DC1385A - ANALOG DEVICES - Datasheet.Live

LTM4614

4614fb

Typical applicaTion

FeaTures

applicaTions

DescripTion

Dual 4A per Channel

Low VIN DC/DC

µModule Regulator

The LT M

4614 is a complete 4A dual output switching mode

step-down µModule

regulator. Included in the package

are the switching controllers, power FETs, inductors and

all support components. The dual 4A DC/DC converters

operate over an input voltage range of 2.375V to 5.5V.

The LTM4614 supports output voltages ranging from

0.8V to 5V. The regulator output voltages are set by a

single resistor for each output. Only bulk input and output

capacitors are needed to complete the design.

The low profile package (2.82mm) enables utilization of

unused space on the bottom of PC boards for high density

point of load regulation.

Additional features include overvoltage protection, foldback

overcurrent protection, thermal shutdown and programmable

soft-start. The power module is offered in a space saving and

thermally enhanced 15mm × 15mm × 2.82mm LGA pack-

age. The LTM4614 is RoHS compliant with Pb-free finish.

Different Combinations of Input and Output Voltages

NUMBER OF INPUTS NUMBER OF OUTPUTS IOUT(MAX)

2 2 4A, 4A

2 (Current Share,

Ex. 3.3V and 5V)

1 8A

1 2 4A, 4A

1 1 8A, see LTM4608A

n Telecom and Networking Equipment

n FPGA Power

n SERDES and Other Low Noise Applications

L, LT , LT C , LT M , µModule, Linear Technology and the Linear logo are registered trademarks

and LTpowerCAD is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 5481178, 6580258,

6304066, 6127815, 6498466, 6611131, 6724174.

n Dual 4A Output Power Supply

n Input Voltage Range: 2.375V to 5.5V

n 4A DC Typical, 5A Peak Output Current Each

n 0.8V Up to 5V Output Each, Parallelable

n ±2% Max Total DC Output Error (0°C ≤ TJ ≤ 125°C)

n Output Voltage Tracking

n Up to 95% Efficiency

n Programmable Soft-Start

n Short-Circuit and Overtemperature Protection

n Power Good Indicators

n Small and Very Low Profile Package:

15mm × 15mm × 2.82mm

Efficiency vs Output Current

Dual Output 4A DC/DC µModule Regulator

4614 F01a

VIN1

VIN2

VOUT1

FB1

VOUT2

FB2

LTM4614

GND1 GND2

100µF

100µF10µF

10µF

VOUT1

1.2V/4A

VOUT2

1.5V/4A

5.76k

10k

VIN1

3.3V TO 5V

VIN2

3.3V TO 5V

LOAD CURRENT (A)

EFFICIENCY (%)

4614 TA01b

75 123

VIN = 3.3V

VOUT

1.5V

VOUT

1.2V

LTM4614

4614fb

pin conFiguraTionabsoluTe MaxiMuM raTings

VIN1, VIN2, PGOOD1, PGOOD2 ...................... –0.3V to 6V

COMP1, COMP2, RUN/SS1, RUN/SS2

FB1, FB2,TRACK1, TRACK2 ......................... –0.3V to VIN

SW1, SW2, VOUT1, VOUT2 .............. –0.3V to (VIN + 0.3V)

Internal Operating Temperature Range

(Notes 2, 3) ............................................ –40°C to 125°C

Storage Temperature Range .................. –55°C to 125°C

Body Temperature, Solder Reflow ......................... 245°C

(Note 1)

LGA PACKAGE

144-LEAD (15mm × 15mm × 2.82mm)

TOP VIEW

1 2 3 4 5 6 7 8 109 11 12

GND1

GND2

SW1

VOUT2

VOUT1

VIN1

VIN2

RUN/SS1 FB1

COMP1TRACK1

COMP2TRACK2

PGOOD1

SW2

RUN/SS2 FB2PGOOD2

TJMAX = 125°C, θJCbottom = 2-3°C/W, θJA = 15°C/W, θJCtop = 25°C/W, θ Values Determined

Using a 4-Layer 95mm × 76mm PCB, Weight = 1.7g

elecTrical characTerisTics

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN(DC) Input DC Voltage l2.375 5.5 V

VOUT(DC) Output Voltage CIN = 22µF, COUT = 100µF, RFB = 5.76k

VIN = 2.375V to 5.5V, IOUT = 0A to 4A (Note 4)

0°C ≤ TJ ≤ 125°C

1.460

1.45

1.49

1.508

1.512

VIN(UVLO) Undervoltage Lockout Threshold IOUT = 0A 1.6 2 2.3 V

IINRUSH(VIN) Input Inrush Current at Start-Up IOUT = 0A, CIN = 22µF, COUT = 100µF, VOUT = 1.5V

VIN = 5.5V

0.35

IQ(VIN) Input Supply Bias Current VIN = 2.375V, VOUT = 1.5V, Switching Continuous

VIN = 5.5V, VOUT = 1.5V, Switching Continuous

Shutdown, RUN = 0, VIN = 5V

µA

The l denotes the specifications which apply over the full internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise noted. Refer to Figure 1.

Specified as each channel (Note 5).

LEAD FREE FINISH TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE (Note 2)

LTM4614EV#PBF LTM4614EV#PBF LTM4614V 144-Lead (15mm × 15mm × 2.82mm) LGA –40°C to 125°C

LTM4614IV#PBF LTM4614IV#PBF LTM4614V 144-Lead (15mm × 15mm × 2.82mm) LGA –40°C to 125°C

Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

This product is only offered in trays. For more information go to: http://www.linear.com/packaging/

orDer inForMaTion

(See Pin Functions, Pin Configuration Table)

LTM4614

4614fb

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

IS(VIN) Input Supply Current VIN = 2.375V, VOUT = 1.5V, IOUT = 4A

VIN = 5.5V, VOUT = 1.5V, IOUT = 4A

3.15

1.35

IOUT(DC) Output Continuous Current Range VIN = 3.3V, VOUT = 1.5V (Note 4) 0 4 A

∆VOUT(LINE)

