2

FP6137-2.1-MAR-2013

FP6137A/B

fitipower integrated technology lnc.

Typical Application Circuit

47µF

FP6137A/B

EN

Q1

1.8V/2.5V

3.3V

GND

VOUT

REFEN

VCNTL

VIN

470µF

0.9V/1.25V

100K

100K

470µF

1µF

Figure 2. Typical Application Circuit of FP6137

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.