PTH03060WAZT - Texas Instruments High-Performance Analog

For technical support and further information visit http://power.ti.com

SLTS215B – MAY 2003 – REVISED DECEMBER 2003

Standard Application

Features

•Up to 10-A Output Current

•3.3-V Input Voltage

•Wide-Output Voltage Adjust

(0.8 V to 2.5 V)

•Efficiencies up to 96 %

•114 W/in³ Power Density

•On/Off Inhibit

•Output Voltage Sense

•Pre-Bias Startup

•Margin Up/Down Controls

•Under-Voltage Lockout

•Auto-Track™ Sequencing

•Output Over-Current Protection

(Non-Latching, Auto-Reset)

•Operating Temp: –40 to +85 °C

•DSP Compatible Output Voltages

•Safety Agency Approvals:

UL 1950, CSA 22.2 950, EN60950

VDE (Pending)

•Point-of-Load Alliance (POLA)

Compatible

Description

The PTH03060W non-isolated power

module is small in size but big on per-

formance and flexibility. Its high output

current, compact footprint, and industry-

leading features offers system designers

a versatile module for powering complex

multi-processor digital systems.

This product employs double-sided

surface mount construction and provides

high-performance step-down power

conversion for up to 10 A of output cur-

rent from a 3.3-V input bus voltage.

The output voltage is adjustable and can

be set to any value over the range, 0.8 V to

2.5 V, using a single resistor.

This series includes Auto-Track™

Sequencing. Auto-Track simplifies the

task of supply voltage sequencing in a

power system by enabling modules to

track each other, or any external voltage,

during power up and power down.

Other operating features include an

on/off inhibit, margin up/down controls,

and the ability to start up into an existing

output voltage or prebias. To ensure tight

load regulation, an output voltage sense

is also provided. A non-latching over-

current trip serves as load fault protection.

Target applications include complex

multi-voltage, multi-processor systems

that incorporate the industry’s high-speed

DSPs, micro-processors and bus drivers.

Auto-Track™

Sequencing

Pin Configuration

Pin Function

1 GND

3 Inhibit *

o Adjust

o Sense

out

7 GND

8 Track

9 Margin Down *

10 Margin Up *

* Denotes negative logic:

Open = Normal operation

Ground = Function active

NOMINAL SIZE = 1 in x 0.62 in

(25,4 mm x 15,75 mm)

Margin Up

Margin Down

VIN

CIN

330 µF

(Required)

COUT

330 µF

(Optional)

Inhibit

GND GND

VOUT

Vo Sense

Track

RSET

1 %, 0.1 W

(Required)

PTH03060W

(Top View)

10 9 8 7

543

PTH03060W —3.3 V Input

10-A, 3.3-V Input Non-Isolated

Step-Down Switching Power Module

Rset = Required to set the output voltage to a value

higher than 0.8 V. (See spec. table for values)

Cin = Required 330 µF capacitor

Cout = Optional 330 µF capacitor

For technical support and further information visit http://power.ti.com

Pin Descriptions

Vin: The positive input voltage power node to the mod-

ule, which is referenced to common GND.

Vout: The regulated positive power output with respect

to the GND node.

GND: This is the common ground connection for the

Vin and Vout power connections. It is also the 0 VDC

reference for the control inputs.

Inhibit: The Inhibit pin is an open-collector/drain negative

logic input that is referenced to GND. Applying a low-

level ground signal to this input disables the module’s

output and turns off the output voltage. When the Inhibit

control is active, the input current drawn by the regula-

tor is significantly reduced. If the Inhibit pin is left

open-circuit, the module will produce an output when-

ever a valid input source is applied.

Vo Adjust: A 0.1 W 1 % resistor must be directly connected

between this pin and pin 7 (GND) to set the output voltage

to a value higher than 0.8 V. The temperature stability of

the resistor should be 100 ppm/°C (or better). The set

point range for the output voltage is from 0.8 V to 3.6 V.

The resistor value required for a given output voltage

may be calculated from the following formula. If left

open circuit, the output voltage will default to its lowest

value. For further information on output voltage adjust-

ment consult the related application note.

Rset = 10 kΩ 0.8 V – 2.49 kΩ

Vout – 0.8 V

The specification table gives the preferred resistor values

for a number of standard output voltages.

Vo Sense: The sense input allows the regulation circuit to

compensate for voltage drop between the module and

the load. For optimal voltage accuracy Vo Sense should

be connected to Vout. It can also be left disconnected.

Track: This is an analog control input that enables the

output voltage to follow an external voltage. This pin

becomes active typically 20 ms after the input voltage

has been applied, and allows direct control of the output

voltage from 0 V up to the nominal set-point voltage.

Within this range the output will follow the voltage at

the Track pin on a volt-for-volt basis. When the control

voltage is raised above this range, the module regulates

at its set-point voltage. The feature allows the output

voltage to rise simultaneously with other modules pow-

ered from the same input bus. If unused, this input should

be connected to Vin. Note: Due to the under-voltage lockout

feature, the output of the module cannot follow its own input

voltage during power up. For more information, consult the

related application note.

Margin Down: When this input is asserted to GND, the

output voltage is decreased by 5% from the nominal. The

input requires an open-collector (open-drain) interface.

It is not TTL compatible. A lower percent change can

be accomodated with a series resistor. If unused, this

input may be left unconnected. For further information,

consult the related application note.

Margin Up: When this input is asserted to GND, the out-

put voltage is increased by 5%. The input requires an

open-collector (open-drain) interface. It is not TTL

compatible. The percent change can be reduced with a

series resistor. If unused, this input may be left uncon-

nected. For further information, consult the related

application note.

Ordering Information

Package Options (PTH03060xHH)(1)

Code Description Pkg Ref.