VOUT

Line Regulation Accuracy VOUT = 1.5V, VIN from 2.375V to 5.5V, IOUT = 0A l0.1 0.3 %

∆VOUT(LOAD)

VOUT

Load Regulation Accuracy VOUT = 1.5V, 0A to 4A (Note 4), VIN = 2.375V to 5.5V

0°C ≤ TJ ≤ 125°C

0.7

1.2

1.25

1.5

VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 100µF (X5R)

VIN = 5V, VOUT = 1.5V

mVP-P

fsOutput Ripple Voltage Frequency IOUT = 4A, VIN = 5V, VOUT = 1.5V 1.25 MHz

∆VOUT(START) Turn-On Overshoot COUT = 100µF, VOUT = 1.5V, RUN/SS = 10nF,

IOUT = 0A

VIN = 3.3V

VIN = 5V

tSTART Turn-On Time COUT = 100µF, VOUT = 1.5V, IOUT = 1A Resistive Load,

TRACK = VIN and RUN/SS = Float

VIN = 5V

0.5

∆VOUT(LS) Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load,

COUT = 100µF, VIN = 5V, VOUT = 1.5V

25 mV

tSETTLE Settling Time for Dynamic Load

Step

Load: 0% to 50% to 0% of Full Load,

VIN = 5V, VOUT = 1.5V

10 µs

IOUT(PK) Output Current Limit COUT = 100µF

VIN = 5V, VOUT = 1.5V

VFB Voltage at FB Pin IOUT = 0A, VOUT = 1.5V

0.792

0.788

0.8

0.808

0.810

IFB 0.2 µA

VRUN RUN Pin On/Off Threshold 0.6 0.75 0.9 V

ITRACK TRACK Pin Current 0.2 µA

VTRACK(OFFSET)Offset Voltage TRACK = 0.4V 30 mV

VTRACK(RANGE) Tracking Input Range 0 0.8 V

RFBHI Resistor Between VOUT and FB Pins 4.96 4.99 5.025 kΩ

∆VPGOOD PGOOD Range ±7.5 %

RPGOOD PGOOD Resistance Open-Drain Pull-Down 90 150 Ω

elecTrical characTerisTics

The l denotes the specifications which apply over the full internal

operating temperature range (Note 2), otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise noted. Refer to Figure 1.

Specified as each channel (Note 5).

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTM4614 is tested under pulsed load conditions such that

TJ≈ TA. The LTM4614E is guaranteed to meet performance specifications

over the 0°C to 125°C internal operating temperature range. Specifications

over the –40°C to 125°C internal operating temperature range are assured

by design, characterization and correlation with statistical process

controls. The LTM4614I is guaranteed to meet specifications over the full

internal operating temperature range. Note that the maximum ambient

temperature consistent with these specifications is determined by specific

operating conditions in conjunction with board layout, the rated package

thermal resistance and other environmental factors.

Note 3: The IC has overtemperature protection that is intended to protect

the device during momentary overload conditions. Junction temperatures

will exceed 125°C when overtemperature is activated. Continuous

overtemperature activation can impair long-term reliability.

Note 4: See output current derating curves for different VIN, VOUT and TA.

Note 5: Tw o channels are tested separately and the specified test

conditions are applied to each channel.

LTM4614

4614fb

Typical perForMance characTerisTics

Efficiency vs Output Current

VIN = 2.5V

Efficiency vs Output Current

VIN = 3.3V

Efficiency vs Output Current

VIN = 5V

Minimum Input Voltage

at 4A Load Load Transient Response Load Transient Response

Load Transient Response Load Transient ResponseLoad Transient Response

OUTPUT CURRENT (A)

100

4614 G01

1 2 4

EFFICIENCY (%)

VOUT = 1.8V

VOUT = 1.5V

VOUT = 1.2V

VOUT = 0.8V

OUTPUT CURRENT (A)

100

4614 G02

1 2 4

EFFICIENCY (%)

VOUT = 2.5V

VOUT = 1.8V

VOUT = 1.5V

VOUT = 1.2V

VOUT = 0.8V

OUTPUT CURRENT (A)

EFFICIENCY (%)

1 2 3 4

4614 G03

VOUT = 3.3V

VOUT = 2.5V

VOUT = 1.8V

VOUT = 1.5V

VOUT = 1.2V

VOUT = 0.8V

VIN (V)

VOUT (V)

0.5

1.5

2.0

2.5

3.5

0.5 2.5 3.5

4614 G04

1.0

3.0

24.5 5.55

11.5 3 4

VOUT = 3.3V

VOUT = 2.5V

VOUT = 1.8V

VOUT = 1.5V

VOUT = 1.2V

VOUT = 0.8V

ILOAD

2A/DIV

VOUT

20mV/DIV

VIN = 5V

VOUT = 1.2V

COUT = 100µF, 6.3V CERAMICS

20µs/DIV 4614 G05

ILOAD

2A/DIV

VOUT

20mV/DIV

VIN = 5V

VOUT = 1.5V

COUT = 100µF, 6.3V CERAMICS

20µs/DIV 4614 G06

ILOAD

2A/DIV

VOUT

20mV/DIV

VIN = 5V

VOUT = 1.8V

COUT = 100µF, 6.3V CERAMICS

20µs/DIV 4614 G07

ILOAD

2A/DIV

VOUT

20mV/DIV

VIN = 5V

VOUT = 2.5V

COUT = 100µF, 6.3V CERAMICS

20µs/DIV 4614 G08

ILOAD

2A/DIV

VOUT

20mV/DIV

VIN = 5V

VOUT = 3.3V

COUT = 100µF, 6.3V CERAMICS

20µs/DIV 4614 G09

LTM4614

4614fb

Typical perForMance characTerisTics

Start-Up Start-Up VFB vs Temperature

Current Limit Foldback

Short-Circuit Protection

1.5V Short, No Load

TEMPERATURE (°C)

–50

794

VFB (mV)

796

798

800

802

804

806

–25 500 25 12510075

4614 G12

OUTPUT CURRENT (A)

VOUT (V)

