SPX2954AM3-3.3(2003) Просмотр технического описания (PDF) - Signal Processing Technologies

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SPX2954AM3-3.3
(Rev.:2003)

250mA Low Dropout Voltage Regulator

Signal Processing Technologies 

®

SPX2954

250mA Low Dropout Voltage Regulator

FEATURES

■ 5.0V and 3.3V Versions at 250mA

Output

■ Accurate 0.5% for SPX2954A

■ Very Low Quiescent Current

■ Low Dropout: 310mV at 250mA

■ Extremely Tight Load and Line Regulation

■ Very Low Temperature Coefficient

■ Current and Thermal Limiting

■ Need only 1µF for Stability

■ Direct Replacement for LP2954

■ Offered in TO-92, TO-263, SOT-223,

TO-220 and SOIC

8 Pin Versions Only

■ Error Flag Warns of Output Dropout

■ Logic-Controlled Electronic Shutdown

■ Programmable Output from 1.24V to 30V

+V IN

100K

ERROR

OUTPUT

8

5 ______ +VIN

ERROR

1

V OUT

SPX2954

SHUTDOWN

INPUT

3

SD

GND

4

FB

7

1.23V

1.2 to 30V

+

R1

3.3µF

.01µF

VREF

R2

Adjustable Regulator

DESCRIPTION

The SPX2954 and SPX2954A are low power voltage regulators. These devices are an excellent

choice for use in battery-powered applications such as cordless telephones, radio control

systems, and portable computers. The SPX2954 and SPX2954A feature low quiescent current

and low dropout voltage (typ. 20mV at 100µA and 310mV at 250mA). This includes a tight initial

tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very

low output temperature coefficient (20 ppm/°C typ.), making the SPX2954/SPX2954A useful as

a low-power voltage reference.

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

to a falling input voltage. The logic-compatible shutdown feature enables the regulator to be

switched ON and OFF. The SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223

and TO-220 packages, and 8 pin SOIC package.

TO-263-3 Package (T) TO-263-5 Package (T8-5P) in Surface Mount (S)

OUTPUT

1

8

INPUT

SPX2954

1

23

VIN GND VOUT

Top View

SPX2954 SENSE

2

7

SPX2954

1 2SH3UT4DO5WN 1) INPU3T

6

2) OUTPUT

GND 3) GND4

5

4) SHUTDOWN

5) ERROTRop View

Top View

FEEDBACK

5V, 3.3V TAP

ERROR

TO-92 (N)

12 3

OUTPUT

GND

Bottom View

INPUT

SOT-223 Package (M3)

SPX2954

123

V GND V

IN

OUT

Front View

TO-220-3 Package (U) TO-220-5 Package (U5)

SPX2954

1 23

VIN GND VOUT

Front View

SPX2954

1 2 34 5

1) INPUT

2) OUTPUT

3) GND

4) SHUTDOWN

5) ERROR

Front View

Pin Connections

Rev. 3/6/03

SP2954 250mA Low Dropout Voltage Regulator

1

© Copyright 2003 Sipex Corporation

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