IN

1.2 V

+

EN

GND

POR

+

OUT

+

EN

EN

1 M

10

LP5900

SNVS358R – JULY 2005 – REVISED JUNE 2016

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Copyright © 2005–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

Designed to meet the needs of sensitive RF and analog circuits, the LP5900 provides low noise, high PSRR, and

low quiescent current, as well as low line and load transient response figures. Using new innovative design

techniques, the LP5900 offers class-leading noise performance without the need for a separate noise filter

capacitor.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 No-Load Stability

The LP5900 remains stable and in regulation with no external load.

7.3.2 Enable Control

The LP5900 enable (EN) pin is internally held low by a 1-M

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

7.3.3 Low Noise Output

Any internal noise at the LP5900 reference voltage is reduced by a first order low-pass RC filter before it is

passed to the output buffer stage. This eliminates the need for the external bypass capacitor for noise

suppression.