0.6

0.8

1.0

4614 G13

0.4

0.2

04 5 7

1.2

1.4

1.6

VIN = 5V

VIN = 3.3V

VIN = 2.5V

VOUT = 1.5V

VOUT

0.5V/DIV

IIN

1A/DIV

20µs/DIV 4614 G14

Short-Circuit Protection

1.5V Short, 4A Load

VOUT

0.5V/DIV

IIN

1A/DIV

100µs/DIV 4614 G15

VOUT

1V/DIV

IIN

1A/DIV

VIN = 5V

VOUT = 2.5V

COUT = 100µF

NO LOAD

(0.01µF SOFT-START CAPACITOR)

200µs/DIV 4614 G10

VOUT

1V/DIV

IIN

1A/DIV

VIN = 5V

VOUT = 2.5V

COUT = 100µF

4A LOAD

(0.01µF SOFT-START CAPACITOR)

200µs/DIV 4614 G11

pin FuncTions

VIN1, VIN2 (J1-J6, K1-K6); (C1-C6, D1-D6): Power Input

Pins. Apply input voltage between these pins and GND

pins. Recommend placing input decoupling capacitance

directly between VIN pins and GND pins.

VOUT1, VOUT2 (J9-J12, K9-K12, L9-L12, M9-M12); (C9-C12,

D9-D12, E9-E12, F9-F12): Power Output Pins. Apply out-

put load between these pins and GND pins. Recommend

placing output decoupling capacitance directly between

these pins and GND pins. Review Table 4.

GND1, GND2, (G1-G12, H1, H7-H12, J7-J8, K7-K8, L1,

L7-L8, M1-M8); (A1-A12, B1, B7-B12, C7-C8, D7-D8,

E1, E7-E8, F1-F8): Power Ground Pins for Both Input

and Output Returns.

TRACK1, TRACK2 (L3, E3): Output Voltage Tracking Pins.

When the module is configured as a master output, then a

soft-start capacitor is placed on the RUN/SS pin to ground

to control the master ramp rate, or an external ramp can

be applied to the master regulator’s track pin to control it.

LTM4614

4614fb

pin FuncTions

Slave operation is performed by putting a resistor divider

from the master output to the ground, and connecting the

center point of the divider to this pin on the slave regulator.

If tracking is not desired, then connect the TRACK pin to

VIN. Load current must be present for tracking. See the

Applications Information section.

FB1, FB2 (L6, E6): The Negative Input of the Switching

Regulators’ Error Amplifier. Internally, these pins are con-

nected to VOUT with a 4.99k precision resistor. Different

output voltages can be programmed with an externally

connected resistor between the FB and GND pins. Tw o

power modules can current share when this pin is con-

nected in parallel with the adjacent module’s FB pin. See

the Applications Information section.

COMP1, COMP2 (L5, E5): Current Control Threshold

and Error Amplifier Compensation Point. The current

comparator threshold increases with this control voltage.

Tw o power modules can current share when this pin is

connected in parallel with the adjacent module’s COMP

pin. Each channel has been internally compensated. See

the Applications Information section.

PGOOD1, PGOOD2 (L4, E4): Output Voltage Power

Good Indicator. Open-drain logic output that is pulled to

ground when the output voltage is not within ±7.5% of

the regulation point.

RUN/SS1, RUN/SS2 (L2, E2): Run Control and Soft-Start

Pins. A voltage above 0.9V will turn on the module, and

below 0.6V will turn off the module. This pin has a 1M

resistor to VIN and a 1000pF capacitor to GND. The volt-

age on the RUN/SS pin clamps the control loop’s current

comparator threshold. A RUN/SS pin voltage of 2.375V

upon completion of soft-start guarantees the regulator can

deliver full output current. To turn off the module while

VIN remains active, the RUN/SS pin should be pulled low

with a falling edge ≤ 1µs to ensure the device does not

transition slowly through the internal undervoltage lockout

threshold. See Applications Information section for soft-

start information.

SW1, SW2 (H2-H6, B2-B6): The switching node of the

circuit is used for testing purposes. This can be connected

to copper on the board for improved thermal performance.

siMpliFieD block DiagraM

Figure 1. Simplified LTM4614 Block Diagram of Each Switching Regulator Channel

VIN

2.375V TO 5.5V

CSS

1000pF

CSSEXT

5.76k

RFB

5.76k

TRACK

SUPPLY

4.99k

470pF

4.7µF

6.3V

4.7µF

6.3V

100µF

X5R

VOUT

1.5V

M1 0.47µH

RSS

PGOOD

RUN/SS

TRACK

COMP

FB SW

VOUT

VIN

GND

4614 F01

4.99k

CONTROL, DRIVE

POWER FETS

INTERNAL

COMP

22µF

6.3V

LTM4614

4614fb

Decoupling requireMenTs

TA = 25°C. Use Figure 1 configuration for each channel.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

CIN External Input Capacitor Requirement

(VIN = 2.375V to 5.5V, VOUT = 1.5V)

IOUT = 4A 22 µF

COUT External Output Capacitor Requirement

(VIN = 2.375V to 5.5V, VOUT = 1.5V)

IOUT = 4A 100 µF

operaTion

LTM4614 POWER MODULE DESCRIPTION

The LTM4614 is a standalone dual nonisolated switching

mode DC/DC power supply. It can deliver up to 4A of DC

output current for each channel with few external input

and output capacitors. This module provides two precisely

regulated output voltages programmable via one external

resistor for each channel from 0.8V DC to 5V DC over

a 2.375V to 5.5V input voltage. The typical application

schematic is shown in Figure 12.

The LTM4614 has two integrated constant frequency cur-

rent mode regulators, with built-in power MOSFETs with

fast switching speed. The typical switching frequency is

1.25MHz. With current mode control and internal feedback

loop compensation, these switching regulators have suf-

ficient stability margins and good transient performance

under a wide range of operating conditions and with a

wide range of output capacitors, even all ceramic output

capacitors.

Current mode control provides cycle-by-cycle fast current

limit. Besides, current limiting is provided in an overcur-

rent condition with thermal shutdown. In addition, inter-

nal overvoltage and undervoltage comparators pull the

open-drain PGOOD outputs low if the particular output

feedback voltage exits a ±7.5% window around the regu-

lation point. Furthermore, in an overvoltage condition,

internal top FET, M1, is turned off and bottom FET, M2,

is turned on and held on until the overvoltage condition

clears, or current limit is exceeded.