(2)

AH Horiz. T/H (EUW)

AS SMD, Standard (3) (EUY)

Output Voltage (PTH03060Hxx)

Code Voltage

W 0.8 V – 2.5 V (Adjust)

Notes: (1) Add “T” to end of part number for tape and reel on SMD packages only.

(2) Reference the applicable package reference drawing for the dimensions and PC board layout

(3) “Standard” option specifies 63/37, Sn/Pb pin solder material.

10-A, 3.3-V Input Non-Isolated

Step-Down Switching Power Module

PTH03060W —3.3 V Input

SLTS215B – MAY 2003 – REVISED DECEMBER 2003

For technical support and further information visit http://power.ti.com

Environmental & Absolute Maximum Ratings (Voltages are with respect to GND)

Characteristics Symbols Conditions Min Typ Max Units

Track Input Voltage Vtrack –0.3 — Vin + 0.3 V

Operating Temperature Range T

aOver Vin Range –40 (i) — 85 °C

Solder Reflow Temperature Treflow Surface temperature of module body or pins 235 (ii) °C

Storage Temperature Ts— –40 — 125 °C

Mechanical Shock Per Mil-STD-883D, Method 2002.3 —500—G’s

1 msec, ½ Sine, mounted

Mechanical Vibration Mil-STD-883D, Method 2007.2 —20— G’s

20-2000 Hz

Weight — — 3.7 — grams

Flammability — Meets UL 94V-O

Notes: (i) For operation below 0 °C the external capacitors must bave stable characteristics. use either a low ESR tantalum, Os-Con, or ceramic capacitor.

(ii) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum.

PTH03060W —3.3 V Input

10-A, 3.3-V Input Non-Isolated

Step-Down Switching Power Module

SLTS215B – MAY 2003 – REVISED DECEMBER 2003

Specifications (Unless otherwise stated, Ta =25 °C, Vin =3.3 V, Vo =2 V, Cin =330 µF, Cout =0 µF, and Io =Iomax)

PTH03060W

Characteristics Symbols Conditions Min Typ Max Units

Output Current Io0.8 V ≤ Vo ≤ 2.5 V, 60 °C, 200 LFM airflow 0 — 10 (1) A

25 °C, natural convection 0 — 10 (1)

Input Voltage Range Vin Over Io range 2.95 (2) — 3.65 V

Set-Point Voltage Tolerance Vo tol — — ±2 (3) %Vo

Temperature Variation ∆Regtemp –40 °C <Ta < +85 °C — ±0.5 — %Vo

Line Regulation ∆Regline Over Vin range — ±10 — mV

Load Regulation ∆Regload Over Io range — ±12 — mV

Total Output Variation ∆Regtot Includes set-point, line, load, ——±3

(3) %Vo

–40 °C ≤ Ta ≤ +85 °C

Efficiency ηIo =7 A RSET = 2.21 kΩVo = 2.5 V — 93 —

RSET = 4.12 kΩVo = 2.0 V — 92 —

RSET = 5.49 kΩVo = 1.8 V — 91 — %

RSET = 8.87 kΩVo = 1.5 V — 89 —

RSET = 17.4 kΩVo = 1.2 V — 87 —

RSET = 36.5 kΩVo = 1.0 V — 85 —

Vo Ripple (pk-pk) Vr20 MHz bandwidth — 25 — mVpp

Over-Current Threshold Io trip Reset, followed by auto-recovery — 20 — A

Transient Response 1 A/µs load step, 50 to 100 % Iomax,

Cout =330 µF

ttr Recovery Time — 70 — µSec

∆Vtr Vo over/undershoot — 100 — mV

Margin Up/Down Adjust ∆Vo margin — ± 5 — %

Margin Input Current (pins 9 /10) IIL margin Pin to GND — – 8 (4) —µA

Track Input Current (pin 8) IIL track Pin to GND — — –130 (5) µA

Track Slew Rate Capability dVtrack/dt Cout ≤ Cout(max) — — 1 V/ms

Under-Voltage Lockout UVLO Vin increasing — 2.45 2.8 V

Vin decreasing 2.2 2.40 —

Inhibit Control (pin3) Referenced to GND

Input High Voltage VIH Vin –0.5 — Open (5) V

Input Low Voltage VIL –0.2 — 0.6

Input Low Current IIL inhibit Pin to GND — –130 — µA

Input Standby Current Iin inh Inhibit (pin 3) to GND, Track (pin 8) open — 10 — mA

Switching Frequency ƒsOver Vin and Io ranges 275 300 325 kHz

External Input Capacitance Cin 330 (6) ——µF

External Output Capacitance Cout Capacitance value non-ceramic 0 330 (7) 5,500 (8) µF

ceramic 0 — 300

Equiv. series resistance (non-ceramic) 4 (9) ——mΩ

Reliability MTBF Per Bellcore TR-332 5.7 — — 106 Hrs

50 % stress, Ta =40 °C, ground benign

Notes:

(1) See SOA curves or consult factory for appropriate derating.

(2) The minimum input voltage is equal to 2.95 V or Vout + 0.5 V, whichever is greater.

(3) The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a tolerance of 1 %

with 100 ppm/°C or better temperature stability.

(4) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.

(5) This control pin has an internal pull-up to the input voltage Vin. If it is left open-circuit the module will operate when input power is applied. A small

low-leakage (<100 nA) MOSFET is recommended for control. For further information, consult the related application note.

(6) A 330 µF input capacitor is required for proper operation. The capacitor must be rated for a minimum of 500 mA rms of ripple current.

(7) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response.

(8) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance.

(9) This is the typcial ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 m

Ω

as the minimum when using max-ESR values to calculate.

For technical support and further information visit http://power.ti.com

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.

Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to

modules soldered directly to a 4-layer PCB with 1 oz. copper.

