AP1187

1A Ultra Low Dropout Positive Adjustable Regulator

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev.1.1 Aug 23, 2005

1/6

Features

•

Adjustable output voltage

•

0.6V Maximum Dropout voltage at 1.0A Load

current

•

Built-in Thermal Shutdown

•

Output Current Limiting

•

Fast transient response

•

Good noise rejection

•

Package: SOP-7L

Applications

•

PC Motherboard

•

LCD Monitor

•

Graphic Card

•

DVD-Video Player

•

NIC/Switch

•

Telecom Equipment

•

ADSL Modem

•

Printer and other Peripheral Equipment

General Description

AP1187 is a 1A regulator with extremely low

dropout voltage. This product is specifically

designed to provide well regulated supply for

applications requiring 2.8V or lower voltages from

3.3V ATX power supplies where high efficiency of a

switcher can be achieved without the cost and

complexity associated with switching regulator. One

such application is the new graphic chip sets that

require anywhere from 2.4V to 2.7V supply.

Pin Assignments

1

2

3

4

7

6

5

NC

SOP-7L

AP1187

( Top View )

V

SENSE

ADJ

V

IN

V

CTRL

V

OUT

V

IN

Pin Descriptions

Name

Description

ADJ

pin and ground sets the output voltage.

This pin is the positive side of the

reference

that

allows

remote

load

sensing

to

achieve

excellent

load

regulation. A minimum of 10uF capacitor

must be connected from this pin to

ground to insure stability.

The input of the regulator.

This pin is the supply pin for the internal

control circuit as well as the base drive

for the pass transistor.

NC

Not used.

The output of the regulator.