Pulling each specific RUN pin below 0.8V forces the spe-

cific regulator controller into its shutdown state, turning

off both M1 and M2 for each power stage. At low load

current, each regulator works in continuous current mode

by default to achieve minimum output voltage ripple.

The TRACK and RUN/SS pins are used for power supply

tracking and soft-start programming for each specific

regulator. See the Applications Information section.

The LTM4614 is internally compensated to be stable over

the operating conditions. Table 4 provides a guideline for

input and output capacitance for several operating con-

ditions. The LTpowerCAD™ GUI is available for transient

and stability analysis.

The FB pins are used to program the specific output volt-

age with a single externally connected resistor to ground.

LTM4614

4614fb

applicaTions inForMaTion

Dual Switching Regulator

A typical LTM4614 application circuit is shown in Figure 12.

External component selection is primarily determined by

the maximum load current and output voltage. Refer to

Table 4 for specific external capacitor requirements for a

particular application.

VIN to VOUT Step-Down Ratios

There are restrictions in the maximum VIN and VOUT step-

down ratio than can be achieved for a given input voltage

on the two switching regulators. The LTM4614 is 100%

duty cycle capable, but the VIN to VOUT minimum dropout

will be a function the load current. A typical 0.5V minimum

is sufficient. See Typical Performance Characteristics.

Output Voltage Programming

Each regulator channel has an internal 0.8V reference

voltage. As shown in the Block Diagram, a 4.99k internal

feedback resistor connects the VOUT and FB pins together.

The output voltage will default to 0.8V with no externally

applied feedback resistor. Adding a resistor RFB from the

FB pin to GND programs the output voltage:

VOUT =0.8V •4.99k +RFB

RFB

Table 1. FB Resistor Table vs Various Output Voltages

VOUT 0.8V 1.0V 1.2V 1.5V 1.8V 2.5V 3.3V

RFB Open 20k 10k 5.76k 3.92k 2.37k 1.62k

Input Capacitors

The LTM4614 module should be connected to a low AC

impedance DC source. One 4.7µF ceramic capacitor is

included inside the module for each regulator channel.

Additional input capacitors are needed if a large load step

is required up to the full 4A level and for RMS ripple cur-

rent requirements. A 47µF bulk capacitor can be used for

more input bulk capacitance. This 47µF capacitor is only

needed if the input source impedance is compromised by

long inductive leads or traces.

For a buck converter, the switching duty cycle can be

estimated as:

D=VOUT

VIN

Without considering the inductor current ripple, the RMS

current of the input capacitor can be estimated as:

ICIN(RMS) =IOUT(MAX)

η%•D•1– D

( )

In the above equation, η% is the estimated efficiency of

the power module. The bulk capacitor can be a switcher-

rated aluminum electrolytic OS-CON or polymer capacitor.

If a low inductance plane is used to power the device,

then no input capacitance is required. The internal 4.7µF

ceramics on each channel input are typically rated for 1A

of RMS ripple current up to 85°C operation. The worst-

case ripple current for the 4A maximum current is 2A or

less. An additional 10µF or 22µF local ceramic capacitor

can be used to supplement the internal capacitor with an

additional 1A to 2A ripple current rating. See Figure 11

for recommended PCB layout.

Output Capacitors

The LTM4614 switchers are designed for low output volt-

age ripple on each channel. The bulk output capacitors

are chosen with low enough effective series resistance

(ESR) to meet the output voltage ripple and transient

requirements. The output capacitors can be low ESR tan-

talum capacitors, low ESR polymer capacitors or ceramic

capacitors. The typical output capacitance range is 66µF

to 100µF. Additional output filtering may be required by

the system designer if further reduction of output ripple

or dynamic transient spikes is required. Table 4 shows a

matrix of different output voltages and output capacitors

to minimize the voltage droop and overshoot during a 2A/

µs transient. The table optimizes total equivalent ESR and

total bulk capacitance to maximize transient performance.

See Figure 11 for recommended PCB layout.

LTM4614

4614fb

applicaTions inForMaTion

Figure 2. Dual Outputs (1.5V and 1.2V) with Tracking

4614 F02

PGOOD1

VOUT1

FB1

COMP1

TRACK1

RUN/SS1

PGOOD2

VOUT2

FB2

COMP2

TRACK2

RUN/SS2

LTM4614

VIN1 VIN2

GND1 GND2

10k

RTB

4.99k

RFB2

5.76k

VIN OR

CONTROL

RAMP

22µF

6.3V

100µF

6.3V

100µF

6.3V

1.2V

1.5V

PGOOD1

10k

PGOOD2

22µF

6.3V

22µF

6.3V

22µF

6.3V

VIN 3V TO 5.5V

RFB1

10k RTA

10k

1.5V

CSSEXT1

Fault Conditions: Current Limit and Overcurrent

Foldback

The LTM4614 has current mode control, which inher-

ently limits the cycle-by-cycle inductor current not only

in steady-state operation, but also in transient.

Along with foldback current limiting in the event of an

overload condition, the LTM4614 has overtemperature

shutdown protection that inhibits switching operation

around 150°C for each channel.

Run Enable and Soft-Start

The RUN/SS pins provide a dual function of enable and

soft-start control for each channel. The RUN/SS pins are

used to control turn on of the LTM4614. While each enable

pin is below 0.6V, the LTM4614 will be in a low quiescent

current state. At least a 0.9V level applied to the enable

pins will turn on the LTM4614 regulators. The voltage on

the RUN/SS pins clamp the control loop’s current com-

parator threshold. A RUN/SS pin voltage of 2.375V upon

completion of soft-start guarantees the regulator can deliver

full output current. These pins can be used to sequence

the regulator channels. Soft-start control is provided by

a 1M pull-up resistor (RSS) and a 1000pF capacitor (CSS)

as shown in the Block Diagram for each channel. Option-

ally, an external capacitor (CSSEXT) can be applied to the

RUN/SS pin to increase soft-start time. A typical value is

0.01µF. Soft-start time is approximately given by:

tSOFTSTART =In VIN

VIN – 1.8V









•RSS •CSS +CSSEXT

( )

where RSS and CSS are shown in the Block Diagram of

Figure1, and 1.8V is the soft-start upper range. The soft-

start function can also be used to control the output ramp-

up time, so that another regulator can be easily tracked

to it. To turn off the module while VIN remains active, the

RUN/SS pin should be pulled low with a falling edge ≤ 1µs

to ensure the device does not transition slowly through

the internal undervoltage lockout threshold.

