2

FP6711-1.4-DEC-2011

FP6711

85T

fitipower integrated technology lnc.

Typical Application Circuit

22µF

ADEN

LBI

VIN

FP6711

EN

COMP

FB

LBO

VOUT

GND

SW

10µF

R1

R2

L1

10µH

OFF

ON

R5

Low Battery

Warning

680K

100P

R3

R4

Figure 2. Typical Application Circuit of FP6711

Functional Pin Description

Pin Name

Pin Function

EN

Chip-enable input.

Pull the pin high to enable IC.

Pull the pin low to shutdown IC.

COMP

The gm error amplifier output.

A frequency compensation network is connected from this pin to ground to

compensate the loop.

FB

The feedback input for adjusting output voltage.

This pin connects resistor divider that output voltage could be

adjusted from 1.8V to 4V.

The feedback voltage is typical at 0.5V.

GND

Ground pin

VOUT

Output voltage pin

VIN

Input voltage pin

SW

Switch input pin which is connected to inductor

ADEN

Auto-discharge enable input pin.

The auto-discharge function will be enabled when this pin is connected to logic

high.

It will be disabled when this pin is connected to logic low.

LBI

Low battery detector input.

A low battery warning signal is generated at LBO when the voltage on LBI drops

below the threshold voltage of 500mV.

Connect LBI to GND or VIN when low battery detector function is not

used.

Don’t leave this pin floating.

LBO

Open drain low battery detector output.

This Pin will be pulled low when the voltage on LBI drops below the

threshold voltage of 500mV.

An external pull-up resistor has to be connected between LBO and VOUT.