1 0

Access r/w r/w r/w r/w r

Function PU CMD CPR POL CPA

Default Value 1 0 1 1 0

PU: Sets the default to either operate any time input power

is present or for the ON/OFF to be controlled by the analog

ON/OFF input and the PMBus OPERATION command. This bit

is used together with the CP, CMD and ON bits to determine

startup.

Bit Value Action

Module powers up any time power is

present regardless of state of the analog

ON/OFF pin

Module does not power up until

commanded by the analog ON/OFF pin and

the OPERATION command as programmed

in bits [2:0] of the ON_OFF_CONFIG register.

CMD: The CMD bit controls how the device responds to the

OPERATION command.

Bit Value Action

0 Module ignores the ON bit in the

OPERATION command

1 Module responds to the ON bit in the

OPERATION command

CPR: Sets the response of the analog ON/OFF pin. This bit is

used together with the CMD, PU and ON bits to determine

startup.

Bit Value Action

Module ignores the analog ON/OFF pin, i.e.

ON/OFF is only controlled through the

PMBUS via the OPERATION command

1 Module requires the analog ON/OFF pin to

be asserted to start the unit

CPA: Sets the action of the analog ON/OFF pin when turning

the controller OFF. This bit is internally read and cannot be

modified by the user

PMBus Adjustable Soft Start Rise Time

The soft start rise time can be adjusted in the module via

PMBus. When setting this parameter, make sure that the

charging current for output capacitors can be delivered by

the module in addition to any load current to avoid nuisance

tripping of the overcurrent protection circuitry during

startup. The TON_RISE command sets the rise time in ms,

and allows choosing soft start times between 600s and

9ms, with possible values listed in Table 5. Note that the

exponent is fixed at -4 (decimal) and the upper two bits of

the mantissa are also fixed at 0.

Table 5

Rise Time Exponent Mantissa

600s 11100 00000001010

900s 11100 00000001110

1.2ms 11100 00000010011

1.8ms 11100 00000011101

2.7ms 11100 00000101011

4.2ms 11100 00001000011

6.0ms 11100 00001100000

9.0ms 11100 00010010000

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Output Voltage Adjustment Using the PMBus

The VREF_TRIM parameter is important for a number of

PMBus commands related to output voltage trimming, and

margining. Each of the 2 output voltages of the module can

be set as the combination of the voltage divider formed by

RTrim and a 20k upper divider resistor inside the module,

and the internal reference voltage of the module. The

reference voltage VREF is be nominally set at 600mV, and the

output regulation voltage is then given by:

REFOUT V

RTrim

V













20000

Hence the module output voltage is dependent on the value

of RTrim which is connected external to the module.

The VREF_TRIM parameter is used to apply a fixed offset

voltage to the reference voltage can be specified using the

“Linear” format and two bytes. The exponent is fixed at –9

(decimal). The resolution of the adjustment is 7 bits, with a

resulting step size of approximately 0.4%. The maximum

trim range is -20% to +10% of the nominal reference

voltage(600mV) in 2mV steps. Possible values range from -

120mV to +60mV. The exception is at 0.6Vout where the

allowable trim range is only -90mV to +60mV to prevent the

module from operating at lower than 0.51Vdc. When

trimming the voltage below 0.6V, the module max. input

voltage operating point also reduces proportionally. As

shown earlier in Fig.41, the maximum permissible input

voltage is 13V. For any voltage trimmed below 0.6V, the

maximum input voltage will have to be reduced by the same

factor.

When PMBus commands are used to trim or margin the

output voltage, the value of VREF is what is changed inside

the module, which in turn changes the regulated output

voltage of the module.

The nominal output voltage of the module is adjustable with

a minimum step size of 0.4% over a +10% to -20% range

from nominal using the VREF_TRIM command over the

PMBus.

The VREF_TRIM command can be used to apply a fixed

offset voltage to either of the output voltage command

value using the “Linear” mode with the exponent fixed at –9

(decimal). The value of the offset voltage is given by

)( 2_ 

 TRIMVREFV offsetREF

This offset voltage is added to the voltage set through the

divider ratio and nominal VREF to produce the trimmed

output voltage. If a value outside of the +10%/-20%

adjustment range is given with this command, the module

will set it’s output voltage to the upper or lower limit value

(as if VOUT_TRIM, assert SMBALRT#, set the CML bit in

STATUS_BYTE and the invalid data bit in STATUS_CML.

Applications Example

For a design where the output voltage is 1.8V and the output

needs to be trimmed down by 20mV.

• The internal reference voltage is 0.6V. So we need to

determine how the 20mV translates to a change in the

internal reference voltage.

 Divider Ratio = Vref/Vout = 0.6/1.8 = 0.33

 Hence a 20mV change at 1.8Vo requires a 0.33x20mV =

6.6mV change in the reference voltage.

 Vref(offset) = - (6.6)/1000 = - 0.0066 Volts (- sign since

we are trimming down)

 V

ref(offset) = Vref_Trim x 2 -9

 V

ref_Trim = Vref(offset) x 512

 V

ref_Trim = -0.0066 x 512 = -3.3 = -3 (rounded to nearest

integer

Output Voltage Margining Using the PMBus

The module can also have its output margined via PMBus

commands. The command STEP_VREF_MARGIN_HIGH will

set the margin high voltage, while the command

STEP_VREF_MARGIN_LOW sets the margin low voltage. Both

the STEP_VREF_MARGIN_HIGH and

STEP_VREF_MARGIN_LOW commands will use the “Linear”

mode with the exponent fixed at –9 (decimal). Two bytes are

used for the mantissa with the upper bit [7] of the high byte

fixed at 0. The actual margined output voltage is a

combination of the STEP_VREF_MARGIN_HIGH or

STEP_VREF_MARGIN_LOW and the VREF_TRIM values as

shown below. The net permissible voltage range change is -

30% to +10% for the margin high command and -20% to

0% for the margin low command

)(

2)____( 





TRIMVREFHIGHMARGINVREFSTEP

VMHREF

Applications Example

For a design where the output voltage is 1.2V and the output

needs to be trimmed up by 100mV (within 10% of Vo).

