Pin Functions

Name

SOT-25

Function

IN

1

Supply Voltage Input.

Require a minimum input capacitor of close to 2.2µF to ensure stability and

sufficient decoupling from the ground pin.

GND

2

Ground Pin.

EN

3

Enable Input.

Enable the regulator by pulling the EN pin High. To keep the regulator on during

under all operating conditions.

ADJ

4

Adjustable Control.

Connecting to GND to get output Voltage-A,

Use external divider resistors to achieve desired output Voltage-C.

OUT

5

Output Voltage Feedback.

Functional Block Diagram

Fast

Start-up

Circuit

Current

Limit

Thermal

Protection

Error

Amp.

+

-

IN

EN

OUT

GND

Bandgap

Vout

select

ADJ

FIG.1. Functional Block Diagram of FC8731

FC8731

2018. 05. 03

3/11

Revision No : 1