AP138

300mA Low-Noise CMOS LDO

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. 1.0 Oct 29, 2004

1/7

Features

- Very low dropout voltage

- Low current consumption: Typ.30µA, Max. 35µA

- Output voltage: 1.8V, 2.5V, 2.8V, 3.0V and 3.3V

- High accuracy output voltage:

±1.5%

- Guaranteed 300mA output

- Input range up to 7.0V

- Thermal shutdown

- Current limiting

- Stability with low ESR capacitors

- Factory pre-set output voltages

- Low temperature coefficient

- Pb-free package: SOT23-5L

Applications

- Battery-powered devices

- Personal communication devices

- Home electric/electronic appliances

- PC peripherals

General Descriptions

The AP138 is a positive voltage linear regulator

utilizing CMOS technology. The features that

include low quiescent current (30µA typ.), low

dropout voltage, and high output voltage accuracy,

make it ideal for battery applications. EN input

connected to CMOS has low bias current. The

space-saving SOT23-5L package is attractive for

“Pocket” and “Hand Held” applications.

This rugged device has both thermal shutdown, and

current limit protections to prevent device failure

under the “Worst” operating conditions.

In a low noise, regulated supply application, a

1000pF capacitor is necessary to be placed in

between Bypass and Ground.

The AP138 is stable with a low ESR output

capacitor of 1.0µF or greater.

Pin Assignments

1

3

2

5

4

BYP

V

IN

EN

GND

V

OUT

AP138

SOT23-5

(Top View)

Pin Descriptions

Pin

Name

Pin

No.

Function

1

Power Supply

GND

2

Ground

EN

3

Enable Pin

BYP

4

Bypass Signal Pin

5

Output

Ordering Information

AP138 XX X X

W : SOT23-5L

Output voltage

Package

18: 1.8V

25: 2.5V

28: 2.8V

30: 3.0V

33: 3.3V

Blank: Tube

A: Taping

Packing