Typical Characteristics

Characteristic Data; Vin =3.3 V (See Note A)

Efficiency vs Load Current

Power Dissipation vs Load Current

Output Ripple vs Load Current

Safe Operating Area; Vin =3.3 V (See Note B)

Output Voltage =2.5 V

Output Voltage =1.0 V

10-A, 3.3-V Input Non-Isolated

Step-Down Switching Power Module

PTH03060W —3.3 V Input

SLTS215B – MAY 2003 – REVISED DECEMBER 2003

100

0246810

Iout - Am

Efficiency - %

2.5 V

2.0 V

1.8 V

1.5 V

1.2 V

1.0 V

VOUT

0246810

Iout - Am

Ripple - mV

2.5 V

2.0 V

1.8 V

1.5 V

1.2 V

1.0 V

VOUT

0246810

Iout - Am

Pd - Watts

0246810

Iout

(

)

Ambient Temperature (°C)

400LFM

200LFM

100LFM

Nat Conv

Airflow

0246810

Iout

(

)

Ambient Temperature (°C)

400LFM

200LFM

100LFM

Nat Conv

Airflow

Application Notes

For technical support and further information visit http://power.ti.com

PTH03060W & PTH05060W

Capacitor Recommendations for the PTH03060 &

PTH05060 Series of Power Modules

Input Capacitor

The recommended input capacitor(s) is determined by

the 330 µF minimum capacitance and 500 mArms mini-

mum ripple current rating.

Ripple current, less than 150 mΩ equivalent series resis-

tance (ESR), and temperature are the major considerations

when selecting input capacitors. Unlike polymer tantalum,

regular tantalum capacitors have a recommended mini-

mum voltage rating of 2 × (maximum DC voltage + AC

ripple). This is standard practice to ensure reliability.

For improved ripple reduction on the input bus, ceramic

capacitors [1] may used to compliment electrolytic types

to achieve the minimum required capacitance.

Output Capacitors (Optional)

For applications with load transients (sudden changes in

load current), regulator response will benefit from an

external output capacitance. The recommended output

capacitance of 330 µF will allow the module to meet

its transient response specification (see product data sheet).

For most applications, a high quality computer-grade

aluminum electrolytic capacitor is adequate. These capaci-

tors provide decoupling over the frequency range, 2 kHz

to 150 kHz, and are suitable for ambient temperatures

above 0 °C. For operation below 0 °C tantalum, ceramic

or Os-Con type capacitors are recommended. When using

one or more non-ceramic capacitors, the calculated equiva-

lent ESR should be no lower than 4 mΩ (7 mΩ using the

manufacturer’s maximum ESR for a single capacitor). A

list of preferred low-ESR type capacitors are identified

in Table 2-1.

Ceramic Capacitors

Above 150 kHz the performance of aluminum electrolytic

capacitors is less effective. Multilayer ceramic capacitors

have very low ESR and a resonant frequency higher than

the bandwidth of the regulator. They can be used to reduce

the reflected ripple current at the input as well as improve

the transient response of the output. When used on the

output their combined ESR is not critical as long as the

total value of ceramic capacitance does not exceed 300 µF.

Also, to prevent the formation of local resonances, do not

place more than five identical ceramic capacitors in par-

allel with values of 10 µF or greater.

Tantalum Capacitors

Tantalum type capacitors can be used at both the input

and output, and are recommended for applications where

the ambient operating temperature can be less than 0 °C.

The AVX TPS, Sprague 593D/594/595 and Kemet T495/

T510 capacitor series are suggested over many other

tantalum types due to their higher rated surge, power

dissipation, and ripple current capability. As a caution

many general purpose tantalum capacitors have consid-

erably higher ESR, reduced power dissipation and lower

ripple current capability. These capacitors are also less

reliable as they have lower power dissipation and surge

current ratings. Tantalum capacitors that do not have a

stated ESR or surge current rating are not recommended

for power applications.

When specifying Os-Con and polymer tantalum capacitors

for the output, the minimum ESR limit will be encoun-

tered well before the maximum capacitance value is

reached.

Capacitor Table

Table 2-1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

(rms) ratings. The recommended number of capacitors

required at both the input and output buses is identified

for each capacitor type.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those

listed are for guidance. The RMS ripple current rating and

ESR (at 100 kHz) are critical parameters necessary to insure

both optimum regulator performance and long capacitor life.

Designing for Very Fast Load Transients

The transient response of the DC/DC converter has been

characterized using a load transient with a di/dt of 1 A/µs.

The typical voltage deviation for this load transient is

given in the data sheet specification table using the

optional value of output capacitance. As the di/dt of a

transient is increased, the response of a converter’s regu-

lation circuit ultimately depends on its output capacitor

decoupling network. This is an inherent limitation with

any DC/DC converter once the speed of the transient

exceeds its bandwidth capability. If the target application

specifies a higher di/dt or lower voltage deviation, the

requirement can only be met with additional output

capacitor decoupling. In these cases special attention

must be paid to the type, value and ESR of the capacitors

selected.

If the transient performance requirements exceed that

specified in the data sheet, or the total amount of load

capacitance is above 3,000 µF, the selection of output

capacitors becomes more important. For further guidance

consult the separate application note, “Selecting Output

Capacitors for PTH Products in High-Performance Applica-

tions.”