• The internal reference voltage is 0.6V. So we need to

determine how the 100mV translates to a change in the

internal reference voltage.

 Divider Ratio = Vref/Vout = 0.6/1.2 = 0.5

 Hence a 100mV change at 1.2Vo requires a 0.5x100mV =

50mV change in the reference voltage.

 VREF(MH) = (50)/1000 = 0.05 Volts

 V

REF(MH) = (Step_Vref_margin_high + Vref_trim) x 2 -9

 Assume Vref_Trim = 0 here

 Step_Vref_margin_high = VREF(MH) x 512

 Step_Vref_margin_high = 0.05 x 25.6 = 26 (rounded to nearest

integer

)(

2)____( 





TRIMVREFLOWMARGINVREFSTEP

VMLREF

Applications Example

For a design where the output voltage is 1.8V and the output

needs to be trimmed down by 100mV (within -20% of Vo).

• The internal reference voltage is 0.6V. So we need to

determine how the 100mV translates to a change in the

internal reference voltage.

 Divider Ratio = Vref/Vout = 0.6/1.8 = 0.33

 Hence a 100mV change at 1.2Vo requires a 0.33x100mV =

33mV change in the reference voltage.

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

 VREF(MH) = -(33)/1000 = - 0.033 Volts (- sign since we are

margining down)

 V

REF(ML) = (Step_Vref_margin_low + Vref_trim) x 2 -9

 Assume Vref_Trim = - 3 here (from V Ref_Trim example

earlier)

 Step_Vref_margin_low = VREF(ML) x 512 - Vref_trim

 Step_Vref_margin_low = -0.033 x 512 – (-3) = -16.9+3 = -13.9 =

-14 (rounded to nearest integer

The module will support the margined high or low voltages

using the OPERATION command. Bits [5:2] are used to

enable margining as follows:

 00XX : Margin Off

 0101 : Margin Low (Act on Fault)

 0110 : Margin Low (Act on Fault)

 1001 : Margin High (Act on Fault)

 1010 : Margin High (Act on Fault)

PMBus Adjustable Overcurrent Warning

The module can provide an overcurrent warning via the

PMBus. The threshold for the overcurrent warning can be

set using the parameter IOUT_OC_WARN_LIMIT. This

command uses the “Linear” data format with a two byte

data word where the upper five bits [7:3] of the high byte

represent the exponent and the remaining three bits of the

high byte [2:0] and the eight bits in the low byte represent

the mantissa. The exponent is fixed at –1 (decimal). The

upper five bits of the mantissa are fixed at 0 while the lower

six bits are programmable with a default value of 19A

(decimal). The resolution of this warning limit is 500mA. The

value of the IOUT_OC_WARN_LIMIT can be stored to non-

volatile memory using the STORE_DEFAULT_ALL command

Temperature Status via PMBus

The module will provide information related to temperature

of the module through the READ_TEMPERATURE_2

command. The command returns external temperature in

degrees Celsius. This command will use the “Linear” data

format with a two byte data word where the upper five bits

[7:3] of the high byte will represent the exponent and the

remaining three bits of the high byte [2:0] and the eight bits

in the low byte will represent the mantissa. The exponent is

fixed at 0 (decimal). The lower 11 bits are the result of the

ADC conversion of the external temperature

PMBus Adjustable Output Over, Under Voltage

Protection and Power Good

The module has a common command to set the PGOOD,

VOUT_UNDER_VOLTAGE(UV) and VOUT_OVER_VOLTAGE (OV)

limits as a percentage of nominal. Refer to Table 6 of the

next section for the available settings. The PMBus command

VOUT_OVER_VOLTAGE (OV) is used to set the output over

voltage threshold from two possible values: +12.5% or

+16.67% of the commanded output voltage for each output.

The module provides a Power Good (PGOOD) that is

implemented with an open-drain output to indicate that the

output voltage is within the regulation limits of the power

module. The PGOOD signal is de-asserted to a low state if

any condition such as overtemperature, overcurrent or loss

of regulation occurs that would result in the output voltage

going outside the specified thresholds. The PGOOD

thresholds are user selectable via the PMBus (the default

values are as shown in the Feature Specifications Section).

Each threshold is set up symmetrically above and below the

nominal value. The PGL (POWERGOODLOW) command will

set the output voltage level above which PGOOD is asserted

(lower threshold). The PGH(POWERGOODHIGH) command

will set the level above which the PGOOD command is de-

asserted. This command will also set two thresholds

symmetrically placed around the nominal output voltage.

Normally, the PGL threshold is set higher than the PGH

threshold.

The PGOOD terminal can be connected through a pullup

resistor (suggested value 100K) to a source of 5VDC or

lower. The current through the PGood terminal should be

limited to a max value of 5mA

PMBus Adjustable Input Undervoltage Lockout

The module allows for adjustment of the input under voltage

lockout and hysteresis. The command VIN_ON allows setting

the input voltage turn on threshold for each output, while

the VIN_OFF command will set the input voltage turn off

threshold. For the VIN_ON command, possible values are

4.25V to 16V in variable steps. For the VIN_OFF command,

possible values are 4V to 15.75V in 0.5V steps. If other values

are entered for either command, they is mapped to the

closest of the allowed values.

