Datasheet > LP2975

LP2975

更新时间： 2024-02-18 18:57:02

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器控制器
页数	文件大小	规格书
19页	718K
描述
MOSFET LDO Driver/Controller

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LP2975 数据手册

September 1997

LP2975

MOSFET LDO Driver/Controller

General Description

Features

n Simple to use, few external components

n Ultra-small mini SO-8 package

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.

n 1.5% (A grade) precision output voltage

n Low-power shutdown input

High open loop gain assures excellent regulation and ripple

rejection performance.

1 µA in shutdown

n Low operating current (180 µA typical V_IN= 5V)

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

n Built-in current limit amplifier

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_DS(ON)

of the FET.

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

Overcurrent protection of the external FET is easily imple-

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

57 mV detection threshold of the current sense circuitry mini-

mizes dropout voltage and power dissipation in the resistor.

Applications

n High-current 5V to 3.3V regulator

n Post regulator for switching converter

n Current-limited switch

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

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

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

SET

part.

DS100034

www.national.com

12 3 4 5 6 7...19

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