Datasheet > LM3940_03

LM3940_03

更新时间： 2024-09-26 04:44:19

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
11页	368K
描述
1A Low Dropout Regulator for 5V to 3.3V Conversion

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LM3940_03 数据手册

January 2003

LM3940

1A Low Dropout Regulator for 5V to 3.3V Conversion

General Description

The LM3940 is a 1A low dropout regulator designed to

provide 3.3V from a 5V supply.

Features

n Output voltage specified over temperature

n Excellent load regulation

n Guaranteed 1A output current

n Requires only one external component

n Built-in protection against excess temperature

n Short circuit protected

The LM3940 is ideally suited for systems which contain both

5V and 3.3V logic, with prime power provided from a 5V bus.

Because the LM3940 is a true low dropout regulator, it can

hold its 3.3V output in regulation with input voltages as low

as 4.5V.

The T0-220 package of the LM3940 means that in most

applications the full 1A of load current can be delivered

without using an additional heatsink.

Applications

n Laptop/Desktop Computers

n Logic Systems

The surface mount TO-263 package uses minimum board

space, and gives excellent power dissipation capability when

soldered to a copper plane on the PC board.

Typical Application

01208001

Required if regulator is located more than 1" from the power supply filter capacitor or if battery power is used.

See Application Hints.

Connection Diagram/Ordering Information

01208010

01208002

3-Lead TO-220 Package

(Front View)

3-Lead SOT-223

(Front View)

Order Part Number LM3940IMP-3.3

Package Marked L52B

Order Part Number LM3940IT-3.3

NSC Drawing Number TO3B

NSC Drawing Number MP04A

01208003

3-Lead TO-263 Package

(Front View)

Order Part Number LM3940IS-3.3

NSC Drawing Number TS3B

DS012080

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