LP2951 datasheet(19/47 Pages) TI

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6 Detailed Description

6.1 Overview

The LP2951-Q1 is low-dropout voltage regulator that accommodates a wide input supply voltage range up

to 30V. The 8-pin LP2951-Q1 outputs 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 outputs a fixed

5V or 3.3V (depending on the version). Alternatively, by leaving the SENSE and VTAP pins unconnected and

connecting FEEDBACK to an external resistor divider, the output can be set to any value between 1.2V to 30V.

The LP2951-Q1 has a error flag output (ERROR) 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.

The LP2951-Q1 is stable with small ceramic output capacitors, allowing for a small overall solution size. The

LP2951-Q1 has an output tolerance of 1% across line, load, and temperature variation (new chip) and is capable

of delivering 100mA of continuous load current. This device includes integrated thermal shutdown, current limit,

and undervoltage lockout (UVLO) features. This device delivers excellent line and load transient performance.

The operating ambient temperature range of the device is –40°C to 125°C.

6.2 Functional Block Diagram

Bandgap

Reference

OUTPUT

Internal

Controller

Brick-wall

Current

Limit

Thermal

Shutdown

SHUTDOWN

Internal

Supply

UVLO

–

FEEDBACK

SENSE

VTAP

ERROR

GND

INPUT

www.ti.com

LP2951-Q1

SLVSAW6H – JUNE 2011 – REVISED NOVEMBER 2024

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