Bandgap

IN

OUT2

EN

Control

EN1

EN2

GND

OUT1

EN

Control

3MŸ

3MŸ

9

LP8900

www.ti.com

SNVS542E – MAY 2008 – REVISED JUNE 2016

Product Folder Links: LP8900

Submit Documentation Feedback

Copyright © 2008–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The LP8900 is a dual linear regulator capable of supplying 200 mA output current per regulator. Designed to

meet the requirements of RF and analog circuits, the LP8900 provides low device noise, high PSRR, low

quiescent current, and superior line transient response figures.

Using new innovative design techniques the LP8900 offers class-leading device noise performance without a

noise bypass capacitor. The LP8900 is designed to perform with a single 1-µF input capacitor and a single 1-µF

ceramic output capacitor.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Enable Control

The LP8900 may be switched ON or OFF by a logic input at the EN pin. A high voltage at this pin turns the

device on. When the enable pin is low, the regulator output is off and the device typically consumes 3 nA.

However if the application does not require the shutdown feature, the EN pin can be tied to VIN to keep the

regulator permanently on. To ensure fast start-up is achieved, EN must be driven separately.

A 3-M

Ω pulldown resister ties the EN input to ground, this ensures that the device remains off when the enable

pin is left open circuit. To ensure proper operation, the signal source used to drive the EN input must be able to

swing above and below the specified turnon or turnoff voltage thresholds listed in Electrical Characteristics under

VIL and VIH.