fitipower integrated technology lnc.
Typical Application Circuit
FP6137A/B
VIN
1.8V/2.5V
CIN
470µF
EN
RU
100K
VIN VCNTL
FP6137A/B
REFEN VOUT
0.9V/1.25V
VOUT
RD
CSS
Q1
100K
1µF
GND
CVOUT
470µF
VCNTL
3.3V
CCNTL
47µF
Figure 2. Typical Application Circuit of FP6137
Functional Pin Description
Pin Name
VIN
GND
VCNTL
REFEN
VOUT
Pin Function
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.
Common Ground Pin. The VOUT sinks current to GND by lower NMOS.
Power Input Pin. The VCNTL power supplies the internal control circuitry and gate drive voltage.
Chip Enable, and Input Reference Voltage Pin. The reference voltage is half of the VIN power by two external
voltage divide resistors.
Regulator Output Pin. VOUT voltage tracks the REFEN voltage and is capable of sourcing or sinking current up
to peak 3A.
FP6137-2.0-MAY-2012
2