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FP6137F-0.2-JUL-2011

FP6137F

fitipower integrated technology lnc.

Typical Application Circuit

EN

Q1

1.35V/1.5V/1.8V/2.5V

3.3V

GND

VOUT

REFEN

VCNTL

VIN

470µF

0.675V/0.75V/0.9V/1.25V

100K

100K

FP6137F

470µF

1µF

47µF

Figure 2. Typical Application Circuit of FP6137F with EC Capacitors

1µF

EN

Q1

1.35V/1.5V/1.8V/2.5V

3.3V

GND

VOUT

REFEN

VCNTL

VIN

22µF

0.675V/0.75V/0.9V/1.25V

100K

FP6137F

10µF

1µF

Note A: The recommend value of resistor is 10k~100k

*A

100K

*A

Figure 3. Typical Application Circuit of FP6137F with MLCC Capacitors

Functional Pin Description

Pin Name

Pin Function

VIN

Power input pin.

VIN is the input power supply used to create the external reference voltage for regulating

VOUT.

VIN sources current to VOUT by upper NMOS.

GND

Common ground pin.

The VOUT sinks current to GND by lower NMOS.

VCNTL

Power input pin.

The VCNTL power supplies the internal control circuitry and gate drive voltage.

REFEN

Chip enable, and input reference voltage pin.

The reference voltage is half of the VIN power by two external

voltage divide resistors.

VOUT

Regulator output pin.

VOUT voltage tracks the REFEN voltage and is capable of sourcing or sinking current up

to peak 3A.