1

Rev. 3/6/03

SP2954 250mA Low Dropout Voltage Regulator

© Copyright 2003 Sipex Corporation

250mA Low Dropout Voltage Regulator

SPX2954

DESCRIPTION

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

®

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.

100K

OUTPUT

ERROR

ERROR

______

SD

GND

FB

1.23V

1.2 to 30V

.01µF

3.3µF

3

8

5

1

4

7

SHUTDOWN

INPUT

+

SPX2954

Adjustable Regulator

Pin Connections

TO-263-5 Package (T5)

Top View

45

SPX2954

TO-263-3 Package (T)

GND

GND

SHUTDOWN

ERROR

1)

3)

4)

5)

2) OUTPUT

INPUT

SPX2954

Top View

12

3

3

2

1

V

OUT

V

IN

Top View

2

1

3

4

8

7

6

5

SPX2954

SHUTDOWN

GND

INPUT

5V, 3.3V TAP

ERROR

FEEDBACK

SENSE

OUTPUT

8-Pin Surface Mount (S)

Bottom View

13

2

OUTPUT

GND

INPUT

TO-92 (N)

SPX2954

13

2

V

OUT

GND

SOT-223 Package (M3)

Front View

V

IN

TO-220-5 Package (U5)

Front View

SPX2954

GND

SHUTDOWN

ERROR

1)

3)

4)

5)

2) OUTPUT

INPUT

12 3 4 5

Front View

TO-220-3 Package (U)

SPX2954

12

3

V

IN

V

OUT

GND