LP2954/LP2954A

5V and Adjustable Micropower Low-Dropout Voltage

Regulators

General Description

The LP2954 is a 5V micropower voltage regulator with very

low quiescent current (90 µA typical at 1 mA load) and very

low dropout voltage (typically 60 mV at light loads and

470 mV at 250 mA load current).

The quiescent current increases only slightly at dropout

(120 µA typical), which prolongs battery life.

The LP2954 with a fixed 5V output is available in the

three-lead TO-220 and TO-263 packages. The adjustable

LP2954 is provided in an 8-lead surface mount, small outline

package. The adjustable version also provides a resistor net-

work which can be pin strapped to set the output to 5V.

Reverse battery protection is provided.

The tight line and load regulation (0.04% typical), as well as

very low output temperature coefficient make the LP2954

well suited for use as a low-power voltage reference.

Output accuracy is guaranteed at both room temperature

and over the entire operating temperature range.

Features

n 5V output within 1.2% over temperature (A grade)

n Adjustable 1.23 to 29V output voltage available

(LP2954IM and LP2954AIM)

n Guaranteed 250 mA output current

n Extremely low quiescent current

n Low dropout voltage

n Reverse battery protection

n Extremely tight line and load regulation

n Very low temperature coefficient

n Current and thermal limiting

n Pin compatible with LM2940 and LM340 (5V version

only)

n Adjustable version adds error flag to warn of output drop

and a logic-controlled shutdown

Applications

n High-efficiency linear regulator

n Low dropout battery-powered regulator

Package Outline and Ordering Information

TO-220 3–Lead Plastic Package

DS011128-2

Front View

Order Number LP2954AIT or LP2954IT

See NS Package T03B

SO-8 Small Outline Surface Mount

DS011128-33

Top View

Order Number LP2954AIM or LP2954IM

See NS Package M08A

June 1999

© 1999 National Semiconductor Corporation

DS011128

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