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LTM4656Y

Synchronous Boost µModule Regulator with Input-Output Short Protection

Analog Devices 

LTM4656/LTM4656-1

Synchronous Boost µModule Regulator

with Input-Output Short Protection

FEATURES

n Complete Boost Switch Mode Power Supply

n Wide Input Voltage Range: 4.5V to 28V

n Output Voltage Range: 6V to 36V

n 4A Continuous Output Current (12VIN, 24VOUT)

n ±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 Selectable Burst Mode® Operation

n In-Line Overcurrent Protection

n Overtemperature Protection

n LTM4656-1 Adjustable Compensation Version

n 16mm × 16mm × 7.07mm BGA Package

APPLICATIONS

n Telecom and Networking Equipment

n Electronic Test Equipment

DESCRIPTION

The LTM®4656 is a complete high efficiency boost

µModule® (power module) regulator with the switch-

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.

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.

TYPICAL APPLICATION

12VIN, 24VOUT at 4A

12V PROTECTED

VIN

12V

VIN

SHDN

UV

9 V 20k

TURN ON

VBIAS

SS

0.1µF

FLT

LTM4656

INTVCC MODE_PLLIN

FREQ

60.4k

TEMP+

TEMP–

TO TEMP MONITOR

INTVCC

4.7µF

INTVCC

4.7k

PGOOD

12V PROTECTED

BVIN

100µF

22µF

5A NTSA545

VOUT

VFB

PGND

24V AT 4A

R4

150µF

10µF

11.5k

VOUT

24V

10µF

4656 TA01a

PINS UNUSED IN THIS APPLICATION:

TMR, RUN, COMP, SENSE1, SW

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For more information www.analog.com

24V Output Efficiency at 550kHz

100

4.5

98

EFFICIENCY

4.0

96

3.5

94

3.0

92

2.5

90

POWER LOSS

2.0

88

86

1.5

84

1.0

82

0.5

80

0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

OUTPUT CURRENT (A)

4656 TA01b

Rev. 0

1

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