Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Jun., 2013

www.anpec.com.tw

7

APW7290

Pin Description

PIN

NO.

NAME

Function

1

GND

Power and Signal Ground.

2

VIN

Device and Converter Supply Pin. Must be closely decoupled to GND with a 4.7

µF or greater ceramic

capacitor.

3

RUN

Enable Control Input. Forcing this pin above 1.0V enables the device. Forcing this pin below 0.4V shuts

it down. In shutdown, all functions are disabled to decrease the supply current below 0.5µA. Do not

leave RUN pin floating.

4

LBI

Low-battery comparator input. Internally set to trip at 0.6V.

5

FB

Feedback Input Pin and output voltage select Pin. The buck regulator senses feedback voltage via FB

and regulates the FB voltage at 0.6V. Connecting FB with a resistor-divider from the output sets the

output voltage of the buck converter. If FB connects to GND, VOUT is fixed 1.8V.

6

VOUT

Output Voltage. Output voltage feedback input if FB pin is connected to VOUT or GND.

7

SW

Switch Node Connected to Inductor. This pin connects to the drains of the internal main and

synchronous power MOSFETs switches.

8

LBO

Open-drain low battery comparator output. Connect LBO to OUT through a 100k

Ω resistor. LBO is low

Block Diagram

Oscillator

Logic Control

SW

Over-

Temperature

Protection

0.6V

EAMP

COMP

ICMP

Soft-

start

Error

Amplifier

Zero-Crossing

Comparator

Current

Limit

Slope

Compensation

VIN

Current Sense

Amplifier

Shutdown

Control

∑

FB

RUN

GND

Gate

Driver

VOUT

VOUT

Selector

0.6V

LBI

LBO