Packaging:
| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow |
|---|---|---|---|---|---|
| LM3940IMP-3.3/NOPB LM3940IMP-3.3 |
SOT-223 | 4 | 1 1 |
260 260 |
|
| LM3940IMPX-3.3/NOPB LM3940IMPX-3.3 |
SOT-223 | 4 | 1 1 |
260 260 |
|
| LM3940IS-3.3/NOPB LM3940IS-3.3 |
TO-263 | 3 | 3 3 |
245 235 |
|
| LM3940ISX-3.3/NOPB LM3940ISX-3.3 |
TO-263 | 3 | 3 3 |
245 235 |
|
| LM3940IT-3.3/NOPB LM3940IT-3.3 |
TO-220 | 3 | 1 1 |
NA NA |
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.
Applications
| • | Laptop/Desktop Computers |
| • | Logic Systems |
| • | 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 |
Diagrams:
Typical Application
Connection Diagram
Typical Performance
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