LTM4657

8

Rev. A

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BLOCK DIAGRAM

DECOUPLING REQUIREMENTS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

External Input Capacitor Requirement

10

22

µF

External Output Capacitor Requirement

150*

330*

µF

*Additional capacitance may be required under extreme temperature and/or capacitor bias voltage conditions due to variation of actual capacitance over bias voltage and temperature.

Figure 1. Simplified LTM4657 Block Diagram

POWER CONTROL

2.2µF

0.1µF

0.1µF

10µF

25V

TRACK/SS

RUN

MODE/CLKIN

CLKOUT

PHMODE

COMPa

COMPb

1µF

FB

10k

PGOOD

1.5V

8A

40.2k

60.4k

3.1V TO 20V

GND

0.38µH

4657 BD

FREQ

332k

INTERNAL

COMP

GND

INTERNAL

FILTER

100µF

×2

6.3V