LP2985-N 150-mA, Low-Noise, Low-Power, Ultra-Low-Dropout Regulator in a SOT-23

Package

1 Features

• VIN range: 2.5 V to 16 V

• VOUT range (new chip):

– 1.2 V to 5.0 V (fixed, 100-mV steps)

• VOUT range (legacy chip): 2.5 V to 6.1 V

• VOUT accuracy:

– ±1% for A-grade legacy chip

– ±1.5% for standard-grade legacy chip

– ±0.5% for new chip only

• Output accuracy over load, and temperature:

– ±1% for new chip

• Output current: Up to 150 mA

• Low IQ (new chip): 71 μA at ILOAD = 0 mA

• Low IQ (new chip): 750 μA at ILOAD = 150 mA

• Shutdown current:

– 0.05 μA (typ) for legacy chip

– 1.12 μA (typ) for new chip

• Low noise: 30 μVRMS with 10-nF bypass capacitor

• Output current limiting and thermal protection

• Stable with 2.2-µF ceramic capacitors

• High PSRR: 70 dB at 1 kHz, 40 dB at 1 MHz

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

• Package: 5-pin SOT-23 (DBV) ultra-low dropout

voltage

2 Applications

• Washers and dryers

• Land mobile radios

• Active antenna system mMIMO

• Cordless power tools

• Motor drives and control boards

3 Description

The LP2985-N is a fixed-output, wide-input, low-noise,

low-dropout voltage regulator supporting an input

voltage range from 2.5 V to 16 V and up to 150 mA of

load current. The LP2985-N supports an output range

of 1.2 V to 5.0 V (new chip) and 2.5 V to 6.1 V (legacy

chip).

Additionally, the LP2985-N (new chip) has a 1%

output accuracy across load and temperature that

can meet the needs of low-voltage microcontrollers

(MCUs) and processors.

Low output noise of 30 µVRMS (with 10-nF bypass

capacitors) and wide bandwidth PSRR performance

of greater than 70 dB at 1 kHz and 40 dB at 1 MHz

help attenuate the switching frequency of an upstream

DC/DC converter and minimize post regulator filtering.

The internal soft-start time and current-limit protection

reduce inrush current during start up, thus minimizing

input capacitance. Standard protection features, such

as overcurrent and overtemperature protection, are

included.

The LP2985-N is available in a 5-pin, 2.9-mm × 1.6-

mm SOT-23 (DBV) package.

Package Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

LP2985-N

DBV (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.

Temperature (°C)

-75

-50

-25

0

25

50

75

100

125

150

0

50

100

150

200

250

300

350

400

450

Iout

1mA

10mA

50mA

150mA

Dropout Voltage vs Temperature for New Chip

IN

OUT

ON/

OFF

BYPASS

LP2985

GND

C

IN

GND

GND

GND

C

OUT

GND

10 nF

V

IN

V

OUT

Typical Application Circuit

LP2985-N

SNVS018Z – MARCH 2000 – REVISED MAY 2023

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.