1

2

3

4

8

7

6

5

INPUT

FEEDBACK

ERROR

OUTPUT

SENSE

SHUTDOWN

GND

LP2951

D OR P PACKAGE

(TOP VIEW)

OUTPUT

GND

INPUT

LP2950

LP PACKAGE

(BOTTOM VIEW)

LP2951

DRG PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

INPUT

FEEDBACK

V

TAP

ERROR

OUTPUT

SENSE

SHUTDOWN

GND

Thermal

Pad

LP2950

LP2951

www.ti.com

SLVS582F – APRIL 2006 – REVISED DECEMBER 2009

ADJUSTABLE MICROPOWER VOLTAGE REGULATORS

WITH SHUTDOWN

Check for Samples: LP2950, LP2951

1

FEATURES

•

Wide Input Range: Up to 30 V

•

Stable With Low ESR (>12 m

Ω) Capacitors

•

Rated Output Current of 100 mA

•

Current- and Thermal-Limiting Features

•

Low Dropout: 380 mV (Typ) at 100 mA

•

LP2950 Only (3-Pin Package)

•

Low Quiescent Current: 75

μA (Typ)

–

Fixed-Output Voltages of 5 V, 3.3 V, and 3 V

•

Tight Line Regulation: 0.03% (Typ)

•

LP2951 Only (8-Pin Package)

•

Tight Load Regulation: 0.04% (Typ)

–

Fixed- or Adjustable-Output Voltages:

5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ

•

–

Low-Voltage Error Signal on Falling Output

–

1.4% at 25°C

–

Shutdown Capability

–

2% Over Temperature

–

Remote Sense Capability for Optimal

•

Can Be Used as a Regulator or Reference

Output Regulation and Accuracy

DESCRIPTION/ORDERING INFORMATION

The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input

supply-voltage range of up to 30 V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages of 5 V,

3.3 V, and 3 V. However, the 8-pin LP2951 is able to output either a fixed or adjustable output from the same

LP2951 outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version). Alternatively, by leaving the SENSE and

between 1.235 V to 30 V.

The 8-pin LP2951 also offers additional functionality that makes it particularly suitable for battery-powered

applications. For example, a logic-compatible shutdown feature allows the regulator to be put in standby mode

for power savings. In addition, there is a built-in supervisor reset function in which the ERROR output goes low

thermal shutdown.

The LP2950 and LP2951 are designed to minimize all error contributions to the output voltage. With a tight

output tolerance (0.5% at 25°C), a very low output voltage temperature coefficient (20 ppm typical), extremely

good line and load regulation (0.3% and 0.4% typical), and remote sensing capability, the parts can be used as

either low-power voltage references or 100-mA regulators.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.