LM3940IS33 National Semiconductor, LM3940IS33 Datasheet

LM3940IS33

Manufacturer Part Number

LM3940IS33

Description

TO263

Manufacturer

National Semiconductor

Datasheet

1.LM3940IT33.pdf (11 pages)

Specifications of LM3940IS33

Date_code

07+

Current page: 1 of 11
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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.

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.

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

Connection Diagram/Ordering Information

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

See Application Hints.

Order Part Number LM3940IT-3.3

Order Part Number LM3940IS-3.3

NSC Drawing Number TO3B

NSC Drawing Number TS3B

3-Lead TO-220 Package

3-Lead TO-263 Package

(Front View)

01208003

DS012080

01208002

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

Applications

n Laptop/Desktop Computers

n Logic Systems

Order Part Number LM3940IMP-3.3

NSC Drawing Number MP04A

Package Marked L52B

3-Lead SOT-223

(Front View)

01208001

01208010

January 2003

www.national.com

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