Both the VIN_ON and VIN_OFF commands use the “Linear”

format with two data bytes. The upper five bits will represent

the exponent (fixed at -2) and the remaining 11 bits will

represent the mantissa. For the mantissa, the four most

significant bits are fixed at 0.

Measurement of Output Current and Voltage

The module is capable of measuring key module

parameters such as output current and voltage and

providing this information through the PMBus interface.

Measuring Output Current Using the PMBus

The module measures current by using the inductor winding

resistance as a current sense element. The inductor winding

resistance is then the current gain factor used to scale the

measured voltage into a current reading. This gain factor is

the argument of the IOUT_CAL_GAIN command, and

consists of two bytes in the linear data format. The exponent

uses the upper five bits [7:3] of the high data byte in two-s

complement format and is fixed at –4 (decimal). The

remaining 11 bits in two’s complement binary format

represent the mantissa. During manufacture, each module

is calibrated by measuring and storing the current gain

factor into non-volatile storage. DONOT CHANGE THE

FACTORY PROGRAMMED VALUE

The current measurement accuracy is also improved by

each module being calibrated during manufacture with the

offset in the current reading. The IOUT_CAL_OFFSET

command is used to store and read the current offset. The

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

argument for this command consists of two bytes

composed of a 5-bit exponent (fixed at -4d) and a 11-bit

mantissa. This command has a resolution of 62.5mA and a

range of -4000mA to +3937.5mA. DONOT CHANGE THE

FACTORY PROGRAMMED VALUE.

The READ_IOUT command provides module average output

current information. This command only supports positive or

current sourced from the module. If the converter is sinking

current a reading of 0 is provided. The READ_IOUT

command returns two bytes of data in the linear data

format. The resolution of the command is 62.5mA. The

exponent uses the upper five bits [7:3] of the high data byte

in two-s complement format and is fixed at –4 (decimal). The

remaining 11 bits in two’s complement binary format

represent the mantissa with the 11th bit fixed at 0 since only

positive numbers are considered valid.

Measuring Output Voltage Using the PMBus

The module provides output voltage information using the

READ_VOUT command for each output. In this module the

output voltage is sensed at the remote sense amplifier

output pin so voltage drop to the load is not accounted for.

The command will return two bytes of data all representing

the mantissa while the exponent is fixed at -9 (decimal).

Reading the Status of the Module using the PMBus

The module supports a number of status information

commands implemented in PMBus. However, not all

features are supported in these commands. A 1 in the bit

position indicates the fault that is flagged.

STATUS_BYTE : Returns one byte of information with a

summary of the most critical device faults.

Bit

Position Flag Default

Value

7 X 0

6 OFF 0

5 VOUT Overvoltage 0

4 IOUT Overcurrent 0

3 VIN Undervoltage 0

2 Temperature 0

1 CML (Comm. Memory Fault) 0

0 None of the above 0

STATUS_WORD : Returns two bytes of information with a

summary of the module’s fault/warning conditions.

Low Byte

Bit

Position Flag Default

Value

7 X 0

6 OFF 0

5 VOUT Overvoltage 0

4 IOUT Overcurrent 0

3 VIN Undervoltage 0

2 Temperature 0

1 CML (Comm. Memory Fault) 0

0 None of the above 0

High Byte

Bit

Position Flag Default

Value

7 VOUT fault or warning 0

6 IOUT fault or warning 0

5 X 0

4 MFR 0

3 POWER_GOOD# (is negated) 0

2 X 0

1 X 0

0 X 0

STATUS_VOUT : Returns one byte of information relating to

the status of the module’s output voltage related faults.

Bit

Position Flag Default

Value

7 VOUT OV Fault 0

6 X 0

5 X 0

4 VOUT UV Fault 0

3 X 0

2 X 0

1 X 0

0 X 0

STATUS_IOUT : Returns one byte of information relating to

the status of the module’s output voltage related faults.

Bit

Position Flag Default

Value

7 IOUT OC Fault 0

6 X 0

5 IOUT OC Warning 0

4 X 0

3 X 0

2 X 0

1 X 0

0 X 0

STATUS_TEMPERATURE : Returns one byte of information

relating to the status of the module’s temperature related

faults.

Bit

Position Flag Default

Value

7 OT Fault 0

6 OT Warning 0

5 X 0

4 X 0

3X 0

2 X 0

1 X 0

0 X 0

STATUS_CML : Returns one byte of information relating to

the status of the module’s communication related faults.

Bit

Position Flag Default

Value

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

7 Invalid/Unsupported Command 0

6 Invalid/Unsupported Command 0

5 Packet Error Check Failed 0

4 Memory Fault Detected 0

3 X 0

2 X 0

1 Other Communication Fault 0

0 X 0

MFR_VIN_MIN : Returns minimum input voltage as two data

bytes of information in Linear format (upper five bits are

exponent – fixed at -2, and lower 11 bits are mantissa in

two’s complement format – fixed at 12)

MFR_VOUT_MIN : Returns minimum output voltage as two

data bytes of information in Linear format (upper five bits

are exponent – fixed at -10, and lower 11 bits are mantissa

in two’s complement format – fixed at 614)

MFR_SPECIFIC_00 : Returns information related to the type

of module and revision number. Bits [7:2] in the Low Byte

indicate the module type (010101 corresponds to the

PJT004 series of module), while bits [7:3] indicate the

revision number of the module.

