LTM4642

1

4642fb

Typical applicaTion

DescripTion

DC/DC µModule Regulator

TheLTM®4642isacompletedual4Aorsingle8Astep-down

packagearetheswitchingcontroller,powerFETs,inductor,

and all support components. Operating over input voltage

ranges of 4.5V to 20V, (2.375V min with external CPWR

bias), the LTM4642 supports two outputs with voltage

ranges of 0.6V to 5.5V, set by a single external resistor.

Its high efficiency design delivers 4A continuous current

(5A peak) for each output.

High switching frequency and a valley current mode

architecture enable a very fast transient response to line

and load changes without sacrificing stability. The two

outputs are interleaved with 180° phase to minimize the

ripple noise and reduce the I/O capacitors.

The power module is offered in a 9mm × 11.25mm ×

4.92mm BGA package. The LTM4642 is RoHS compliant

with Pb-free finish.

Dual 4A 1V and 1.2V DC/DC µModule Regulator

FeaTures

applicaTions

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Small Form Factor Dual 4A Power Supply

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Wide Input Voltage Range: 4.5V to 20V

(2.375V Min with CPWR Bias)

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Dual 180° Out-of-Phase Outputs with 4A DC

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Dual Outputs with 0.6V to 5.5V Range

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Output Voltage Tracking

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±1.5% Maximum Total DC Output Voltage Error

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Up to 95% Maximum Efficiency

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Phase-Lockable Fixed Frequency 600kHz to 1.4MHz

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Constant On-Time, Valley Current Mode Architecture

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Output Overvoltage and Overcurrent Protection

n

9mm × 11.25mm × 4.92mm BGA Package

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Telecom and Networking Equipment

n

Servers

n

FPGA Power

Efficiency vs Load Current at 12V input

L

, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule and LTpowerCAD

are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their

respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066,

6476589, 6774611, 8163643.

+

SGND

GND

LTM4642

4.7µF

22µF

2×

47µF

470pF

470pF

100µF

0.1µF

4.75V TO 20V

2.2

RUN1

133k

10k

90.9k

61.9k

60.4k

4642 TA01a

10k

RUN2

PGOOD1

PGOOD2

TRACK/SS1

TRACK/SS2

MODE/PLLIN

FREQ

+

47µF

100µF

0.1µF

LOAD CURRENT (A)

0

70

75

80

85

1

2

3

4

4642 TA01b

90

0.5

1.5

2.7

3.5

1.2V (650kHz)

1V (650kHz)