LTM4643

1

4643fb

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3A per Output

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Wide Input Voltage Range: 4V to 20V

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2.375V to 20V with External Bias

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0.6V to 3.3V Output Voltage

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3A DC Output Current Each Channel

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±1.5% Total Output Voltage Regulation

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Current Mode Control, Fast Transient Response

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Parallelable for Higher Output Current

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Output Voltage Tracking

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Internal Temperature Sensing Diode Output

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External Frequency Synchronization

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Overvoltage, Current and Temperature Protection

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9mm × 15mm × 1.82mm LGA and 9mm × 15mm ×

2.42mm BGA Packages

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Ultrathin Quad µModule

Regulator with Configurable

3A Output Array

The LTM®4643 is a quad DC/DC step-down µModule

(power module) regulator with 3A per output. Outputs can

be paralleled in an array for up to 12A capability. Included

in the package are the switching controllers, power FETs,

inductors and support components. Operating over an

input voltage range of 4V to 20V or 2.375V to 20V with

an external bias supply, the LTM4643 supports an output

voltage range of 0.6V to 3.3V each set by a single external

resistor. Its high efficiency design delivers 3A continuous

output current per channel. Only bulk input and output

capacitors are needed.

Fault protection features include overvoltage, overcurrent

and overtemperature protection. The LTM4643 is offered

in a 9mm ×15mm × 1.82mm LGA and 9mm × 15mm ×

2.42mm BGA packages with SnPb (BGA) or RoHS compli-

ant terminal finish.

Configurable Output Array*

3A

3A

3A

3A

6A

3A

3A

9A

3A

12A

* Note 4

1.5V Output Efficiency and

Power Loss (Each Channel)

APPLICATIONS

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FPGAs, GPUs and ASICs Applications

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PCIe and Backside PCB Mounting

4V to 20V Input, Quad 0.9V, 1V, 1.2V and

1.5V Output DC/DC µModule Regulator

L

, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, LTpowerCAD and PolyPhase

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

respective owners.

4643 TA01a

SVIN1

RUN1

SVIN2

RUN2

SVIN3

RUN3

SVIN4

RUN4

SGND

LTM4643

CLKIN

22µF

×2

25V

CLKOUT

TEMP

GND

FB1

PGOOD1

FB2

PGOOD2

FB3

PGOOD3

FB4

PGOOD4

47µF

4V

1.5V/3A

4V to 20V

40.2k

47µF

4V

1.2V/3A

60.4k

47µF

4V

1V/3A

90.9k

47µF

4V

0.9V/3A

121k

NOT ALL PINS

ARE SHOWN

LOAD CURRENT (A)

0

55

75

80

85

95

1

4643 TA01b

70

65

60

90

0.0

0.6

0.4

0.2

1.2

1.0

0.8

1.6

1.4

3

2

0.5

1.5

2.5