Low Byte

Bit

Position Flag Default

Value

7:2 Module Name 010101

1:0 Reserved 10

High Byte

Bit

Position Flag Default

Value

7:3 Module Revision Number None

2:0 Reserved 000

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Summary of Supported PMBus Commands

Please refer to the PMBus 1.1 specification for more details of these commands.

Table 6

Hex

Code Command Brief Description Non-Volatile

Memory Storage

01 OPERATION

Turn Module on or off. Also used to margin the output voltage

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r/w r r/w r/w r/w r/w r r

Function On X Margin X X

Default Value 0 0 0 0 0 0 X X

Bit 7: 0 Output switching disabled

1 Output switching enabled

Margin: 00XX Margin Off

0101 Margin Low ( Act on fault)

0110 Margin Low (Act on fault)

1001 Margin High (Act on fault)

1010 Margin High (Act on fault)

02 ON_OFF_CONFIG

Configures the ON/OFF functionality as a combination of analog ON/OFF pin

and PMBus commands

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r/w r/w r/w r/w r

Function X X X pu cmd cpr pol cpa

Default Value 0 0 0 1 0 1 1 0

Refer to Page 19 for details on pu, cmd, cpr, pol and cpa

YES

03 CLEAR_FAULTS

Clear any fault bits that may have been set, also releases the SMBALERT# signal

if the device has been asserting it.

10 WRITE_PROTECT

Used to control writing to the module via PMBus. Copies the current register

setting in the module whose command code matches the value in the data byte

into non-volatile memory (EEPROM) on the module

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r/w r/w r/w xxxx x

Function bit7 bit6 bit5 X X X X X

Default Value 0 0 0 X X X X X

Bit5: 0 – Enables all writes as permitted in bit6 or bit7

1 – Disables all writes except the WRITE_PROTECT, PAGE OPERATION

and ON_OFF_CONFIG (bit 6 and bit7 must be 0)

Bit 6: 0 – Enables all writes as permitted in bit5 or bit7

1 – Disables all writes except for the WRITE_PROTECT, PAGE and

OPERATION commands (bit5 and bit7 must be 0)

Bit7: 0 – Enables all writes as permitted in bit5 or bit6

1 – Disables all writes except for the WRITE_PROTECT command

(bit5 and bit6 must be 0)

YES

15 STORE_USER_ALL

Stores all of the current storable register settings in the EEPROM memory as the

new defaults on power up

16 RESTORE_USER_ALL

Restores all of the storable register settings from the non-volatile memory

(EEPROM). The command should not be used while the device is actively

switching

19 CAPABILITY

This command helps the host system/GUI/CLI determine key capabilities of the

module

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function PEC SPD ALRT Reserved

Default Value 1 0 1 1 0 0 0 0

PEC – 1 Supported

SPD -01 – max of 400kHZ

ALRT – 1 – SMBALERT# supported

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Hex

Code Command Brief Description Non-Volatile

Memory Storage

20 VOUT_MODE

The module has MODE set to Linear and Exponent set to -10. These values

cannot be changed

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mode Exponent

Default Value 0 0 0 1 0 1 1 1

Mode: Value fixed at 000, linear mode

Exponent: Value fixed at 10111, Exponent for linear mode values is -9

35 VIN_ON

Sets the value of input voltage at which the module turns on

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r

Function Exponent Mantissa

Default Value 1 1 1 1 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 0 0 1 0 0 0 1

Exponent -2 (dec), fixed

Mantissa

The upper four bits are fixed at 0

The lower seven are programmable with a default value of 9(dec). This

corresponds to a default of 4.25V. Allowable values are

 4.25, in steps of 0.25V upto 9.5V.

 9.5V to 13V in increments of 0.5V

 13V to 16V in increments of 1V

YES

36 VIN_OFF

Sets the value of input voltage at which the module turns off

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Exponent Mantissa

Default Value 1 1 1 1 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 0 0 0 1 0 0 0

Exponent -2 (dec), fixed

Mantissa

The upper four bits are fixed at 0

The lower seven are programmable with a default value of 8(dec). This

corresponds to a default of 4.0V.

Allowable values are

 4.00, in steps of 0.25V upto 9.75V.

 10.25V to 11.75V in increments of 0.5V

 12V

 13.75V to 15.75V in increments of 1V

YES

38 IOUT_CAL_GAIN

Returns the value of the gain correction term used to correct the measured

output current

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r/w

Function Exponent Mantissa

Default Value 1 0 0 0 1 0 0 V

Bit Position 7 6 5 4 3 2 1 0

Access r/w r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value V: Variable based on factory calibration

YES

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Table 6 (Continued)

Hex

Code Command Brief Description Non-Volatile

Memory Storage

39 IOUT_CAL_OFFSET

Returns the value of the offset correction used to correct the measured output

current

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r/w r r

Function Exponent Mantissa

Default Value 1 1 1 0 0 V V V

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value V: Variable based on factory calibration

YES

IOUT_OC_FAULT_LIMIT

Value maybe locked

Sets the output overcurrent fault level in A (cannot be changed)

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Exponent Mantissa

Default Value 1 1 1 1 1 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 0 TBD TBD TBD TBD TBD TBD

YES

47 IOUT_OC_FAULT_RESPONSE

Determines module action in response to an IOU_OC_FAULT_LIMIT or a VOUT

undervoltage (UV) fault

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w r/w r/w rr r

Function X X

[2]

[1]

[0] x X X

Default Value 0 0 1 1 1 1 0 0

RS[2:0] – Retry Setting

000 Unit does not attempt to restart

111 Unit goes through normal soft start continuously

Any other value is not acceptable

YES

IOUT_OC_WARN_LIMIT

Value may be locked

Sets the output overcurrent warning level in A

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Exponent Mantissa

Default Value 1 1 1 1 1 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 0 TBD TBD TBD TBD TBD TBD

OT_FAULT_LIMIT

Value may be locked

Sets the overtemperature fault level in °C

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Exponent Mantissa

Default Value 0 0 0 0 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r/w r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 1 1 1 1 1 0 1

YES

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Hex

Code Command Brief Description Non-Volatile

Memory Storage

OT_WARN_LIMIT

Value may be locked

Sets the over temperature warning level in °C

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Exponent Mantissa

Default Value 0 0 0 0 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r/w r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 1 1 1 1 0 0 0

YES

61 TON_RISE

Sets the rise time of the output voltage during startup.