Application Notes

For technical support and further information visit http://power.ti.com

PTH03060W & PTH05060W

Table 2-1: Input/Output Capacitors

epyT,rodneVroticapaC

)elytS(seireS

scitsiretcarahCroticapaCytitnauQ

gnikroW

egatloV

)Fµ(eulaVRSE.xaM

zHk001ta

elppiR.xaM

C°58tatnerruC

)smrI(

eziSlacisyhP

)mm(

tupnI

suB

tuptuO

suB

rebmuNtraProdneV

munimulA,cinosanaP

)laidaR(CF

)DMS(KF

CF( DMS)

V01

V52

V61

033

074

033

711.0 Ω

080.0 Ω

051.0 Ω

Am555

Am058

Am076

8×01

01 ×2.01

133A1CFUEE

P174E1KFVEE

P133C1CFVEE

detinUnoc-imehC

)DMS(munimulA-yloP,AXP

)laidaR(munimulA-yloP,SP

)laidaR(noc-sO,XF

)laidaR(munimulA,ZXL

V01

V3.6

V01

V61

033

093

033

420.0 Ω

210.0 Ω

810.0 Ω

021.0 Ω

Am0773

Am0774

Am0173

Am555

01 ×7.7

8×5.11

8×5.01

8×5.21

≤4

≤2

≤3

PT08JM133CV01AXP

11HM093SP6

M093XF01

LL21X8M133BV61ZXL

munimulA,nocihciN

)DMS(GW

)llaidaR(DH

)laidaR(MP

V52

V61

033

051.0 Ω

270.0 Ω

021.0 Ω

Am076

Am067

Am526

01 ×01

8×5.11

01 ×5.21

SG1RNM133E1GWU

RPM133A1DHU

6HPM133C1MPU

:munimulA-yloP,cinosanaP

)DMS(AW

)DMS(ES/S

V01

V3.6

033

081

220.0 Ω

500.0 ΩAm0054

Am0004

01 ×2.01

3.7 ×3.4 ×2.4

2≤4

≤1

P133A1AWFEE

R181J0ESFEE

oynaS

)laidaR(noc-sO,PS

(,PVSDMS)

)DMS(pacsoP,EPT

V01

V3.6

074

033

510.0 Ω

710.0 Ω

520.0 Ω

Am0054

Am0593

Am0042

01 ×5.01

8×21

3.7 ×3.4

≤2

≤3

≤4

M074PS01

M033PVS01

LM033EPT6

(SPTmulatnaT,XVASMD)

V01

033

540.0 Ω

060.0 ΩAm3271

Am6281

L3.7

×W7.5

×H1.4

1≤5

≤5

5400R010M733ESPT

0600R010M733VSPT

mulatnaT-yloP,temeK

)DMS(,025T

)DMS(.035T V01

V01

033

040.0 Ω

510.0 ΩAm0081

Am0083>

W3.4

×L3.7

×H0.4

SA010M733X025T

SA010M733X035T

eugarpS-yahsiV

)DMS(mulatnaT,D595

)DMS(mulatnaT,D495

)laidaR(munimulA-yloPAS49

V01

V3.6

033

001.0 Ω

540.0 Ω

520.0 Ω

Am0401

Am0632

Am0053

L2.7

×W6 ×H1.4

01 ×5.01

≤5

≤4

T2D0100X733D595

T2R6100X733D495

PBF3R60X733AS49

)DMS(R5XcimareC,temeKV61

V3.6

200.0 Ω—esac0121

mm5223

1≤5

≤5

CAP4M601C0121C

CAP9K674C0121C

cimareC,ataruMR5X)DMS(V3.6

V3.6

V61

001

200.0 Ω—esac0121

mm5223

]1[

3≤

≤5

M701J06RE23MRG

M674J06RE23MRG

K622C16RE23MRG

K601C16RD23MRG

cimareC,KDTR5X)DMS(V3.6

V3.6

V61

001

200.0 Ω—esac0121

mm5223

]1[

3≤

≤5

TM701J0R5X5223C

TM674J0R5X5223C

TM622C1R5X5223C

TM601C1R5X5223C

[1] A ceramic capacitor may be used to compliment electrolytic types at the input to further reduce high-frequency ripple current.

Application Notes

For technical support and further information visit http://power.ti.com

Adjusting the Output Voltage of the PTH03060W &

PTH05060W Wide-Output Adjust Power Modules

The Vo Adjust control (pin 4) sets the output voltage of the

PTH03060W and PTH05060W products to a value higher

than 0.8 V. The adjustment range of the PT03060W

(3.3-V input) is from 0.8 V to 2.5 V 1, and the PTH05060W

(5-V input) from 0.8 V to 3.6 V. For an output voltage

other than 0.8 V a single external resistor, Rset, must be

connected directly between the Vo Adjust and GND pins 2.

Table 1-1 gives the preferred value of the external resistor

for a number of standard voltages, along with the actual

output voltage that this resistance value provides.

For other output voltages the value of the required resistor

can either be calculated using the following formula, or

simply selected from the range of values given in Table 1-2.

Figure 1-1 shows the placement of the required resistor.

Rset = 10 kΩ · 0.8 V – 2.49 kΩ

Vout – 0.8 V

Figure 1-1; Vo Adjust Resistor Placement

Notes:

1. Modules that operate from a 3.3-V input bus should

not be adjusted higher than 2.5 V.

2. Use a 0.1 W resistor. The tolerance should be 1 %, with

temperature stability of 100 ppm/°C (or better). Place

the resistor as close to the regulator as possible. Connect

the resistor directly between pins 4 and 7 using dedicated

PCB traces.

3. Never connect capacitors from V

Adjust to either GND or

out

. Any capacitance added to the V

Adjust pin will affect

the stability of the regulator.

