LP2975IMM-3.3 National Semiconductor, LP2975IMM-3.3 Datasheet

LP2975IMM-3.3

Manufacturer Part Number

LP2975IMM-3.3

Description

Manufacturer

National Semiconductor

Datasheets

1.LP2975IMM-5.0.pdf (20 pages)

2.LP2975IMM-5.0.pdf (19 pages)

3.LP2975IMM-5.0.pdf (19 pages)

Specifications of LP2975IMM-3.3

Date_code

06+

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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 “user selectable” by sizing the external

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

tion is the maximum load current multiplied by the R

of the FET.

Overcurrent protection of the external FET is easily imple-

mented by placing a sense resistor in series with V

57 mV detection threshold of the current sense circuitry

minimizes dropout voltage and power dissipation in the re-

sistor.

The standard product versions available provide output volt-

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

1.5% (“A” grade) and 2.5% (standard grade).

Block Diagram

part.

SET

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

DS100034

. The

(ON)

10003401

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 Low operating current (180 µA typical

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 −40˚C to +125˚C junction temperature range

Applications

n High-current 5V to 3.3V regulator

n Post regulator for switching converter

n Current-limited switch

Connection Diagram

1 µA in shutdown

Surface Mount Mini SO-8 Package

See NS Package Number MUA08A

See Table 1 of this Document

For Order Numbers

Top View

10003402

www.national.com

= 5V)

March 2005

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