0
ACTIVE
Rating |
Catalog |
Vin (max) (V) |
5.5 |
Vin (min) (V) |
4.5 |
Iout (max) (A) |
1 |
Output options |
Fixed Output |
Vout (max) (V) |
3.3 |
Vout (min) (V) |
3.3 |
Fixed output options (V) |
3.3 |
Noise (µVrms) |
150 |
PSRR at 100 KHz (dB) |
32 |
Iq (typ) (mA) |
0.11 |
Thermal resistance θJA (°C/W) |
23, 40.9, 59.3 |
Load capacitance (min) (µF) |
33 |
Regulated outputs (#) |
1 |
Accuracy (%) |
2.5 |
Dropout voltage (Vdo) (typ) (mV) |
310 |
Operating temperature range (°C) |
-40 to 125 |
SOT-223 (DCY)-4-45.5 mm² 6.5 x 7
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.
WELL LINK CHIPS GROUP CO.,LIMITED FLAT/RM 1802 BEVERLY HOUSE 93-107 LOCKHART ROAD WANCHAI HK
