VIN

VOUT

GND

ON/OFF

VREF

1.23 V

í

+

R 1

R 2

Overcurrent/

Overtemperature

Protection

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LP2981-28, LP2981-29, LP2981-30

LP2981-33, LP2981-50, LP2981A-28

LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50

SLVS521G – JULY 2004 – REVISED AUGUST 2016

LP2981 100-mA Ultra-Low Dropout Regulators With Shutdown

1

1 Features

1

•

Output Tolerance of

–

0.75% (A Grade)

–

1.25% (Standard Grade)

•

Ultra-Low Dropout Typically:

–

200 mV at Full Load of 100 mA

–

7 mV at 1 mA

•

•

Shutdown Current: 0.01 µA Typical

•

Fast Transient Response to Line and Load

•

Overcurrent and Thermal Protection

•

High Peak Current Capability

•

•

−40°C to 125°C Temperature Range

2 Applications

•

Smart Meters

•

Servo and Motor Control

•

Mobile Phones and Cameras

•

Audio and Portable Speakers

•

Telecommunication and Networking

3 Description

The LP2981 and LP2981A families of fixed-output,

low-dropout

regulators

offer

exceptional,

cost-

effective performance for both portable and non-

portable applications. Available in fixed voltages of

2.8 V, 3 V, 3.3 V, and 5 V, the family has an output

tolerance of 0.75% for the A-grade devices (1.25%

for the standard grade) and is capable of delivering

100-mA continuous load current. Standard regulator

features, such as overcurrent and overtemperature

protection, are included.

The LP2981 and LP2981A have features that make

the regulators ideal candidates for a variety of

portable applications:

•

Low dropout: A PNP pass element allows a typical

dropout of 200 mV at 100-mA load current and 7

mV at 1-mA load.

•

Low quiescent current: The use of a vertical PNP

process allows for quiescent currents that are

considerably lower than those associated with

traditional lateral PNP regulators.

•

Shutdown:

A

shutdown

feature

is

available,

allowing the regulator to consume only 0.01 µA

when the ON/OFF pin is pulled low.

Device Information(1)

PART NUMBER

PACKAGE (PINS)

BODY SIZE (NOM)

LP2981-XXDBV

LP2981A-XXDBV

SOT-23 (5)

2.90 mm × 1.60 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Block Diagram