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LP2981x 100mA, Low-Dropout Regulator in SOT-23 Package

1 Features

•Input voltage (V

IN

) range:

–Legacy chip: 2.2V to 16V

–New chip: 2.5V to 16V

•Output voltage (V

OUT

) range: 1.2V to 5.0V

•Output voltage (V

OUT

) accuracy:

–±0.75% for A-grade legacy chip

–±1.25% for standard-grade legacy chip

–±0.5% for new chip (A-grade and standard

grade)

•Output Voltage (V

OUT

) accuracy over load, and

temperature: ±1% (new chip)

•Output current: Up to 100mA

•Low I

Q

(new chip): 69μA at I

LOAD

= 0mA

•Low I

Q

(new chip): 620μA at I

LOAD

= 100mA

•Shutdown current over temperature:

–< 1μA (legacy chip)

–≤ 1.75μA (new chip)

•Output current limiting and thermal protection

•Stable with 2.2µF ceramic capacitors (new chip)

•High PSRR (new chip):

–75dB at 1kHz, 45dB at 1MHz

•Operating junction temperature: –40°C to +125°C

•Package: 5-pin SOT-23 (DBV)

2 Applications

•Electricity meters

•Micro inverters

•Server PSU (12V output)

•Residential breakers

•Single and multiaxis servo drives

3 Description

The LP2981 and LP2981A (LP2981x) are fixed-

output, low-dropout (LDO) voltage regulators

supporting an input voltage range from 2.5V to 16V

(for new chip only) and up to 100mA of load current.

The LP2981x support an output range of 1.2V to 5.0V

(new chip).

Additionally, the LP2981x (new chip) has a ±1%

output accuracy across load and temperature that

can meet the needs of low-voltage microcontrollers

(MCUs) and processors.

In the new chip, wide bandwidth PSRR performance

is 75dB at 1kHz and 45dB at 1MHz to help attenuate

the switching frequency of an upstream DC/DC

converter and minimize post regulator filtering.

In the new chip, the internal soft-start mechanism

reduces inrush current during start up, thus

minimizing input capacitance. Standard protection

features, such as overcurrent and overtemperature

protection, are included.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LP2981xDBV (SOT-23, 5)2.9mm × 2.8mm

(1)For more information, see the Mechanical, Packaging, and

Orderable Information.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

INOUT

ON/

OFF

LP2981

GND

C

IN

GND

GND

C

OUT

GND

V

IN

V

OUT

Typical Application Circuit

TEMPERATURE(C)

V

DROP

(mV)

-75-50-250255075100125150

0

50

100

150

200

250

300

I

L

(mA)

0

1

25

100

Dropout Voltage vs Temperature (New Chip)

LP2981, LP2981A

SLVS521I – JULY 2004 – REVISED FEBRUARY 2025

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.

Produktspecifikationer