LP2985 150-mA, Low-Noise, Low-Dropout Regulator With Shutdown

1 Features

• VIN range (new chip): 2.5 V to 16 V

• VOUT range (new chip): 1.2 V to 5.0 V (fixed, 100-

mV steps)

• VOUT accuracy:

– ±1% for A-grade legacy chip

– ±1.5% for standard-grade legacy chip

– ±0.5% for new chip only

• ±1% output accuracy over load, and temperature

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:

– 0.01 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)

2 Applications

• Washer and dryer

• Land mobile radio

• Active antenna system mMIMO

• Cordless power tool

• Motor drives and control boards

3 Description

The LP2985 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 supports an output range of

1.2 V to 5.0 V (for new chip).

Additionally, the LP2985 (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 is available in a 5-pin 2.9-mm × 1.6-mm

SOT-23 (DBV) package.

Package Information(1)

PART

NUMBER

PACKAGE

BODY SIZE (NOM)

LP2985

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

SLVS522Q – JULY 2004 – REVISED DECEMBER 2022

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.