Current

Limit

IN

OUT

EN

Control

EN

Output

Discharge

140-µs

DELAY

PG

GND

3 M

100

Copyright © 2016, Texas Instruments Incorporated

EA

+

±

45 k

17

LP5912

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SNVSA77B – DECEMBER 2015 – REVISED JUNE 2016

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8 Detailed Description

8.1 Overview

The LP5912 is a low-noise, high PSRR, low-dropout regulator capable of sourcing a 500-mA load. The LP5912

can operate down to 1.6-V input voltage and 0.8-V output voltage. This combination of low noise, high PSRR,

and low output voltage makes the device an ideal low dropout (LDO) regulator to power a multitude of loads from

noise-sensitive communication components to battery-powered system.

The LP5912 Functional Block Diagram contains several features, including:

•

Internal output resistor divider feedback;

•

Small size and low-noise internal protection circuit current limit;

•

Reverse current protection;

•

Current limit and in-rush current protection;

•

Thermal shutdown;

•

Output auto discharge for fast turnoff; and

•

Power-good output, with fixed 140-µs typical delay.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Enable (EN)

The LP5912 EN pin is internally held low by a 3-M

Ω resistor to GND. The EN pin voltage must be higher than the

discharge is activated.

When the device is disabled the output stage is disabled, the PG output pin is low, and the output automatic

discharge is ON.