LP2951

© 1998 SEMTECH CORP.

150mA ADJUSTABLE

VOLTAGE REGULATOR

March 17, 1998

652 MITCHELL ROAD NEWBURY PARK CA 91320

1

DESCRIPTION

The LP2951 series of low power voltage regulators

have low quiescent current and low dropout voltage.

The quiescent current increases minimally during

dropout conditions thereby extending battery life.

Available in the 8 lead SOIC package, the LP2951 se-

ries includes features such as shutdown and low out-

put voltage detect (typically due to low battery condi-

tions). This function may also be used as a power on

reset function when triggered by CMOS or TTL inputs.

The circuit can be used as a fixed voltage 5 volt (3.3

volt for LP2951CM-3.3) regulator or adjusted between

1.24 volts and 29 volts using external resistor pairs.

FEATURES

AS2951C

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

PIN CONFIGURATION

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Maximum

Units

Supply Voltage

V

IN

-0.3 to 30

V

Shutdown Input

Voltage

-0.3 to 30

V

Error Comp. Output

Voltage

-0.3 to 30

V

Power Dissipation

P

D

Internally

Limited

W

Thermal Resistance

Junction to Ambient

θ

JA

175

°C/W

Operating Junction

Temperature Range

T

J

-40 to 125

°C

Storage

Temperature Range

T

STG

-65 to 150

°C

Lead Temperature

(Soldering) 5 Sec

T

LEAD

260

°C

APPLICATIONS

Notes:

(1) Where -X.X denotes voltage options. Available

voltages are: 3.3V (-3.3) and 5V (leave blank).

(2) Add suffix ‘TR’ for tape and reel.

ORDERING INFORMATION

DEVICE

(1)(2)

OUTPUT

PACKAGE

LP2951CM-X.X

ADJ

SO-8