LP2951-Q1 Automotive, Adjustable Micropower Voltage Regulator With Shutdown

1 Features

• AEC-Q100 qualified for automotive applications:

– Temperature grade 1: −40°C to +125°C, TA

– Temperature grade 1: −40°C to +125°C, TJ

• Wide input voltage range

– VIN range (new chip): 2V to 30V

• Wide output voltage range VOUT

– Fixed option: 3.3V, 5.0V

– Adjustable option: 1.2V to 29V

• Output current: Up to 100mA

• VOUT accuracy:

– ±2% over line, load, and temperature for legacy

chip

– ±1% over line, load, and temperature for new

chip

• Quiescent current IQ (new chip): 50μA (typical)

• Low dropout: 340mV (typical) for new chip

• Output current limiting and thermal shutdown

• Open-drain error output

• Stable over a wide range of ceramic output

capacitor values:

– CL range: 1μF to 100μF (new chip)

– ESR range: 0Ω to 2Ω (new chip)

• Package options:

– D (8-pin SOIC)

– DRG (8-pin WSON)

2 Applications

• Infotainment and clusters

• HEV/EV battery-management systems (BMS)

• HEV/EV inverters and motor controls

• HEV/EV onboard chargers (OBC) and wireless

chargers

• HEV/EV DC/DC converters

3 Description

The LP2951-Q1 is a wide input low-dropout regulator

(LDO) supporting an input voltage range from 2V to

30V and can supply up to 100mA of load current.

The LP2951-Q1 is able to output either a fixed or

adjustable output from the same device. By tying

the OUTPUT and SENSE pins together, and the

FEEDBACK and VTAP pins together, the LP2951-Q1

gives 3.3V or 5V fixed output voltages. Alternatively,

leave the SENSE and VTAP pins open and connect

FEEDBACK to an external resistor divider. This

configuration allows the output to be set to any value

between 1.2V to 29V.

The LP2951-Q1 has a ERROR output that monitors

the voltage at the feedback pin to indicate the status

of the output voltage. The SHUTDOWN input and

ERROR output are used for sequencing multiple

power supplies in the system.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

LP2951-33-Q1

DRG (WSON, 8)

3mm × 3mm

LP2951-50-Q1

LP2951-50-Q1

D (SOIC, 8)

4.9mm × 6mm

(1)

For more information, see the Section 10.

(2)

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

includes pins, where applicable.

-30

0

30

60

90

120

150

T

A- Temperature - °C

50

100

150

200

250

300

350

400

450

500

I

L= 50mA

I

L= 100mA

VIN = 4.9V

Dropout Voltage vs Temperature (New Chip)

LP2951

Load

VBAT

FB

1µF

1µF

OUTPUT

1

3

4

8

7

6

5

SENSE

SHUTDOWN

330K

INPUT

FEEDBACK

VTAP

ERROR

2

Typical Application Circuit

LP2951-Q1

SLVSAW6H – JUNE 2011 – REVISED NOVEMBER 2024

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.