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2945M3

400mA Low Dropout Voltage Regulator with Shutdown

Signal Processing Technologies 

®

SPX2945

400mA Low Dropout Voltage Regulator with Shutdown

FEATURES

■ Output 3.3V, 5.0V at 400mA Output

■ Very Low Quiescent Current, 100µA

■ Low Dropout Voltage, 420mV at 400mA

■ Extremely Tight Load and Line Regulation

■ Very Low Temperature Coefficient

■ Current & Thermal Limiting

■ Error Flag Warns Of Output Dropout

■ Logic-Controlled Electronic Shutdown

■ Output Programmable From 1.24V to 20V

(for SO-8)

+VIN

100K

SHUTDOWN

INPUT

OFF

ON

8 +VIN

1

VOUT

SPX2945 FB 7

SD

3

______

ERROR

GND

5

4

1.2V to 20V

+

R1 0.01µF 10µF

VREF

R2

ERROR

OUTPUT

Adjustable Regulator

VIN

+

0.1 µF

IN

OUT

SPX2945

GND

5V

+

2.2 µF

5V Regulator Circuit

DESCRIPTION

The SPX2945 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 SPX2945

features very low quiescent current (100µA Typ.) and very low dropout voltage. This includes a tight initial

tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low-

power voltage reference.

The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling

voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the

regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pin

out as SPX2951), SOT-223, surface mount 3-Pin TO-252, 3-Pin TO-263 packages and 5-Pin TO-263.

The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed

from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA

applications.

TO-220-3 (U)

TO-263-3 (T)

TO-263-5 (T5)

TO-252 (R)

8-Pin Surface Mount(S)

SOT-223 (M3)

SPX2945

123

SPX2945

1 23

VIN GN VOU

SPX2945

5 Pin TO-263

1 2345

SPX2945

1 23

VIN GN VOU

VOU

SENS

SHUTDOWN

GN

1

8

SPX2945

2

7

3

6

4

5

VIN

FEEDBACK

5V/ 3.3V TAP

ERRO

SPX2945

1 23

VIN GN VOU

VIN GN VOU

Rev. B Date:01/20/04

SPX2945 400mA Low Dropout Voltage Regulator with Shutdown

1

©Copyright 2004 Sipex Corporation

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