© Semiconductor Components Industries, LLC, 1999

October, 1999 – Rev. 5

1

Publication Order Number:

LP2950/D

LP2950

Micropower Voltage

Regulators

The LP2950 and LP2951 are micropower voltage regulators that are

specifically designed to maintain proper regulation with an extremely

low input–to–output voltage differential. These devices feature a very

low quiescent bias current of 75

µA and are capable of supplying

output currents in excess of 100 mA. Internal current and thermal

limiting protection is provided.

The LP2951 has three additional features. The first is the Error

Output that can be used to signal external circuitry of an out of

regulation condition, or as a microprocessor power–on reset. The

second feature allows the output voltage to be preset to 5.0 V, 3.3 V or

3.0 V output (depending on the version) or programmed from 1.25 V

to 29 V. It consists of a pinned out resistor divider along with direct

access to the Error Amplifier feedback input. The third feature is a

Shutdown input that allows a logic level signal to turn–off or turn–on

the regulator output.

Due to the low input–to–output voltage differential and bias current

specifications, these devices are ideally suited for battery powered

computer, consumer, and industrial equipment where an extension of

useful battery life is desirable. The LP2950 is available in the three

pin case 29 and DPAK packages, and the LP2951 is available in the

eight pin dual–in–line, SO–8 and Micro–8 surface mount packages.

The ‘A’ suffix devices feature an initial output voltage tolerance

±0.5%.

LP2950 and LP2951 Features:

380 mV at 100 mA

LP2951 Additional Features:

(See Following Page for Device Information.)

TO–92

Z SUFFIX

CASE 29

http://onsemi.com

See detailed ordering and shipping information in the package

dimensions section on page 13 of this data sheet.

ORDERING INFORMATION

PIN CONNECTIONS

2

3

1

Pin: 1. Output

2. Ground

3. Input

DPAK

DT SUFFIX

CASE 369A

3

1

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

12

3

(Top View)

Pin: 1. Input

2. Ground

3. Output

8

1

8

1

8

1

PIN CONNECTIONS

18

7

6

5

2

3

4

(Top View)

Output

Sense

Shutdown

Input

Feedback

Error Output

VO Tap

Gnd

SO–8

D SUFFIX

CASE 751

N SUFFIX

CASE 626

Micro–8

DM SUFFIX

CASE 846A