Supported Values – 0.6, 0.9, 1.2, 1.8, 2.7, 4.2, 6.0, 9.0msec. Value of 0 instructs unit to

bring its output to programmed value as quickly as possible

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r/w

Function Exponent Mantissa

Default Value 1 1 1 0 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r/w r/w r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value 0 1 1 0 0 0 0 0

YES

78 STATUS_BYTE

Returns one byte of information with a summary of the most critical module faults

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Flag X OFF

VOUT

_OV

IOUT_

VIN_U

V TEMP CML

None

of the

Above

Default Value 0 0 0 0 0 0 0 0

79 STATUS_WORD

Returns two bytes of information with a summary of the module’s fault/warning

conditions

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1

Access r r r r r r r

Flag VOUT IOUT/P

OUT X MFR PGOOD X X

Default Value 0 0 0 0 0 0 0

Bit Position 7 6 5 4 3 2 1

Access r r r r r r r

Flag X OFF VOUT_

IOUT_O

C VIN_UV TEMP CML

Default Value 0 X 0 0 0 0 0

7A STATUS_VOUT

Returns one byte of information with the status of the module’s output voltage related

faults

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r rrr r

Flag VOUT_OV X X VOUT_UV X X X X

Default Value 0 0 0 0 0 0 0 0

7B STATUS_IOUT

Returns one byte of information with the status of the module’s output current related

faults

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r

Flag IOUT_OC Fault X IOUT OC Warning X X X X X

Default Value 0 0 0 0 0 0 0 0

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Hex

Code Command Brief Description Non-Volatile

Memory Storage

7D STATUS_TEMPERATURE

Returns one byte of information with the status of the module’s temperature related

faults

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Flag OT_FAULT OT_WARN X X X X X X

Default Value 0 0 0 0 0 0 0 0

7E STATUS_CML

Returns one byte of information with the status of the module’s communication related

faults

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r

Flag Invalid

Command

Invalid

Data

PEC

Fail

Memory

fault

detected

X X

Other

Comm

Fault

Default Value 0 0 0 0 0 0 0 0

80 STATUS_MFR_SPECIFIC

Returns one byte of information with the status of the module specific faults or warning

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r rr R

Flag OTFI x X IVADDR X X X TWOPH_EN

Default Value 0 0 0 0 0 0 0 0

OTFI – Internal Temperature above Thermal Shutdown threshold

IVADDR – PMBUs address is not valid

TWOPH_EN – Module is in 2 phase mode

8B READ_VOUT

Returns the value of the output voltage of the module. Exponent is fixed at -9.

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mantissa

Default Value 0 0 0 0 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mantissa

Default Value 0 0 0 0 0 0 0 0

8C READ_IOUT

Returns the value of the output current of the module

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r R r r r

Function Exponent Mantissa

Default Value 1 1 1 0 0 V V V

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mantissa

Default Value V V V V V V V 0

V - Variable

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Table 6 (Continued)

Hex

Code Command Brief Description Non-Volatile

Memory Storage

8E READ_TEMPERATURE_2

Returns the value of the external temperature in degree Celsius

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r R r r r

Function Exponent Mantissa

Default Value 0 0 0 0 0 V V V

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mantissa

Default Value V V V V V V V 0

V - Variable

98 PMBUS_REVISION

Returns one byte indicating the module is compliant to PMBus Spec. 1.1 (read only)

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Default Value 0 0 0 1 0 0 0 1

D0 MFR_SPECIFIC_00

Returns module name information

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Reserved

Default Value 0 0 0 0 0 0 0 0

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Module Name Reserved

Default Value 0 1 0 1 0 1 1 0

YES

D4 VREF_TRIM

Applies a fixed offset to the reference voltage. Max trim range is -20% to +10% in 2mV

steps. Permissible values range between -120mV and +60mV. The offset is calculated

as VREF_TRIMx2-9. Exponent fixed at -9(dec)

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r/w r r rrrr r

Function Mantissa

Default Value V V V V V V V V

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value V V V V V V V V

YES

D5 STEP_VREF_MARGIN_HIGH

Applies a fixed offset to the reference voltage. Adjustment is 0% to +10% in 2mV steps.

Permissible values range between 0mV and +60mV. The offset is calculated as

(STEP_VREF_MARGIN_HIGH + VREF_TRIM)x2-9. Exponent fixed at -9(dec). Net output

voltage includes VREF_TRIM adjustment and ranges from -30% to 10%

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mantissa

Default Value V V V V V V V V

Bit Position 7 6 5 4 3 2 1 0

Access r r r r/w r/w r/w r/w r/w

Function Mantissa

Default Value V V V V V V V V

YES

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Table 6 (Continued)

Digital Power Insight (DPI)

GE offers a software tool that set helps users evaluate and simulate the PMBus performance of the PJT004 modules without

the need to write software.