Output Voltage Tracking

Output voltage tracking can be programmed externally

using the TRACK pins. Either output can be tracked up

or down with another regulator. The master regulator’s

output is divided down with an external resistor divider

that is the same as the slave regulator’s feedback divider

to implement coincident tracking. The LTM4614 uses a

very accurate 4.99k resistor for the internal top feedback

resistor. Figure 2 shows an example of coincident tracking.

Equations:

TRACK1=RFB1

4.99k +RFB1









•Master

Slave =1+4.99k

RFB1









•TRACK1

LTM4614

4614fb

applicaTions inForMaTion

Figure 3. Output Voltage Coincident Tracking

OUTPUT VOLTAGE (V)

TIME

MASTER OUTPUT

SLAVE OUTPUT

4614 F03

TRACK1 is the track ramp applied to the slave’s track pin.

TRACK1 applies the track reference for the slave output up

to the point of the programmed value at which TRACK1

proceeds beyond the 0.8V reference value. The TRACK1

pin must go beyond the 0.8V to ensure the slave output

has reached its final value.

Ratiometric tracking can be achieved by a few simple cal-

culations and the slew rate value applied to the master’s

TRACK pin. As mentioned above, the TRACK pin has a

control range from 0V to 0.8V. The control ramp slew rate

applied to the master’s TRACK pin is directly equal to the

master’s output slew rate in Volts/Time.

The equation:

SR •4.99k =RTB

where MR is the master’s output slew rate and SR is the

slave’s output slew rate in Volts/Time. When coincident

tracking is desired, then MR and SR are equal, thus RTB

is equal to 4.99k. RTA is derived from equation:

RTA =0.8V

VFB

4.99k +VFB

RFB

–VTRACK

RTB

where VFB is the feedback voltage reference of the regula-

tor, and VTRACK is 0.8V. Since RTB is equal to the 4.99k top

feedback resistor of the slave regulator in equal slew rate

or coincident tracking, then RTA is equal to RFB with VFB =

VTRACK. Therefore RTB = 4.99k and RTA = 10k in Figure 2.

Figure 3 shows the output voltage tracking waveform for

coincident tracking.

In ratiometric tracking, a different slew rate maybe desired

for the slave regulator. RTB can be solved for when SR

is slower than MR. Make sure that the slave supply slew

rate is chosen to be fast enough so that the slave output

voltage will reach it final value before the master output.

For example, MR = 2.5V/ms and SR = 1.8V/1ms. Then

RTB = 6.98k. Solve for RTA to equal to 3.24k. The master

output must be greater than the slave output for the

tracking to work. Output load current must be present

for tracking to operate properly during power down.

Power Good

PGOOD1 and PGOOD2 are open-drain pins that can be

used to monitor valid output voltage regulation. These

pins monitor a ±7.5% window around the regulation point.

COMP Pin

This pin is the external compensation pin. The module

has already been internally compensated for all output

voltages. Table 4 is provided for most application require-

ments. The LTpowerCAD GUI is available for other control

loop optimization.

LTM4614

4614fb

applicaTions inForMaTion

Parallel Switching Regulator Operation

The LTM4614 switching regulators are inherently current

mode control. Paralleling will have very good current shar-

ing. This will balance the thermals on the design. Figure

13 shows a schematic of a parallel design. The voltage

feedback equation changes with the variable N as chan-

nels are paralleled.

The equation:

VOUT =0.8V •

4.99k

N+RFB

RFB

N is the number of paralleled channels.

Thermal Considerations and Output Current Derating

The power loss curves in Figures 5 and 6 can be used

in coordination with the load current derating curves in

Figures 7 to 10 for calculating an approximate θJA thermal

resistance for the LTM4614 with various heat sinking

and airflow conditions. Both of the LTM4614 outputs

are at full 4A load current, and the power loss curves in

Figures 5 and 6 are combined power losses plotted for

both output voltages up to 4A each. The 4A output voltages

are 1.2V and 3.3V. These voltages are chosen to include

the lower and higher output voltage ranges for correlating

the thermal resistance. Thermal models are derived from

several temperature measurements in a controlled tem-

perature chamber along with thermal modeling analysis.

The junction temperatures are monitored while ambient

temperature is increased with and without airflow. The

junctions are maintained at ~120°C while lowering output

current or power while increasing ambient temperature.

The 120°C is chosen to allow for a 5°C margin window

relative to the maximum 125°C. The decreased output

current will decrease the internal module loss as ambi-

ent temperature is increased. The power loss curves in

Figures 5 and 6 show this amount of power loss as a

function of load current that is specified for both chan-

nels. The monitored junction temperature of 120°C minus

the ambient operating temperature specifies how much

Figure 5. 1.2V Power Loss Figure 6. 3.3V Power Loss

2.5

2.0

1.0

1.5

0.5

031

4614 F05

LOAD CURRENT (A)

POWER LOSS (W)

VIN = 5V

3.0

2.0

2.5

1.0

1.5

0.5

4614 F06

31 42

LOAD CURRENT (A)

POWER LOSS (W)

VIN = 5V

LTM4614

4614fb

Figure 7. 1.2V No Heat Sink (VIN = 5V) Figure 8. 1.2V Heat Sink (VIN = 5V)

applicaTions inForMaTion

Figure 9. 3.3V No Heat Sink (VIN = 5V) Figure 10. 3.3V Heat Sink (VIN = 5V)

