LTM4660

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

60V, 300W Hybrid Step-Down

µModule Bus Converter

The LTM®4660 is a complete 300W output switching

(micromodule) nonisolated bus converter. Its exposed

power inductor resides on the top of the package, pro-

viding an intrinsic path for heat to dissipate up and out

of the module—away from one’s printed circuit board.

Included in the package are the switching controller IC,

power MOSFETs and supporting components. Only flying

(charge-pump) capacitors, bulk input and output bypass

capacitors, and a few configuration passives are needed.

The LTM4660 features frequency synchronization,

tracking. An onboard temperature diode is available for

temperature monitoring. The LTM4660 protects against

short-circuit, overcurrent, and overtemperature faults. For

higher power applications, multiple LTM4660 modules

can be easily paralleled.

The LTM4660 is offered in a 16mm × 16mm × 10.34mm

BGA package with RoHS compliant terminal finish.

12V, 25A DC/DC μModule Nonisolated Bus Converter

Efficiency vs Load Current

APPLICATIONS

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Input Voltage Range: 30V to 60V (65V Abs. Max.)

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n

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±1.5% Maximum Total DC Output Error

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Up to 300W Output Power

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Scalable: Parallel LTM4660s for Higher Power

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Fixed Frequency Current Mode Control

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Phase-Lockable External Synchronization from

200kHz to 1MHz

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Low Start-Up Inrush Current with Flying Capacitor

Voltage-Balancing Prior to DC/DC Switching Action

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Output Voltage Tracking with Soft-Start

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Short-Circuit Protection with Adjustable Retry-Timer

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Overcurrent and Overtemperature Protection

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Onboard Diode Temperature Monitor

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Optional External Reference Input

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Power Good and FAULT Indicators

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16mm × 16mm × 10.34mm BGA Package

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Telecom, Data Centers and Networking Equipment

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Industrial and Test Equipment

All registered trademarks and trademarks are the property of their respective owners. Protected

by U.S. patents, including 9484799.

10µF

50V

×12

10k

RUN

EXT_REF

FAULT

PGOOD

FAULT

PGOOD

MID

HYS_PRGM

TIMER

COMPa

PGND

LTM4660

4660 TA01a

COMPb

FREQ

TRACK/SS

MODE/PLLIN

TEMP

SGND

10µF

×2

10µF

50V

×12

22µF

×2

1µF

30V TO 60V

12V

25A

10k

100k

150µF

0.1µF

49.9k

4.32k

+

LOAD CURRENT (A)

0

5

10

15

20

25

94

95

96

97

98

4660 TA01b