0.800 Open

0.825 318 kΩ

0.850 158 kΩ

0.875 104 kΩ

0.900 77.5 kΩ

0.925 61.5 kΩ

0.950 50.8 kΩ

0.975 43.2 kΩ

1.000 37.5 kΩ

1.025 33.1 kΩ

1.050 29.5 kΩ

1.075 26.6 kΩ

1.100 24.2 kΩ

1.125 22.1 kΩ

1.150 20.4 kΩ

1.175 18.8 kΩ

1.200 17.5 kΩ

1.225 16.3 kΩ

1.250 15.3 kΩ

1.275 14.4 kΩ

1.300 13.5 kΩ

1.325 12.7 kΩ

1.350 12.1 kΩ

1.375 11.4 kΩ

1.400 10.8 kΩ

1.425 10.3 kΩ

1.450 9.82 kΩ

1.475 9.36 kΩ

1.50 8.94 kΩ

1.55 8.18 kΩ

1.60 7.51 kΩ

1.65 6.92 kΩ

1.70 6.4 kΩ

1.75 5.93 kΩ

1.80 5.51 kΩ

1.85 5.13 kΩ

1.90 4.78 kΩ

1.95 4.47 kΩ

Vout (Standard) Rset (Pref’d Value) Vout (Actual)

3.3 V 1698 Ω3.309V

2.5 V 2.21 kΩ2.502 V

2 V 4.12 kΩ2.010 V

1.8 V 5.49 kΩ1.803 V

1.5 V 8.87 kΩ1.504 V

1.2 V 17.4 kΩ1.202 V

1 V 36.5 kΩ1.005 V

0.8 V Open 0.8 V

Table 1-1; Preferred Values of Rset for Standard Output Voltages

PTH03060W & PTH05060W

Table 1-2; Output Voltage Set-Point Resistor Values

Va Req’dR

set Va Req’dR

set

2.00 4.18 kΩ

2.05 3.91 kΩ

2.10 3.66 kΩ

2.15 3.44 kΩ

2.20 3.22 kΩ

2.25 3.03 kΩ

2.30 2.84 kΩ

2.35 2.67 kΩ

2.40 2.51 kΩ

2.45 2.36 kΩ

2.50 2.22 kΩ

2.55 2.08 kΩ

2.60 1.95 kΩ

2.65 1.83 kΩ

2.70 1.72 kΩ

2.75 1.61 kΩ

2.80 1.51 kΩ

2.85 1.41 kΩ

2.90 1.32 kΩ

2.95 1.23 kΩ

3.00 1.15 kΩ

3.05 1.07 kΩ

3.10 988 Ω

3.15 914 Ω

3.20 843 Ω

3.25 775 Ω

3.30 710 Ω

3.35 647 Ω

3.40 587 Ω

3.45 529 Ω

3.50 473 Ω

3.55 419 Ω

3.60 367 Ω

330 µF

(Required)

OUT

330 µF

(Optional)

GND

OUT

Sense

SET

0.1 W

1 %

PTH05060W

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Features of the PTH Family of Non-Isolated

Wide Output Adjust Power Modules

Point-of-Load Alliance

The PTH family of non-isolated, wide-output adjust

power modules from Texas Instruments are optimized

for applications that require a flexible, high performance

module that is small in size. These products are part of

the “Point-of-Load Alliance” (POLA), which ensures

compatible footprint, interoperability and true second

sourcing for customer design flexibility. The POLA is a

collaboration between Texas Instruments, Artesyn Tech-

nologies, and Astec Power to offer customers advanced

non-isolated modules that provide the same functionality

and form factor. Product series covered by the alliance

includes the PTHxx050W (6 A), PTHxx060W (10 A),

PTHxx010W (15/12 A), PTHxx020W (22/18 A), and

the PTHxx030W (30/26 A).

From the basic, “Just Plug it In” functionality of the 6-A

modules, to the 30-A rated feature-rich PTHxx030W,

these products were designed to be very flexible, yet simple

to use. The features vary with each product. Table 3-1

provides a quick reference to the available features by

product and input bus voltage.

Table 3-1; Operating Features by Series and Input Bus Voltage

For simple point-of-use applications, the PTHxx050W

provides operating features such as an on/off inhibit,

output voltage trim, pre-bias startup (3.3/5-V input only),

and over-current protection. The PTHxx060W (10 A),

and PTHxx010W (15/12 A) include an output voltage

sense, and margin up/down controls. Then the higher

output current, PTHxx020W and PTHxx030W products

incorporate over-temperature shutdown protection. All

of the products referenced in Table 3-1 include Auto-

Track™. This is a feature unique to the PTH family,

and was specifically designed to simplify the task of se-

quencing the supply voltage in a power system. These

and other features are described in the following sections.

Soft-Start Power Up

The Auto-Track feature allows the power-up of multiple

PTH modules to be directly controlled from the Track

pin. However in a stand-alone configuration, or when

the Auto-Track feature is not being used, the Track pin

should be directly connected to the input voltage, Vin

(see Figure 3-1).

Figure 3–1

5 V

1,000 µF

OUT

330 µF

GND GND

3.3 V

SET

, 698Ω

0.1 W, 1 %

PTH05020W

Track

GNDInhibit 1

Up Dn Sense

Adjust

When the Track pin is connected to the input voltage the

Auto-Track function is permanently disengaged. This

allows the module to power up entirely under the control

of its internal soft-start circuitry. When power up is under

soft-start control, the output voltage rises to the set-point

at a quicker and more linear rate.

Figure 3–2

Vin (1 V/Div)

Vout (1 V/Div)

Iin (5 A/Div)

HORIZ SCALE: 5 ms/Div

Series Input Bus I OUT

3.3 V / 5 V 6 A •••••

12 V 6 A ••• •

3.3 V / 5 V 10 A •••••••

12 V 8 A ••• •••

3.3 V / 5 V 15 A •••••••

12 V 12 A ••• •••

3.3 V / 5 V 22 A ••••••••

12 V 18 A ••• ••••

3.3 V / 5 V 30 A ••••••••

12 V 26 A ••••••••

Over-Current

Output Sense

Adjust (Trim)

Thermal Shutdown

Pre-Bias Startup

Margin Up/Down

Auto-Track™

PTHxx030

On/Off Inhibit

PTHxx010

PTHxx020

PTHxx060

PTHxx050

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Output On/Off Inhibit

For applications requiring output voltage on/off control,

each series of the PTH family incorporates an output

Inhibit control pin. The inhibit feature can be used wher-

ever there is a requirement for the output voltage from

the regulator to be turned off.

