7 Detailed Description

7.1 Overview

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

The LP5912-EP can operate down to a 1.6-V input voltage and a 0.8-V output voltage. With this combination

of low noise, high PSRR, and low output voltage, the device is designed to power a multitude of loads from

noise-sensitive communication components to battery-powered systems.

The LP5912-EP contains several features, as shown in the Functional Block Diagram:

• Internal output resistor divider feedback

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

• Reverse current protection

• Current limit and inrush current protection

• Thermal shutdown

• Output auto discharge for fast turnoff

• Power-good output, with a fixed 140-µs typical delay

7.2 Functional Block Diagram

Current

Limit

IN

OUT

EN

Control

EN

Output

Discharge

140-µs

DELAY

PG

GND

3 M

RAD

100

EA

VIN

+

t

VBG

45 k

7.3 Feature Description

7.3.1 Enable (EN)

The LP5912-EP enable (EN) pin is internally held low by a 3-MΩ resistor to GND. The EN pin voltage must be

higher than the VEN(ON) threshold to ensure that the device is fully enabled under all operating conditions. The

EN pin voltage must be lower than the VEN(OFF) threshold to ensure that the device is fully disabled and the

automatic output 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.

7.3.2 Output Automatic Discharge (RAD)

The LP5912-EP output employs an internal 100-Ω (typical) pulldown resistance to discharge the output when the

EN pin is low. If the LP5912-EP EN pin is low (the device is off) and the OUT pin is held high by a secondary

supply, current flows from the secondary supply through the automatic discharge pulldown resistor to ground.

LP5912-EP

SNVSC57 – SEPTEMBER 2022

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