AP1122

1A LOW DROPOUT POSITIVE REGULATOR

AP1122

Document number: DS31012 Rev. 9 - 2

2 of 11

www.diodes.com

May 2010

© Diodes Incorporated

Typical Application Circuit

C2

100uF

2.5V

1.2V/1A

GND

C1

100uF

Pin Descriptions

Pin Name

I/O

Pin #

Description

GND

I

1

Ground Pin

O

2

The output of the regulator. A minimum of 10uF capacitor (0.15

Ω ≤ ESR ≤ 20Ω)

must be connected from this pin to ground to insure stability.

I

3

The input pin of regulator. Typically a large storage capacitor is connected from

this pin to ground to insure that the input voltage does not sag below the

minimum dropout voltage during the load transient response.

Functional Block Diagram

3

Thermal

Shutdown

1

2

GND

1.2V

+

+

CURRENT

LIMIT

+

+