The LM3940 is a 1-A low-dropout regulator designed to provide 3.3 V from a 5-V supply.
The LM3940 is ideally suited for systems which contain both 5-V and 3.3-V logic, with prime power provided from a 5-V bus.
Because the LM3940 is a true low dropout regulator, it can hold its 3.3-V output in regulation with input voltages as low as 4.5 V.
The TO-220 package of the LM3940 means that in most applications the full 1 A of load current can be delivered without using an additional heatsink.
The surface mount DDPAK/TO-263 package uses minimum board space, and gives excellent power dissipation capability when soldered to a copper plane on the PC board.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3940 1-A Low-Dropout Regulator for 5-V to 3.3-V Conversion datasheet (Rev. G) | PDF | HTML | 16 Feb 2015 |
| Application note | AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) | 23 Apr 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-223 (DCY) | 4 | Ultra Librarian |
| TO-220 (NDE) | 3 | Ultra Librarian |
| TO-263 (KTT) | 3 | Ultra Librarian |
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