Vo (2V/Div)

Iin (2A/Div)

Q1Vds (5V/Div)

HORIZ SCALE: 10ms/Div

PTH05020W

VIN

CIN

1,000 µF

COUT

330 µF

1 =Inhibit

GND GND

VOUT

Sense

BSS138

RSET

From the moment a valid input voltage is applied, the

soft-start control introduces a short time delay (typically

5 ms-10 ms) before allowing the output voltage to rise.

The output then progressively rises to the module’s set-

point voltage. Figure 3-2 shows the soft-start power-up

characteristic of the 22-A output product (PTH05020W),

operating from a 5-V input bus and configured for a 3.3-V

output. The waveforms were measured with a 5-A resistive

load, with Auto-Track disabled. The initial rise in input

current when the input voltage first starts to rise is the

charge current drawn by the input capacitors. Power-up

is complete within 15 ms.

Over-Current Protection

For protection against load faults, all modules incorporate

output over-current protection. Applying a load that

exceeds the regulator’s over-current threshold will cause

the regulated output to shut down. Following shutdown

a module will periodically attempt to recover by initiating

a soft-start power-up. This is described as a “hiccup” mode

of operation, whereby the module continues in a cycle of

successive shutdown and power up until the load fault is

removed. During this period, the average current flowing

into the fault is significantly reduced. Once the fault is

removed, the module automatically recovers and returns

to normal operation.

Over-Temperature Protection

The PTHxx020 and PTHxx030 series of products have

over-temperature protection. These products have an

on-board temperature sensor that protects the module’s

internal circuitry against excessively high temperatures.

A rise in the internal temperature may be the result of a

drop in airflow, or a high ambient temperature. If the

internal temperature exceeds the OTP threshold, the

module’s Inhibit control is automatically pulled low. This

turns the output off. The output voltage will drop as the

external output capacitors are discharged by the load

circuit. The recovery is automatic, and begins with a

soft-start power up. It occurs when the the sensed tem-

perature decreases by about 10 °C below the trip point.

Note: The over-temperature protection is a last resort mecha-

nism to prevent thermal stress to the regulator. Operation at

or close to the thermal shutdown temperature is not recom-

mended and will reduce the long-term reliability of the module.

Always operate the regulator within the specified Safe Operating

Area (SOA) limits for the worst-case conditions of ambient

temperature and airflow.

Turning Q1 on applies a low voltage to the Inhibit control

and disables the output of the module. If Q1 is then turned

off, the module will execute a soft-start power-up. A

regulated output voltage is produced within 20 msec.

Figure 3-4 shows the typical rise in both the output volt-

age and input current, following the turn-off of Q1. The

turn off of Q1 corresponds to the rise in the waveform,

Q1 Vds. The waveforms were measured with a 5-A load.

Figure 3–4

The power modules function normally when the Inhibit

pin is left open-circuit, providing a regulated output

whenever a valid source voltage is connected to Vin with

respect to GND.

Figure 3-3 shows the typical application of the inhibit

function. Note the discrete transistor (Q1). The Inhibit

control has its own internal pull-up to Vin potential. The

input is not compatible with TTL logic devices. An open-

collector (or open-drain) discrete transistor is recommended

for control.

Figure 3–3

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Auto-Track™ Function

The Auto-Track function is unique to the PTH family,

and is available with the all “Point-of-Load Alliance”

(POLA) products. Auto-Track was designed to simplify

the amount of circuitry required to make the output

voltage from each module power up and power down in

sequence. The sequencing of two or more supply voltages

during power up is a common requirement for complex

mixed-signal applications, that use dual-voltage VLSI ICs

such as DSPs, micro-processors, and ASICs.

How Auto-Track Works

Auto-Track works by forcing the module’s output voltage

to follow a voltage presented at the Track control pin. This

control range is limited to between 0 V and the module’s

set-point voltage. Once the track-pin voltage is raised

above the set-point voltage, the module’s output remains

at its set-point 1. As an example, if the Track pin of a 2.5-V

regulator is at 1 V, the regulated output will be 1 V. But

if the voltage at the Track pin rises to 3 V, the regulated

output will not go higher than 2.5 V.

When under track control, the regulated output from

the module follows the voltage at its Track pin on a volt-

for-volt basis. By connecting the Track pin of a number

of these modules together, the output voltages will fol-

low a common signal during power-up and power-down.

The control signal can be an externally generated master

ramp waveform, or the output voltage from another power

supply circuit 3. For convenience the Track control incor-

porates an internal RC charge circuit. This operates off

the module’s input voltage to provide a suitable rising

voltage ramp waveform.

Typical Application

The basic implementation of Auto-Track allows for

simultaneous voltage sequencing of a number of Auto-

Track compliant modules. Connecting the Track control

pins of two or more modules forces the Track control of

all modules to follow the same collective RC ramp wave-

form, and allows them to be controlled through a single

transistor or switch; Q1 in Figure 3-5.

To initiate a power-up sequence the Track control must

first pulled to ground potential. This should be done at

or before input power is applied to the modules, and then

held for at least 10 ms thereafter. This brief period gives

the modules time to complete their internal soft-start

initialization, which enables them to produce an output

voltage.

Applying a logic-level high signal to the circuit’s On/Off

Control turns Q1 on and applies a ground signal to the

Track control. After completing their internal soft-start

intialization, the output of all modules will remain at zero

volts while Q1 is on. 10 ms after a valid input voltage has

been applied to all modules, Q1 can be turned off. This

allows the track control voltage to automatically rise

toward to the modules' input voltage. During this period

the output voltage of each module will rise in unison with

other modules, to its respective set-point voltage.