The software can be downloaded for free at http://go.ge-energy.com/DigitalPowerInsight.html. A GE USB to I2C

adapter and associated cable set are required for proper functioning of the software suite. For first time users, the GE DPI

Evaluation Kit can be purchased from leading distributors at a nominal price and can be used across the entire range of GE

Digital POL Modules.

Hex

Code Command Brief Description

Non-Volatile

Memory

Storage

D6 STEP_VREF_MARGIN_LOW

Applies a fixed negative offset to the reference voltage. Adjustment is -20% to 0% in 2mV

steps. Permissible values range between -120mV and 0mV) The offset is calculated as

(STEP_VREF_MARGIN_LOW + VREF_TRIM)x2-9.Exponent fixed at -9(dec). Net output

voltage includes VREF_TRIM adjustment and ranges from -30% to 10%

Format Linear, two’s complement binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r rrrr r

Function Mantissa

Default Value V V V V V V V V

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w r/w r/w r/w r/w r/w

Function Mantissa

Default Value V V V V V V V V

YES

D7 PCT_VOUT_FAULT_PG_LIMIT

Single command to set PGOOD, VOUT_UNDER_VOLTAGE(UV) and

VOUT_OVER_VOLTAGE(OV) limits as percentage of nominal

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r/w r/w

Function X X X X X X

PCT_

MSB

PCT_

LSB

Default Value 0 X X X X X X 0

PAGE Command Truth Table

PCT_M

PCT_LS

UV (%) PGL

LOW

(%)

PGL

HIGH

(%)

PGH

HIGH

(%)

PGH

LOW

(%)

OV (%)

0 0 -16.67 -12.5 -8.33 12.5 8.33 16.67

0 1 -12.5 -8.33 -4.17 8.33 4.17 12.5

1 0 -29.17 -20.83 -16.67 8.33 4.17 12.5

1 1 -41.67 -37.5 -33.33 8.33 4.17 12.5

D8 SEQUENCE_TON_TOFF_DELAY

Used to set delay to turn-on or turn-off modules as a ratio of TON_RISE. Values can range

from 0 to 7 and are a multiple of TON_RISE TIME

Format Unsigned Binary

Bit Position 7 6 5 4 3 2 1 0

Access r/w r/w r/w rr/w r/w r/w r

Function TON_DELAY TOFF_DELAY

Default Value 0 0 0 0 0 0 0 0

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Thermal Considerations

Power modules operate in a variety of thermal

environments; however, sufficient cooling should always be

provided to help ensure reliable operation.

Considerations include ambient temperature, airflow,

module power dissipation, and the need for increased

reliability. A reduction in the operating temperature of the

module will result in an increase in reliability. The thermal

data presented here is based on physical measurements

taken in a wind tunnel. The test set-up is shown in Figure

48. The preferred airflow direction for the module is in

Figure 49.

flow

Power Module

ind Tunnel

PWBs

12.7_

(0.50)

76.2_

(3.0)

Probe Location

for measuring

airflow and

ambient

temperature

25.4_

(1.0)

Figure 48. Thermal Test Setup.

The thermal reference points, Tref used in the specifications

are also shown in Figure 49. For reliable operation the

temperatures at these points should not exceed 120oC. The

output power of the module should not exceed the rated

power of the module (Vo,set x Io,max).

Please refer to the Application Note “Thermal

Characterization Process For Open-Frame Board-Mounted

Power Modules” for a detailed discussion of thermal

aspects including maximum device temperatures.

Figure 49. Preferred airflow direction and location of hot-

spot of the module (Tref).

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Shock and Vibration

The ruggedized (-D version) of the modules are designed to withstand elevated levels of shock and vibration to be able to operate

in harsh environments. The ruggedized modules have been successfully tested to the following conditions:

Non operating random vibration:

Random vibration tests conducted at 25C, 10 to 2000Hz, for 30 minutes each level, starting from 30Grms (Z axis) and up to 50Grms

(Z axis). The units were then subjected to two more tests of 50Grms at 30 minutes each for a total of 90 minutes.

Operating shock to 40G per Mil Std. 810G, Method 516.4 Procedure I:

The modules were tested in opposing directions along each of three orthogonal axes, with waveform and amplitude of the shock

impulse characteristics as follows:

All shocks were half sine pulses, 11 milliseconds (ms) in duration in all 3 axes.

Units were tested to the Functional Shock Test of MIL-STD-810, Method 516.4, Procedure I - Figure 516.4-4. A shock magnitude of

40G was utilized. The operational units were subjected to three shocks in each direction along three axes for a total of eighteen

shocks.

Operating vibration per Mil Std 810G, Method 514.5 Procedure I:

The ruggedized (-D version) modules are designed and tested to vibration levels as outlined in MIL-STD-810G, Method 514.5, and

Procedure 1, using the Power Spectral Density (PSD) profiles as shown in Table 7 and Table 8 for all axes. Full compliance with

performance specifications was required during the performance test. No damage was allowed to the module and full compliance

to performance specifications was required when the endurance environment was removed. The module was tested per MIL-STD-

810, Method 514.5, Procedure I, for functional (performance) and endurance random vibration using the performance and

endurance levels shown in Table 7 and Table 8 for all axes. The performance test has been split, with one half accomplished before

the endurance test and one half after the endurance test (in each axis). The duration of the performance test was at least 16

minutes total per axis and at least 120 minutes total per axis for the endurance test. The endurance test period was 2 hours

minimum per axis.

