Current

limit

EA

Bandgap

IN

OUT

EN

Control

EN

Output

discharge

GND

11

LP5910

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SNVSA91C – SEPTEMBER 2015 – REVISED JUNE 2016

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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

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 is

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

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.