1

Rev: A Date: 03/30/04

SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown

©Copyright 2004 Sipex Corporation

SPX2920

FEATURES

■ Output 3.3V, 5.0V, at 400mA Output

■ Very Low Quiescent Current

■ Low Dropout Voltage

■ Extremely Tight Load And Line Regulation

■ Very Low Temperature Coefficient

■ Current & Thermal Limiting

■ Error Flag Warns Of Output Dropout

(for SO-8)

■ Logic-Controlled Electronic Shutdown

(for SO-8)

■ Output Programmable From 1.24V to 20V

(for SO-8)

■ Equivalent Replacement for MIC2920A and

MIC2904

®

The SPX2920 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 SPX2920

features very low quiescent current (140µA Typ.) and very low dropout voltage. This includes a tight initial

tolerance of 1% max and very low output temperature coefficient, making the SPX2920 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 SPX2920 is offered in 3-pin TO-220 package, SO-8 (same pin

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

The regulator output voltage (of the 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.

400mA Low Drop Out Voltage Regulator with Shutdown

Front View

TO-220-3 (U)

SPX2920

123

V

IN

TO-263-3 (T)

Top View

1

SPX2920

2

3

V

OUT

GND

V

IN

V

OUT

GND

Top View

2

1

3

4

8

7

6

5

SPX2920

8-Pin Surface Mount

Top View

SPX2920

13

2

SOT-223 (M3)

V

OUT

SENSE

SHUTDOWN

GND

V

IN

FEEDBACK

5V/ 3.3V TAP

ERROR

V

IN

100K

ERROR

______

SD

V

OUT

GND

FB

+V

IN

0.01µF

3

8

1

4

7

SHUTDOWN

INPUT

SPX2920

OFF

ON

+V

IN

5

10µF

V

REF

R

2

R

1

+

ERROR

OUTPUT

1.2V to 20V

+

2.2 µF

+

SPX2920

V

IN

5V

IN

GND

OUT

IG

0.1 µF

Adjustable Regulator

5V Regulator Circuit

DESCRIPTION