Table 7: Performance Vibration Qualification - All Axes

Frequency (Hz) PSD Level

(G2/Hz) Frequency (Hz) PSD Level

(G2/Hz)

10 1.14E-03 170 2.54E-03 690 1.03E-03

30 5.96E-03 230 3.70E-03 800 7.29E-03

40 9.53E-04 290 7.99E-04 890 1.00E-03

50 2.08E-03 340 1.12E-02 1070 2.67E-03

90 2.08E-03 370 1.12E-02 1240 1.08E-03

110 7.05E-04 430 8.84E-04 1550 2.54E-03

130 5.00E-03 490 1.54E-03 1780 2.88E-03

140 8.20E-04 560 5.62E-04 2000 5.62E-04

Table 8: Endurance Vibration Qualification - All Axes

Frequency (Hz) PSD Level

(G2/Hz) Frequency (Hz) PSD Level

(G2/Hz)

10 0.00803 170 0.01795 690 0.00727

30 0.04216 230 0.02616 800 0.05155

40 0.00674 290 0.00565 890 0.00709

50 0.01468 340 0.07901 1070 0.01887

90 0.01468 370 0.07901 1240 0.00764

110 0.00498 430 0.00625 1550 0.01795

130 0.03536 490 0.01086 1780 0.02035

140 0.0058 560 0.00398 2000 0.00398

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 34

Example Application Circuit

Requirements:

Vin: 12V

Vout: 1.8V

Iout: 3A max., worst case load transient is from 2A to 3A

Vout: 1.5% of Vout (27mV) for worst case load transient

Vin, ripple 1.5% of Vin (180mV, p-p)

CI1 Decoupling cap - 1x0.047



F/16V ceramic(e.g. Murata LLL185R71C473MA01) + 1x0.1uF/16V 0402 ceramic

CI2 3x22



F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)

CI3 47



F/16V bulk electrolytic

CO1 Decoupling cap - 1x0.047



F/16V ceramic (e.g. Murata LLL185R71C473MA01) + 1x0.1uF/16V 0402 ceramic

CO2 5 x 47uF/6.3V 1210 ceramic capacitors

CO3 NA

CTune 3300 pF ceramic capacitor (can be 1206, 0805 or 0603 size)

RTune 300 SMT resistor (can be 1206, 0805 or 0603 size)

RTrim 10k



SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)

Note: The DATA, CLK and SMBALRT pins do not have any pull-up resistors inside the module. Typically, the SMBus master

controller will have the pull-up resistors as well as provide the driving source for these signals.

RADDR0

DATA

S-

RADDR1

GND

Vin+

CI3 CO3

DDR0

VOUT

S+

GND

TRIM

CTUNE

RTUNE

RTrim

VIN

CO1

CI1

Vout+

ON/OFF

SEQ

SMBALRT#

MODULE

PGOOD

ADDR1

SIG_GND

SYNC

CI2 CO2

CLK

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 35

Mechanical Outline

Dimensions are in millimeters and (inches).

Tolerances: x.x mm



0.5 mm (x.xx in.



0.02 in.) [unless otherwise indicated]

x.xx mm



0.25 mm (x.xxx in



0.010 in.)

PIN FUNCTION PIN FUNCTION

1 ON/OFF 10 PGOOD

2 VIN 11 SYNC

3 GND 12 VS-

4 VOUT 13 SIG_GND

5 VS+ (SENSE) 14 SMBALERT#

6 TRIM 15 DATA

7 GND 16 ADDR0

8 CLK 17 ADDR1

9 SEQ

12.2

(0.48)

If unused, connect to SIG_GND

12.2

(0.48)

7.5

(0.295)

MAX

DIMENSION IN INCHES

ONLY

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Recommended Pad Layout

Dimensions are in millimeters and (inches).

Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated]

x.xx mm  0.25 mm (x.xxx in  0.010 in.)

2 If unused, connect to SIG_GND.

PIN FUNCTION PIN FUNCTION

1 ON/OFF 10 PGOOD

2 VIN 11 SYNC2

3 GND 12 VS-

4 VOUT 13 SIG_GND

5 VS+ (SENSE) 14 SMBALERT#

6 TRIM 15 DATA

7 GND 16 ADDR0

8 CLK 17 ADDR1

9 SEQ

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Packaging Details

The 12V Digital PicoDLynxIITM 4A modules are supplied in tape & reel as standard. Modules are shipped in quantities of 200

modules per reel.

All Dimensions are in millimeters and (in inches).

Reel Dimensions:

Outside Dimensions: 330.2 mm (13.00)

Inside Dimensions: 177.8 mm (7.00”)

Tape Width: 24.00 mm (0.945”)

Data Sheet

4A Digital PicoDLynxII

: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

Page 38

Surface Mount Information

Pick and Place

The 4A Digital PicoDLynxII

modules use an open frame

construction and are designed for a fully automated

assembly process. The modules are fitted with a label

designed to provide a large surface area for pick and place

operations. The label meets all the requirements for surface

mount processing, as well as safety standards, and is able

to withstand reflow temperatures of up to 300

C. The label

also carries product information such as product code,

serial number and the location of manufacture.

Nozzle Recommendations

The module weight has been kept to a minimum by using

open frame construction. Variables such as nozzle size, tip

style, vacuum pressure and placement speed should be

considered to optimize this process. The minimum

recommended inside nozzle diameter for reliable operation

is 3mm. The maximum nozzle outer diameter, which will

safely fit within the allowable component spacing, is 7 mm.

Bottom Side / First Side Assembly

This module is not recommended for assembly on the

bottom side of a customer board. If such an assembly is

attempted, components may fall off the module during the

second reflow process.

Lead Free Soldering

The modules are lead-free (Pb-free) and RoHS compliant

and fully compatible in a Pb-free soldering process. Failure

to observe the instructions below may result in the failure of

or cause damage to the modules and can adversely affect

long-term reliability.

