LP2950*/2951

100mA Low-Dropout Voltage Regulator

* LP2950 Discontinuance September 2007.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

September 2008

M9999-091208

General Description

The LP2950 and LP2951 are micropower voltage

regulators with very low dropout voltage (typically 40mV at

light loads and 380mV at 100mA), and very low quiescent

current (75A typical). The quiescent current of the LP2950

/LP2951 increases only slightly in dropout, thus prolonging

battery life. This feature, among others, makes the LP2950

and LP2951 ideally suited for use in battery-powered

systems.

Available in a 3-pin TO-92 package, the LP2950 is pin-

compatible with the older 5V regulators. Additional system

functions, such as programmable output voltage and logic-

controlled shutdown, are available in the 8-pin DIP and 8-

pin SOIC versions of the LP2951.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• High accuracy 5V, guaranteed 100mA output

• Extremely low quiescent current

• Low-dropout voltage

• Extremely tight load and line regulation

• Very low temperature coefficient

• Use as regulator or reference

• Needs only 1µF for stability

LP2951 Versions Only

• Current and thermal limiting

• Error flag warns of output dropout

• Logic-controlled electronic shutdown

• Output programmable from 1.24 to 29V

Applications

• Automotive electronics

• Voltage reference

• Avionics

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Block Diagram

LP2590 and LP2951 Block Diagram

(Pin Numbers Refer to LP2591)