7 Detailed Description

7.1 Overview

The LP5910 is a linear regulator capable of supplying 300-mA output current. Designed to meet the

requirements of RF and analog circuits, the LP5910 device provides low noise, high PSRR, low quiescent

current, and low line/load transient response figures. Using new innovative design techniques the LP5910 offers

class-leading noise performance without a noise bypass capacitor and the option for remote output capacitor

placement.

7.2 Functional Block Diagram

Current

limit

EA

Bandgap

IN

OUT

EN

Control

EN

Output

discharge

GND

7.3 Feature Description

7.3.1 No-Load Stability

The LP5910 remains stable and in regulation with no external load.

7.3.2 Thermal Overload Protection

The LP5910 contains a thermal shutdown protection circuit to turn off the output current when excessive heat

pass-FET exceeds 160°C (typical). Thermal shutdown hysteresis assures that the LDO again resets (turns on)

when the temperature falls to 145°C (typical).

7.3.3 Short-Circuit Protection

The LP5910 contains internal current limit which reduces output current to a safe value if the output is

average power dissipated causes the die temperature to increase to the limit value (about 160°C). The

hysteresis of the thermal shutdown circuitry can result in a cyclic behavior on the output as the die temperature

heats and cools.

7.3.4 Output Automatic Discharge

The LP5910 output employs an internal 160-Ω (typical) pulldown resistance to discharge the output when the EN

pin is low, and the device is disabled.

7.3.5 Reverse Current Protection

The device contains a reverse current protection circuit that prevents a backward current flowing through the

LDO from the OUT pin to the IN pin.

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LP5910

SNVSA91F – SEPTEMBER 2015 – REVISED APRIL 2021

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Product Folder Links: LP5910