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.
| Output options | Fixed Output |
| Iout (max) (A) | 1 |
| Vin (max) (V) | 5.5 |
| Vin (min) (V) | 4.5 |
| Vout (max) (V) | 3.3 |
| Vout (min) (V) | 3.3 |
| Fixed output options (V) | 3.3 |
| Noise (µVrms) | 150 |
| Iq (typ) (mA) | 0.11 |
| Thermal resistance θJA (°C/W) | 23 |
| Rating | Catalog |
| Load capacitance (min) (µF) | 33 |
| Regulated outputs (#) | 1 |
| Accuracy (%) | 2.5 |
| PSRR at 100 KHz (dB) | 32 |
| Dropout voltage (Vdo) (typ) (mV) | 310 |
| Operating temperature range (°C) | -40 to 125 |
| SOT-223 (DCY) | 4 | 45.5 mm² 6.5 x 7 |
| TO-220 (NDE) | 3 | 46.5328 mm² 10.16 x 4.58 |
| TO-263 (KTT) | 3 | 154.8384 mm² 10.16 x 15.24 |
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