LM3940 - National Semiconductor

LM3940 1A Low Dropout Regulator

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 .

Features

n n n n n n Output voltage specified over temperature Excellent load regulation Guaranteed 1A output current Requires only one external component Built-in protection against excess temperature Short circuit protected Applications n Laptop/Desktop Computers n Logic Systems Typical Application DS012080-1
*Required if regulator is located more than 1" from the power supply filter capacitor or if battery power is used.
*
*See Application Hints. © 1999 National Semiconductor Corporation DS012080 www.national.com www.DataSheet4U.com Connection Diagram/Ordering Information DS012080-2 DS0120.