LP2975 Datasheet, PDF(1/19 Page) National Semiconductor (TI)

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LP2975 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – MOSFET LDO Driver/Controller

September 1997

LP2975

MOSFET LDO Driver/Controller

General Description

A high-current LDO regulator is simple to design with the

LP2975 LDO Controller. Using an external P-FET, the

LP2975 will deliver an ultra low dropout regulator with ex-

tremely low quiescent current.

High open loop gain assures excellent regulation and ripple

rejection performance.

The trimmed internal bandgap reference provides precise

output voltage over the entire operating temperature range.

Dropout voltage is âuser selectableâ by sizing the external

FET: the minimum input-output voltage required for opera-

tion is the maximum load current multiplied by the RDS(ON)

of the FET.

Overcurrent protection of the external FET is easily imple-

mented by placing a sense resistor in series with VIN. The

57 mV detection threshold of the current sense circuitry mini-

mizes dropout voltage and power dissipation in the resistor.

The standard product versions available provide output volt-

ages of 12V, 5V, or 3.3V with guaranteed 25ËC accuracy of

1.5% (âAâ grade) and 2.5% (standard grade).

Features

n Simple to use, few external components

n Ultra-small mini SO-8 package

n 1.5% (A grade) precision output voltage

n Low-power shutdown input

n < 1 ÂµA in shutdown

n Low operating current (180 ÂµA typical @ VIN = 5V)

n Wide supply voltage range (1.8V to 24V)

n Built-in current limit amplifier

n Overtemperature protection

n 12V, 5V, and 3.3V standard output voltages

n Can be programmed using external divider

n â40ËC to +125ËC junction temperature range

Applications

n High-current 5V to 3.3V regulator

n Post regulator for switching converter

n Current-limited switch

Block Diagram

Connection Diagram

Surface Mount Mini SO-8 Package

DS100034-2

Top View

For Order Numbers

See Table 1 of this Document

See NS Package Number MUA08A

DS100034-1

*RSET values are: 208k for 12V part, 72.8k for 5V part, and 39.9k for 3.3V

part.

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