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LM3940IT-3.3 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3940IT-3.3 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page 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. 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 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 01208002 3-Lead TO-220 Package (Front View) Order Part Number LM3940IT-3.3 NSC Drawing Number TO3B 01208003 3-Lead TO-263 Package (Front View) Order Part Number LM3940IS-3.3 NSC Drawing Number TS3B 01208010 3-Lead SOT-223 (Front View) Order Part Number LM3940IMP-3.3 Package Marked L52B NSC Drawing Number MP04A January 2003 © 2003 National Semiconductor Corporation DS012080 www.national.com |
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