Figure 3-6 shows the output voltage waveforms from the

circuit of Figure 3-5 after the On/Off Control is set from a

high to a low-level voltage. The waveforms, Vo1 and Vo2

represent the output voltages from the two power mod-

ules, U1 (3.3 V) and U2 (1.8 V) respectively. Vo1 and Vo2

are shown rising together to produce the desired simul-

taneous power-up characteristic.

The same circuit also provides a power-down sequence.

Power down is the reverse of power up, and is accom-

plished by lowering the track control voltage back to zero

volts. The important constraint is that a valid input voltage

must be maintained until the power down is complete. It

also requires that Q1 be turned off relatively slowly. This

is so that the Track control voltage does not fall faster than

Auto-Track's slew rate capability, which is 1 V/ms. The

components R1 and C1 in Figure 3-5 limit the rate at

which Q1 can pull down the Track control voltage. The

values of 100 k-ohm and 0.1 µF correlate to a decay rate

of about 0.17 V/ms.

The power-down sequence is initiated with a low-to-high

transition at the On/Off Control input to the circuit.

Figure 3-7 shows the power-down waveforms. As the

Track control voltage falls below the nominal set-point

voltage of each power module, then its output voltage

decays with all the other modules under Auto-Track

control.

Notes on Use of Auto-Track™

1. The Track pin voltage must be allowed to rise above

the module’s set-point voltage before the module can

regulate at its adjusted set-point voltage.

2. The Auto-Track function will track almost any voltage

ramp during power up, and is compatible with ramp

speeds of up to 1 V/ms.

3. The absolute maximum voltage that may be applied to the

Track pin is Vin.

4. The module will not follow a voltage at its Track control

input until it has completed its soft-start initialization.

This takes about 10 ms from the time that the module

has sensed that a valid voltage has been applied its input.

During this period, it is recommended that the Track

pin be held at ground potential.

5. The module is capable of both sinking and sourcing

current when following a voltage at its Track pin.

Therefore startup into an output prebias is not supported

during Auto-Track control. Note: A pre-bias holdoff is

not necessary when all supply voltages rise simultaneously

under the control of Auto-Track.

6. The Auto-Track function can be disabled by connecting

the Track pin to the input voltage (Vin). With Auto-Track

disabled, the output voltage will rise at a quicker and

more linear rate after input power is applied.

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Figure 3–6; Simultaneous Power Up with Auto-Track Control

PTH05010W

Track

GNDInhibit

PTH05020W

Track

GNDInhibit 7

OUT

=1.8 V

=3.3 V

+5 V

0 V

On/Off Control

1 = Power Down

0 = Power Up

BSS138

0.1 µF

100 k

698

5k49

Figure 3–5; Sequenced Power Up & Power Down Using Auto-Track

Figure 3–7; Simultaneous Power Down with Auto-Track Control

Vo1 (1 V/Div)

Vo2 (1 V/Div)

On/Off Input

(5 V/Div)

HORIZ SCALE: 10 ms/Div

Vo1 (1 V/Div)

Vo2 (1 V/Div)

On/Off Input

(5 V/Div)

HORIZ SCALE: 10 ms/Div

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Margin Up/Down Controls

The PTHxx060W, PTHxx010W, PTHxx020W, and

PTHxx030W products incorporate Margin Up and Margin

Down control inputs. These controls allow the output

voltage to be momentarily adjusted 1, either up or down,

by a nominal 5 %. This provides a convenient method

for dynamically testing the operation of the load circuit

over its supply margin or range. It can also be used to verify

the function of supply voltage supervisors. The ±5 %

change is applied to the adjusted output voltage, as set by

the external resistor, Rset at the Vo Adjust pin.

The 5 % adjustment is made by pulling the appropriate

margin control input directly to the GND terminal 2.

A low-leakage open-drain device, such as an n-channel

MOSFET or p-channel JFET is recommended for this

purpose 3. Adjustments of less than 5 % can also be accom-

modated by adding series resistors to the control inputs.

The value of the resistor can be selected from Table 3-2,

or calculated using the following formula.

Up/Down Adjust Resistance Calculation

To reduce the margin adjustment to something less than

5 %, series resistors are required (See RD and RU in

Figure 3-8). For the same amount of adjustment, the

resistor value calculated for RU and RD will be the same.

The formulas is as follows.

RU or RD= 499 – 99.8 kΩ

∆%

Where ∆% = The desired amount of margin adjust in

percent.

Notes:

1. The Margin Up* and Margin Dn* controls were not

intended to be activated simultaneously. If they are

their affects on the output voltage may not completely

cancel, resulting in the possibility of a slightly higher

error in the output voltage set point.

2. The ground reference should be a direct connection to

the module GND at pin 7 (pin 1 for the PTHxx050).

This will produce a more accurate adjustment at the

load circuit terminals. The transistors Q1 and Q2 should

be located close to the regulator.

3. The Margin Up and Margin Dn control inputs are not

compatible with devices that source voltage. This includes

TTL logic. These are analog inputs and should only be

controlled with a true open-drain device (preferably

a discrete MOSFET transistor). The device selected

should have low off-state leakage current. Each input

sources 8 µA when grounded, and has an open-circuit

voltage of 0.8 V.

Figure 3–8; Margin Up/Down Application Schematic

Table 3-2; Margin Up/Down Resistor Values

% Adjust RU / RD

5 0.0 kΩ

4 24.9 kΩ

3 66.5 kΩ

2 150.0 kΩ

1 397.0 kΩ

out

GND

MargDn

OUT

MargUp

PTH05010W

(

Top View

)

10 9 8 7

543

GND

SET

0.1 W, 1 %

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Pre-Bias Startup Capability

Only selected products in the PTH family incorporate this

capability. Consult Table 3-1 to identify which products

are compliant.