Pb-free Reflow Profile

Power Systems will comply with J-STD-020 Rev. C

(Moisture/Reflow Sensitivity Classification for Nonhermetic

Solid State Surface Mount Devices) for both Pb-free solder

profiles and MSL classification procedures. This standard

provides a recommended forced-air-convection reflow

profile based on the volume and thickness of the package

(table 4-2). The suggested Pb-free solder paste is Sn/Ag/Cu

(SAC). For questions regarding Land grid array(LGA)

soldering, solder volume; please contact GE for special

manufacturing process instructions. The recommended

linear reflow profile using Sn/Ag/Cu solder is shown in Fig.

44. Soldering outside of the recommended profile requires

testing to verify results and performance.

MSL Rating

The 4A Digital PicoDLynxII

modules have a MSL rating of

2A.

Storage and Handling

The recommended storage environment and handling

procedures for moisture-sensitive surface mount packages

is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping

and Use of Moisture/Reflow Sensitive Surface Mount

Devices). Moisture barrier bags (MBB) with desiccant are

required for MSL ratings of 2 or greater. These sealed

packages should not be broken until time of use. Once the

original package is broken, the floor life of the product at

conditions of



30°C and 60% relative humidity varies

according to the MSL rating (see J-STD-033A). The shelf life

for dry packed SMT packages will be a minimum of 12

months from the bag seal date, when stored at the following

conditions: < 40° C, < 90% relative humidity.

Figure 50. Recommended linear reflow profile using

Sn/Ag/Cu solder.

Post Solder Cleaning and Drying Considerations

Post solder cleaning is usually the final circuit-board

assembly process prior to electrical board testing. The result

of inadequate cleaning and drying can affect both the

reliability of a power module and the testability of the

finished circuit-board assembly. For guidance on

appropriate soldering, cleaning and drying procedures, refer

Board Mounted Power Modules: Soldering and Cleaning

Application Note (AN04-001).

Per J-STD-020 Rev. D

100

150

200

250

300

Reflow Time (Seconds)

Reflow Temp (°C)

Heating Zone

1°C/Second

Peak Temp 260°C

* Min. Time Above 235°C

15 Seconds

*Time Above 217°C

60 Seconds

Cooling

Zone

GE Data Sheet

4A Digital PicoDLynxIITM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 4A Output Current

For more information, call us at

USA/Canada:

+1 888 546 3243, or +1 972 244 9288

Asia-Pacific:

+86.021.54279977*808

Europe, Middle-East and Africa:

+49.89.878067-280

www.gecriticalpower.com

GE Critical Power reserves the right to make changes to the product(s) or information contained herein without notice, and no

liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s)

or information.

Ordering Information

Please contact your GE Sales Representative for pricing, availability and optional features.

Table 9. Device Codes

Device Code Input

Voltage Range

Output

Voltage

Output

Current

On/Off

Logic Sequencing Comcodes

PJT004A0X3-SRZ 4.5 – 14.4Vdc 0.51 – 5.5Vdc 4A Negative Yes 150052945

PJT004A0X43-SRZ 4.5 – 14.4Vdc 0.51 – 5.5Vdc 4A Positive Yes 150052969

PJT004A0X3-SRDZ 4.5 – 14.4Vdc 0.51 – 5.5Vdc 4A Negative Yes 150052970

PJT004A0X43-SRDZ 4.5 – 14.4Vdc 0.51 – 5.5Vdc 4A Positive Yes 150052971

-Z refers to RoHS compliant parts

Table 10. Coding Scheme

GE Digital Non-Isolated DC-DC products use technology licensed from Power-One, protected by US patents: US20040246754, US2004090219A1, US2004093533A1, US2004123164A1,

US2004123167A1, US2004178780A1, US2004179382A1, US20050200344, US20050223252, US2005289373A1, US20060061214, US2006015616A1, US20060174145, US20070226526,

US20070234095, US20070240000, US20080052551, US20080072080, US20080186006, US6741099, US6788036, US6936999, US6949916, US7000125, US7049798, US7068021, US7080265,

US7249267, US7266709, US7315156, US7372682, US7373527, US7394445, US7456617, US7459892, US7493504, US7526660.

Outside the US the Power-One licensed technology is protected by patents: AU3287379AA, AU3287437AA, AU3290643AA, AU3291357AA, CN10371856C, CN1045261OC, CN10458656C,

CN10459360C, CN10465848C, CN11069332A, CN11124619A, CN11346682A, CN1685299A, CN1685459A, CN1685582A, CN1685583A, CN1698023A, CN1802619A, EP1561156A1, EP1561268A2,

EP1576710A1, EP1576711A1, EP1604254A4, EP1604264A4, EP1714369A2, EP1745536A4, EP1769382A4, EP1899789A2, EP1984801A2, W004044718A1, W004045042A3, W004045042C1,

W004062061 A1, W004062062A1, W004070780A3, W004084390A3, W004084391A3, W005079227A3, W005081771A3, W006019569A3, W02007001584A3, W02007094935A3

Package

Identifier

Family Sequencing

Option

Output

current

Output

voltage

On/Off

logic

Remote

Sense Options

ROHS

Compliance

P J T 004A0 X 3 -SR -D Z

P=Pico

U=Pico

M=Mega

G=Giga

J=DLynx

II Digital

K =

DLynxII

Analog.

T=with EZ

Sequence

X=without

sequencing

4A X =

programm

able output

4 =

positive

No entry

negative

3 =

Remote

Sense

S =

Surface

Mount

R =

Tape &

Reel

D = 105°C

operating

ambient,

40G

operating

shock as

per MIL Std

810G

Z = ROHS6