4.5

2.0

3.0

3.5

4.0

2.5

1.0

1.5

0.5

4614 F07

11050 60 70 80 90 12010040

AMBIENT TEMPERATURE (°C)

LOAD CURRENT (A)

200LFM NO HEAT SINK

0LFM NO HEAT SINK

400LFM NO HEAT SINK

4.5

2.0

3.0

3.5

4.0

2.5

1.0

1.5

0.5

4614 F08

11050 60 70 80 90 12010040

0LFM HEAT SINK

200LFM HEAT SINK

400LFM HEAT SINK

AMBIENT TEMPERATURE (°C)

LOAD CURRENT (A)

4.5

2.0

3.0

3.5

4.0

2.5

1.0

1.5

0.5

4614 F09

11050 60 70 80

AMBIENT TEMPERATURE (°C)

90 12010040

0LFM NO HEAT SINK

200LFM NO HEAT SINK

LOAD CURRENT (A)

400LFM NO HEAT SINK

4.5

2.0

3.0

3.5

4.0

2.5

1.0

1.5

0.5

4614 F10

11050 60 70 80 90 12010040

AMBIENT TEMPERATURE (°C)

LOAD CURRENT (A)

0LFM HEAT SINK

200LFM HEAT SINK

400LFM HEAT SINK

module temperature rise can be allowed. As an example, in

Figure 7 the load current is derated to 3A for each channel

with 0LFM at ~ 90°C and the total combined power loss for

both channels at 5V to 1.2V at 3A output is ~1.5 watts. If

the 90°C ambient temperature is subtracted from the 120°C

maximum junction temperature, then the difference of

30°C divided by 1.5W equals a 20°C/W thermal resistance.

Table 2 specifies a 15°C/W value which is close. Table 2

and Table 3 provide equivalent thermal resistances for

1.2V and 3.3V outputs with and without air flow and

heat sinking. The combined power loss for the two 4A

outputs can be summed together and multiplied by the

thermal resistance values in Tables 2 and 3 for module

temperature rise under the specified conditions. The

printed circuit board is a 1.6mm thick four layer board

with 2 ounce copper for the two outer layers and 1 ounce

copper for the two inner layers. The PCB dimensions are

95mm × 76mm. The data sheet lists the θJA (junction to

ambient) and θJC (junction to case) thermal resistances

under the Pin Configuration diagram.

LTM4614

4614fb

applicaTions inForMaTion

Table 2. 1.2V Output

DERATING CURVE VIN (V) POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK θJA (°C/W)

Figure 7 5 Figure 5 0 None 15

Figure 7 5 Figure 5 200 None 12

Figure 7 5 Figure 5 400 None 10

Figure 8 5 Figure 5 0 BGA Heat Sink 12

Figure 8 5 Figure 5 200 BGA Heat Sink 9

Figure 8 5 Figure 5 400 BGA Heat Sink 7

Table 3. 3.3V Output

DERATING CURVE VIN (V) POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK θJA (°C/W)

Figure 9 5 Figure 6 0 None 15

Figure 9 5 Figure 6 200 None 12

Figure 9 5 Figure 6 400 None 10

Figure 10 5 Figure 6 0 BGA Heat Sink 12

Figure 10 5 Figure 6 200 BGA Heat Sink 9

Figure 10 5 Figure 6 400 BGA Heat Sink 7

HEAT SINK MANUFACTURER PART NUMBER WEBSITE

Aavid Thermalloy 375424b00034G www.aavid.com

LTM4614

4614fb

applicaTions inForMaTion

Figure 11. Recommended PCB Layout

CIN1

GND1

GND2

GND1

VIN1

GND1

GND2

GND2 GND2

GND1

VOUT2

VOUT1

VIN2

GND2 4614 F11

VOUT1

1 2 3 4 5 6 7 8 9 10 11 12

CIN2 COUT3 COUT4

COUT1 COUT2

I/O PINS

Safety Considerations

The LTM4614 modules do not provide galvanic isolation

from VIN to VOUT

. There is no internal fuse. If required,

a slow blow fuse with a rating twice the maximum input

current needs to be provided to protect each unit from

catastrophic failure.

Layout Checklist/Example

The high integration of LTM4614 makes the PCB board

layout very simple and easy. However, to optimize its

electrical and thermal performance, some layout consid-

erations are still necessary.

• Refer to http://www.linear.com/docs/29812 for device

land pattern and stencil design.

• Use large PCB copper areas for high current paths,

including VIN, GND and VOUT. It helps to minimize the

PCB conduction loss and thermal stress.

• Place high frequency ceramic input and output capaci-

tors next to the VIN, GND and VOUT pins to minimize

high frequency noise.

• Place a dedicated power ground layer underneath the

unit.

• To minimize the via conduction loss and reduce module

thermal stress, use multiple vias for interconnection

between the top layer and other power layers.

• Do not put vias directly on pads unless they are capped.

Figure 11 gives a good example of the recommended layout.

LTM4614

4614fb

applicaTions inForMaTion

Figure 12. Typical 2.375VIN to 5.5VIN, 1.2V and 1V at 4A

Table 4. Output Voltage Response vs Component Matrix (Refer to Figure 12) 0A to 2.5A Load Step Typical Measured Values

COUT1 AND COUT2 CERAMIC VENDORS VALUE PART NUMBER COUT1 AND COUT2 BULK VENDORS VALUE PART NUMBER

TDK 22µF 6.3V C3216X7SOJ226M Sanyo POSCAP 150µF 10V 10TPD150M

Murata 22µF 16V GRM31CR61C226KE15L Sanyo POSCAP 220µF 4V 4TPE220MF

TDK 100µF 6.3V C4532X5R0J107MZ CIN BULK VENDORS VALUE PART NUMBER

Murata 100µF 6.3V GRM32ER60J107M SUNCON 100µF 10V 10CE100FH

VOUT

(V)

CIN

(CERAMIC)

CIN

(BULK)*

COUT1 AND COUT2

(CER) EACH

COUT1 AND COUT2

(POSCAP) EACH

ITH

VIN

(V)

DROOP

(mV)

PEAK-TO-PEAK

DEVIATION

RECOVERY

TIME (µs)

