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SPX1121
(Rev.:2002)

150mA Low Dropout Voltage Regulator

Signal Processing Technologies 

®

SPX1121

150mA Low Dropout Voltage Regulator

FEATURES

■ 5.0V and 3.3V output versions

■ 1% Output Accuracy

■ Very Low Quiescent Current

■ Low Dropout: 300mV @ 150mA

■ Very Tight Load & Line Regulation

■ Very Low Temperature Coefficient

■ Current and Thermal Limiting

■ Requires only 1µF for Stability

■ Equivalent Replacement for LT1121

■ Industry Standard SOT-223 and TO-92

3 lead packages

VOUT

IIN

+

0.1µF

IIN = IL + IG

IN

OUT

SPX1121

GND

IG

5V

IL

+

2.2µF

LOAD

Figure 1. Fixed +5V Regulator Circuit

DESCRIPTION

The SPX1121 is a low power voltage regulator. It is an excellent choice for use in battery-powered

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

SPX1121 features very low quiescent current and low dropout voltage (typ. 20mV at 100µA and

300mV at 150mA). A tight initial tolerance (1%), extremely good load and line regulation (0.05%

typ.), and very low output temperature coefficient (20 ppm/°C typ.), make the SPX1121 useful

as a low power voltage reference.

PACKAGES

SOT-223 Package (M3)

SPX1121

1

2

3

V GND V

IN

OUT

Front View

TO-92 (N)

12 3

OUTPUT

GND

Bottom View

INPUT

Rev. 10/11/02

SPX1121 150mA Low DropoutVoltage Regulator

1

© Copyright 2002 Sipex Corporation

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