DATA SHEET

www.onsemi.com

© Semiconductor Components Industries, LLC, 1995

February, 2023 − Rev. 35

1

Publication Order Number:

LP2950/D

Voltage Regulator - Low

Power Low, Dropout

100 mA

LP2950, LP2951, NCV2951

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

mA 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, SOIC−8 and Micro8 surface mount packages.

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

±0.5%.

Features

• Low Quiescent Bias Current of 75 mA

• Low Input−to−Output Voltage Differential of 50 mV at 100 mA and

380 mV at 100 mA

• 5.0 V, 3.3 V or 3.0 V ±0.5% Allows Use as a Regulator or Reference

• Extremely Tight Line and Load Regulation

• Requires Only a 1.0 mF Output Capacitor for Stability

• Internal Current and Thermal Limiting

• NCV Prefix for Automotive and Other Applications Requiring

Unique Site and Control Change Requirements; AEC−Q100

Qualified and PPAP Capable

• These Devices are Pb−Free and RoHS Compliant

LP2951 Additional Features

• Error Output Signals an Out of Regulation Condition

• Output Programmable from 1.25 V to 29 V

• Logic Level Shutdown Input

(See Following Page for Device Information.)

TO−92

CASE 29−10

See detailed ordering and shipping information in the package

dimensions section on pages 14 and 15 of this data sheet.

PIN CONNECTIONS

Pin: 1. Output

2. Ground

3. Input

DPAK

CASE 369C

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

SOIC−8

CASE 751

PDIP−8

CASE 626

Micro8

CASE 846A

1 2

3

4

1 2

3

1

2

BENT LEAD

STRAIGHT LEAD

3

See general marking information in the device marking

section on page 16 of this data sheet.

ORDERING INFORMATION

DEVICE MARKING INFORMATION