A pre-bias startup condition occurs as a result of an external

voltage being present at the output of a power module prior

to its output becoming active. This often occurs in com-

plex digital systems when current from another power

source is backfed through a dual-supply logic component,

such as an FPGA or ASIC. Another path might be via

clamp diodes as part of a dual-supply power-up sequencing

arrangement. A prebias can cause problems with power

modules that incorporate synchronous rectifiers. This is

because under most operating conditions, these types of

modules can sink as well as source output current.

The PTH family of power modules incorporate synchro-

nous rectifiers, but will not sink current during startup 1,

or whenever the Inhibit pin is held low. However, to ensure

satisfactory operation of this function, certain conditions

must be maintained. 2 Figure 3-9 shows an application

demonstrating the pre-bias startup capability. The start-

up waveforms are shown in Figure 3-10. Note that the

output current from the PTH03010W (Io) shows negli-

gible current until its output voltage rises above that

backfed through diodes D1 and D2.

Note: The pre-bias start-up feature is not compatible with

Auto-Track. When the module is under Auto-Track control,

it will sink current if the output voltage is below that of a

back-feeding source. To ensure a pre-bias hold-off one of two

approaches must be followed when input power is applied to

the module. The Auto-Track function must either be disabled 3,

or the module’s output held off (for at least 50 ms) using the

Inhibit pin. Either approach ensures that the Track pin volt-

age is above the set-point voltage at start up.

Notes

1. Startup includes the short delay (approx. 10 ms) prior

to the output voltage rising, followed by the rise of the

output voltage under the module’s internal soft-start

control. Startup is complete when the output voltage

has risen to either the set-point voltage or the voltage

at the Track pin, whichever is lowest.

2. To ensure that the regulator does not sink current when

power is first applied (even with a ground signal applied

to the Inhibit control pin), the input voltage must always

be greater than the output voltage throughout the

power-up and power-down sequence.

3. The Auto-Track function can be disabled at power up

by immediately applying a voltage to the module’s Track

pin that is greater than its set-point voltage. This can

be easily accomplished by connecting the Track pin to

Vin.

Vo = 2.5 V

VIN = 3.3 V

2k21

ASIC

VCORE VCCIO

PTH03010W

Track

GNDInhibit 7Vadj

Sense

CIN

330 µF

+COUT

330 µF

Figure 3–9; Application Circuit Demonstrating Pre-Bias Startup

Vin (1 V/Div)

Vo (1 V/Div)

Io (5 A/Div)

HORIZ SCALE: 5 ms/Div

Figure 3–10; Pre-Bias Startup Waveforms

Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Remote Sense

The PTHxx060W, PTHxx010W, PTHxx020W, and

PTHxx030W products incorporate an output voltage

sense pin, Vo Sense. The Vo Sense pin should be connected

to Vout at the load circuit (see data sheet standard appli-

cation). A remote sense improves the load regulation

performance of the module by allowing it to compensate

for any ‘IR’ voltage drop between itself and the load. An

IR drop is caused by the high output current flowing

through the small amount of pin and trace resistance.

Use of the remote sense is optional. If not used, the

Vo Sense pin can be left open-circuit. An internal low-

value resistor (15-Ω or less) is connected between the

Vo Sense and Vout. This ensures the output voltage remains

in regulation.

With the sense pin connected, the difference between

the voltage measured directly between the Vout and GND

pins, and that measured from Vo Sense to GND, is the

amount of IR drop being compensated by the regulator.

This should be limited to a maximum of 0.3 V.

Note: The remote sense feature is not designed to compensate

for the forward drop of non-linear or frequency dependent

components that may be placed in series with the converter

output. Examples include OR-ing diodes, filter inductors,

ferrite beads, and fuses. When these components are enclosed

by the remote sense connection they are effectively placed

inside the regulation control loop, which can adversely affect

the stability of the regulator.

PACKAGE OPTION ADDENDUM

www.ti.com 13-Nov-2010

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status (1) Package Type Package

Drawing Pins Package Qty Eco Plan (2) Lead/

Ball Finish MSL Peak Temp (3) Samples

(Requires Login)

PTH03060WAD ACTIVE Through-

Hole Module EUW 10 36 Pb-Free (RoHS) SN N / A for Pkg Type Purchase Samples

PTH03060WAH ACTIVE Through-

Hole Module EUW 10 36 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples

PTH03060WAS ACTIVE Surface

Mount Module EUY 10 36 TBD SNPB Level-1-235C-UNLIM/

Level-3-260C-168HRS Request Free Samples

PTH03060WAST ACTIVE Surface

Mount Module EUY 10 250 TBD SNPB Level-1-235C-UNLIM/

Level-3-260C-168HRS Purchase Samples

PTH03060WAZ ACTIVE Surface

Mount Module EUY 10 36 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Request Free Samples

PTH03060WAZT ACTIVE Surface

Mount Module EUY 10 250 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Purchase Samples

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

PACKAGE OPTION ADDENDUM

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Addendum-Page 2

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

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Peripherals

Clocks and Timers www.ti.com/clocks Consumer Electronics www.ti.com/consumer-apps

Interface interface.ti.com Energy www.ti.com/energy

Logic logic.ti.com Industrial www.ti.com/industrial

Power Mgmt power.ti.com Medical www.ti.com/medical

Microcontrollers microcontroller.ti.com Security www.ti.com/security

RFID www.ti-rfid.com Space, Avionics & www.ti.com/space-avionics-defense

Defense

RF/IF and ZigBee® Solutions www.ti.com/lprf Video and Imaging www.ti.com/video

Wireless www.ti.com/wireless-apps

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265