LOAD STEP

(A/µs)

RFB

(kΩ)

1.2 10µF ×2100µF 100µF, 22µF ×2None None 5 33 68 11 2.5 10

1.2 10µF ×2100µF 22µF ×1220µF None 5 25 50 9 2.5 10

1.2 10µF ×2100µF 100µF, 22µF ×2None None 3.3 33 68 8 2.5 10

1.2 10µF ×2100µF 22µF ×1220µF None 3.3 25 50 10 2.5 10

1.5 10µF ×2100µF 100µF, 22µF ×2None None 5 30 60 11 2.5 5.76

1.5 10µF ×2100µF 22µF ×1220µF None 5 28 60 11 2.5 5.76

1.5 10µF ×2100µF 100µF, 22µF ×2None None 3.3 30 60 10 2.5 5.76

1.5 10µF ×2100µF 22µF ×1220µF None 3.3 27 56 10 2.5 5.76

1.8 10µF ×2100µF 100µF, 22µF ×2None None 5 34 68 12 2.5 3.92

1.8 10µF ×2100µF 22µF ×1220µF None 5 30 60 12 2.5 3.92

1.8 10µF ×2100µF 22µF ×1220µF None 3.3 30 60 12 2.5 3.92

2.5 10µF ×2None 22µF ×1None None 5 50 90 10 2.5 2.37

2.5 10µF ×2100µF 22µF ×1150µF None 5 33 60 10 2.5 2.37

2.5 10µF ×2100µF 22µF ×1150µF None 3.3 50 95 12 2.5 2.37

3.3 10µF ×2100µF 22µF ×1150µF None 5 50 90 12 2.5 1.62

*Bulk capacitance is optional if VIN has very low input impedance.

4614 F12

PGOOD1

VOUT1

FB1

COMP1

TRACK1

RUN/SS1

PGOOD2

VOUT2

FB2

COMP2

TRACK2

RUN/SS2

LTM4614

VIN1 VIN2

GND1 GND2

10k

VIN

100µF

6.3V

100µF

6.3V

470µF

1.2V

22µF

6.3V

22µF

6.3V

X5R OR X7R

22µF

6.3V

VIN 2.375V TO 5.5V

20k CSSEXT1

0.1µF

LTM4614

4614fb

applicaTions inForMaTion

Figure 13. LTM4614 Parallel 1.2V at 8A Design (Also, See the LTM4608A)

Figure 14. 1.8V and 1.5V at 4A with Output Voltage Tracking Design

4614 F14

PGOOD1

VOUT1

FB1

COMP1

TRACK1

RUN/SS1

PGOOD2

VOUT2

FB2

COMP2

TRACK2

RUN/SS2

LTM4614

VIN1 VIN2

GND1 GND2

5.76k

VIN

22µF

6.3V

22µF

6.3V

100µF

6.3V

4.99k

1.8V

1.5V

100µF

6.3V

22µF

6.3V

X5R OR X7R

22µF

6.3V

X5R OR X7R

VIN 2.375V TO 5.5V

4.02k

CSSEXT

0.01µF

10k

X5R OR X7R

REFER TO TABLE 4

X5R OR X7R

REFER TO TABLE 4

1.8V

4614 F13

PGOOD1

VOUT1

FB1

COMP1

TRACK1

RUN/SS1

PGOOD2

VOUT2

FB2

COMP2

TRACK2

RUN/SS2

LTM4614

VIN1 VIN2

GND1 GND2

VIN

100µF

6.3V

X5R OR X7R

100µF

6.3V

1.2V

22µF

6.3V

X5R OR X7R

22µF

6.3V

VIN 3V TO 5.5V

CSSEXT1

0.01µF

PGOOD

4.99k

LTM4614

4614fb

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994

2. ALL DIMENSIONS ARE IN MILLIMETERS

BALL DESIGNATION PER JESD MS-028 AND JEP95

5. PRIMARY DATUM -Z- IS SEATING PLANE

DETAILS OF PIN #1 IDENTIFIER ARE OPTIONAL,

BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.

THE PIN #1 IDENTIFIER MAY BE EITHER A MOLD OR

MARKED FEATURE

PACKAGE TOP VIEW

PIN “A1”

CORNER

aaa Z

PACKAGE BOTTOM VIEW

SEE NOTES

SUGGESTED PCB LAYOUT

TOP VIEW LGA 144 1111 REV B

LTMXXXXXX

µModule

TRAY PIN 1

BEVEL

PACKAGE IN TRAY LOADING ORIENTATION

COMPONENT

PIN “A1”

0.0000

LGA Package

144-Lead (15mm × 15mm × 2.82mm)

(Reference LTC DWG # 05-08-1816 Rev B)

0.6350

1.9050

3.1750

4.4450

5.7150

6.9850

5.7150

4.4450

3.1750

1.9050

0.6350

6.9850

DETAIL B

PACKAGE SIDE VIEW

bbb Z

SYMBOL

aaa

bbb

eee

MIN

2.72

0.60

0.27

2.45

NOM

2.82

0.63

15.00

1.27

13.97

0.32

2.50

MAX

2.92

0.66

0.37

2.55

0.15

0.10

0.05

NOTES

DIMENSIONS

TOTAL NUMBER OF LGA PADS: 144

DETAIL B

SUBSTRATE

MOLD

CAP

DIA 0.630

PAD 1

3x, C (0.22 x45°)

