1

Date: 5/25/04

SPX1129 400mA Low Dropout Voltage Regulator

©Copyright 2004 Sipex Corporation

SPX1129

DESCRIPTION

FEATURES

■ 1% Output Accuracy 3.3V, 5V,

at 500mA Output

■ Very Low Quiescent Current

■ 0.42V Dropout Voltage at 400mA

■ Extremely Tight Load and Line Regulation

■ Current & Thermal Limiting

■ Reverse Battery Protection

■ Equivalent Replacement For LT1129

APPPLICATIONS

■ Power Supply

■ Communications Equipment

■ Computers and Peripherals

®

The SPX1129 is a low power voltage regulator. This device is an excellent choice for use in battery-powered

applications such as cordless telephones, radio control systems, and portable computers. The SPX1129

features very low quiescent current and very low dropout voltage of 0.42 volts. This includes a tight initial

tolerance of ±1% max, and a very low output temperature coefficient, making the SPX1129 useful as a low-

power voltage reference.

The SPX1129 is offered in a SOT-223, TO-220, TO-252 & TO-263 3 lead packages.

400mA Low Dropout Voltage Regulator

+

2.2µF

+

SPX1129

I

IN

I

G

I

L

5V

IN

OUT

GND

LOAD

I

V

IN

0.1µF

Fixed +5V Regulator Circuit..

TYPICAL APPLICATION CIRCUIT

GND

V

OUT

V

IN

3

2

1

SPX1129

3 Pin TO-220

12

3

SPX1129

3 Pin TO-263

GND

V

IN

V

OUT

V

OUT

GND

V

IN

TO-252

3

2

1

SPX1129

12

3

SPX1129

3 Pin TO-263

GND

V

IN

V

OUT

Now Available in Lead Free Packaging