LTM4656/LTM4656-1

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Synchronous Boost µModule Regulator

with Input-Output Short Protection

The LTM®4656 is a complete high efficiency boost

ing controller, power FETs, inductor, and all supporting

components. Only a few input and output capacitors are

needed. Operating over an input voltage range of 4.5V to

28V, the LTM4656 supports an output voltage range of 6V

to 36V, set by a single external resistor. Its high efficiency

design delivers up to 5A continuous output current. An

in-line protection circuit sets the maximum input current,

and will trip off the input power if exceeded and retry (see

Typical Applications section).

The high density boost design can convert up to 180W

of output power.

Fault protection features include overtemperature pro-

tection, and overcurrent protection input referred with

auto-retry. The µmodule is offered in a space saving

and thermally enhanced 16mm × 16mm × 7.07mm BGA

package. The LTM4656 is Pb-free and RoHS compliant.

APPLICATIONS

n

Complete Boost Switch Mode Power Supply

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Wide Input Voltage Range: 4.5V to 28V

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Output Voltage Range: 6V to 36V

n

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±2% Maximum Total Output Voltage Regulation

Over Load, Line and Temperature

n

Input Disconnect in Shutdown

n

Inrush Current Limit

n

External Frequency Synchronization

n

Programmable Frequency (350kHz to 780kHz)

n

Parallel Current Sharing

n

Up to 98% Efficiency

n

n

In-Line Overcurrent Protection

n

Overtemperature Protection

n

LTM4656-1 Adjustable Compensation Version

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16mm × 16mm × 7.07mm BGA Package

n

Telecom and Networking Equipment

n

Electronic Test Equipment

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

by U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6177787, 6498466,

6580258, 6611131.

12V

12V PROTECTED

R4

11.5k

4.7µF

0.1µF

9 V

TURN ON

20k

60.4k

4.7k

10µF

10µF

150µF

22µF

100µF

PGOOD

SS

UV

FREQ

MODE_PLLIN

PGND

SHDN

FLT

LTM4656

TO TEMP MONITOR

24V AT 4A

12V PROTECTED

24V

5A NTSA545

4656 TA01a

PINS UNUSED IN THIS APPLICATION:

TMR, RUN, COMP, SENSE1, SW

OUTPUT CURRENT (A)

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

80

82

84

86

88

90

92

94

96

98

100

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

4656 TA01b

EFFICIENCY

POWER LOSS

24V Output Efficiency at 550kHz