DETAIL A

0.630 ±0.025 SQ. 143x

SYXeee

DETAIL A

2 14 356712 891011

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

LTM4614

4614fb

package DescripTion

LTM4614 Component LGA Pinout

PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION

A1 GND2 B1 GND2 C1 VIN2 D1 VIN2 E1 GND2 F1 GND2

A2 GND2 B2 SW2 C2 VIN2 D2 VIN2 E2 RUN/SS2 F2 GND2

A3 GND2 B3 SW2 C3 VIN2 D3 VIN2 E3 TRACK2 F3 GND2

A4 GND2 B4 SW2 C4 VIN2 D4 VIN2 E4 PGOOD2 F4 GND2

A5 GND2 B5 SW2 C5 VIN2 D5 VIN2 E5 COMP2 F5 GND2

A6 GND2 B6 SW2 C6 VIN2 D6 VIN2 E6 FB2 F6 GND2

A7 GND2 B7 GND2 C7 GND2 D7 GND2 E7 GND2 F7 GND2

A8 GND2 B8 GND2 C8 GND2 D8 GND2 E8 GND2 F8 GND2

A9 GND2 B9 GND2 C9 VOUT2 D9 VOUT2 E9 VOUT2 F9 VOUT2

A10 GND2 B10 GND2 C10 VOUT2 D10 VOUT2 E10 VOUT2 F10 VOUT2

A11 GND2 B11 GND2 C11 VOUT2 D11 VOUT2 E11 VOUT2 F11 VOUT2

A12 GND2 B12 GND2 C12 VOUT2 D12 VOUT2 E12 VOUT2 F12 VOUT2

PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION PIN ID FUNCTION

G1 GND1 H1 GND1 J1 VIN1 K1 VIN1 L1 GND1 M1 GND1

G2 GND1 H2 SW1 J2 VIN1 K2 VIN1 L2 RUN/SS1 M2 GND1

G3 GND1 H3 SW1 J3 VIN1 K3 VIN1 L3 TRACK1 M3 GND1

G4 GND1 H4 SW1 J4 VIN1 K4 VIN1 L4 PGOOD1 M4 GND1

G5 GND1 H5 SW1 J5 VIN1 K5 VIN1 L5 COMP1 M5 GND1

G6 GND1 H6 SW1 J6 VIN1 K6 VIN1 L6 FB1 M6 GND1

G7 GND1 H7 GND1 J7 GND1 K7 GND1 L7 GND1 M7 GND1

G8 GND1 H8 GND1 J8 GND1 K8 GND1 L8 GND1 M8 GND1

G9 GND1 H9 GND1 J9 VOUT1 K9 VOUT1 L9 VOUT1 M9 VOUT1

G10 GND1 H10 GND1 J10 VOUT1 K10 VOUT1 L10 VOUT1 M10 VOUT1

G11 GND1 H11 GND1 J11 VOUT1 K11 VOUT1 L11 VOUT1 M11 VOUT1

G12 GND1 H12 GND1 J12 VOUT1 K12 VOUT1 L12 VOUT1 M12 VOUT1

LTM4614

4614fb

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

revision hisTory

REV DATE DESCRIPTION PAGE NUMBER

B 08/12 Update Pin Configuration drawing.

Remove reference to obsolete Application Note.

Correct typical performance curves.

Clarify RUN/SS and FB Pin Function information.

Update Block Diagram.

Clarify RUN/SS Applications Information.

Correct feedback resistor value.

4 and 5

(Revision history begins at Rev B)

LTM4614

4614fb

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2009

LT 0812 REV B • PRINTED IN USA

relaTeD parTs

PART NUMBER DESCRIPTION COMMENTS

LT C

2900 Quad Supply Monitor with Adjustable Reset Timer Monitors Four Supplies, Adjustable Reset Timer

LTC2923 Power Supply Tracking Controller Tracks Both Up and Down, Power Supply Sequencing

LTM4600HV 10A DC/DC µModule Regulator 4.5V ≤ VIN ≤ 28V, 0.6V ≤ VOUT ≤ 5V, LGA Package

LTM4600HVMP Wide Temperature Range 10A DC/DC µModule Regulator Guaranteed Operation from –55°C to 125°C Ambient, LGA Package

LTM4601A 12A DC/DC µModule Regulator with PLL, Output

Tracking/Margining and Remote Sensing

Synchronizable PolyPhase

Operation, LTM4601-1/LTM4601A-1

Version Has No Remote Sensing, LGA Package

LTM4602 6A DC/DC µModule Regulator Pin Compatible with the LTM4600, LGA Package

LTM4603 6A DC/DC µModule Regulator with PLL and Output

Tracking/Margining and Remote Sensing

Synchronizable, PolyPhase Operation, LTM4603-1 Version Has No

Remote Sensing, Pin Compatible with the LTM4601, LGA Package

LTM4604A Low VIN 4A DC/DC µModule Regulator 2.375V ≤ VIN ≤ 5.5V, 0.8V ≤ VOUT ≤ 5V, 9mm × 15mm × 2.32mm

LGA Package

LTM4605 5A to 12A Buck-Boost µModule Regulator 4.5V ≤ VIN ≤ 20V, 0.8V ≤ VOUT ≤ 16V, 15mm × 15mm × 2.82mm

LGA Package

LTM4607 5A to 12A Buck-Boost µModule Regulator 4.5V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 25V, 15mm × 15mm × 2.82mm

LGA Package

LTM4608A Low VIN 8A DC/DC Step-Down µModule Regulator 2.7V ≤ VIN ≤ 5.5V, 0.6V ≤ VOUT ≤ 5V, 9mm × 15mm × 2.82mm

LGA Package

LTM4615 Triple Low VIN DC/DC µModule Regulator Tw o 4A Outputs and One 1.5A Output; 15mm × 15mm × 2.82mm

LTM4616 Dual 8A DC/DC µModule Regulator Current Share Inputs or Outputs; 15mm × 15mm × 2.82mm

LTM8020 High VIN 0.2A DC/DC Step-Down µModule Regulator 4V ≤ VIN ≤ 36V, 1.25V ≤ VOUT ≤ 5V, 6.25mm × 6.25mm × 2.32mm

LGA Package

LTM8021 High VIN 0.5A DC/DC Step-Down µModule Regulator 3V ≤ VIN ≤ 36V, 0.4V ≤ VOUT ≤ 5V, 6.25mm × 11.25mm × 2.82mm

LGA Package

LTM8022 High VIN 1A DC/DC Step-Down µModule Regulator 3.6V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, 11.25mm × 9mm × 2.82mm

LGA Package

LTM8023 High VIN 2A DC/DC Step-Down µModule Regulator 3.6V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, 11.25mm × 9mm × 2.82mm

LGA Package

PolyPhase is a registered trademark of Linear Technology Corporation.

package phoTograph