100mA Low Dropout

Voltage Regulators

LP2950 / LP2951

FEATURES

LP2951 Versions Only

APPLICATIONS

PRODUCT DESCRIPTION

The Calogic LP2950 and LP2951 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 LP2950

and LP2951 features very low quiescent current and very low

dropout voltage (Typ. 50mV at light load and 380mV at 100mA).

This includes a tight initial tolerance of 0.5% typ., extremely

good load and line regulation 0.05% typ. and very low output

temperature coefficient, making the LP2950/LP2951 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 falling voltage input of

batteries. Another feature is the logic-compatible shutdown

input which enables the regulator to be switched on and off.

The LP2950 is offered in a 3-pin TO-92 package compatible

with other 5V, 3.0V, 3.3V regulators. The LP2951 is also available

in 8-pin plastic and SO-8.

The regulator output voltage may be pin-strapped for 5V, 3V

or 3.3 volts or programmed from 1.24 volt to 29 volts with an

external pair of resistors. Use of AS’s design, processing and

testing techniques make our LP2950 and LP2951 superior

over similar products.

ORDERING INFORMATION

PART

PACKAGE

TEMPERATURE RANGE

LP2950ACN-X

TO-92 (3-Pin)

IND.

LP2950CN-X

TO-92 (3-Pin)

IND.

LP2951ACP-X

Plastic DIP (8-Pin)

IND.

LP2951CP-X

Plastic DIP (8-Pin)

IND.

LP2951ACS-X

Plastic SOIC (8-Pin)

IND.

LP2951CS-X

Plastic SOIC (8-Pin)

IND.

X = 3.0V, 3.3V or 5.0V

CORPORATION

PIN CONNECTIONS

1D-20

123

1. OUTPUT

2. GROUND

3. INPUT

TO-92

BOTTOM VIEW

GROUND

1

2

3

8

7

6

4

5

ERROR

LP2951

1D-19

8-PIN SURFACE MOUNT

5V OR 3.3V TAP

FEEDBACK

INPUT

SHUTDOWN

SENSE

OUTPUT

TOP VIEW

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025