250mA Low Dropout Voltage Regulator

SP

X2954

1/15

REV1A

FEATURES

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5.0V and 3.3V versions at 250mA output

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Accurate 0.5% for SPX2954A

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Very low quiescent current

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Low dropout: 310mV at 250mA

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Extremely tight load and line regulation

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Very low temperature coefficient

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Current and thermal limiting

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Need only 1µF for stability

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Direct replacement for LP2954

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Error flag warns of output dropout

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Logic-controlled electronic shutdown

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Programmable output from 1.24V to 30V

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 a 3-pin SOT-223

package and an 8-pin SOIC package.

Typical Application

Typical Application

100K

OUTPUT

ERROR

ERROR

SD

VOUT

GND

FB

VIN

1.23V

1.2 to 30V

.01 F

3.3 F

3

8

5

1

4

7

SHUTDOWN

INPUT

+

SPX2954