LM3940IT33NOPB

Manufacturer Part NumberLM3940IT33NOPB
DescriptionTO-220-3
ManufacturerNational Semiconductor
LM3940IT33NOPB datasheet
 


Specifications of LM3940IT33NOPB

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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
*
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
3-Lead TO-220 Package
(Front View)
Order Part Number LM3940IT-3.3
NSC Drawing Number TO3B
3-Lead TO-263 Package
(Front View)
Order Part Number LM3940IS-3.3
NSC Drawing Number TS3B
© 2003 National Semiconductor Corporation
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
01208002
Order Part Number LM3940IMP-3.3
NSC Drawing Number MP04A
01208003
DS012080
January 2003
01208001
01208010
3-Lead SOT-223
(Front View)
Package Marked L52B
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