LM3940是TI公司的一款单通道LDO产品，LM3940是用于 5V 至 3.3V 转换的 1A 低压降稳压器，本页介绍了LM3940的产品说明、应用、特性等，并给出了与LM3940相关的TI元器件型号供参考。
LM3940 - 用于 5V 至 3.3V 转换的 1A 低压降稳压器 - 单通道LDO - 线性稳压器(LDO) - TI公司（Texas Instruments，德州仪器）
- Input Voltage Range: 4.5 V to 5.5 V
- Output Voltage Specified over Temperature
- Excellent Load Regulation
- Specified 1-A Output Current
- Requires only One External Component
- Built-in Protection against Excess Temperature
- Short-Circuit Protected
- Laptop and Desktop Computers
- Logic Systems
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.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM3940 | SOT-223 (4) | 6.50 mm x 3.50 mm |
| DDPAK/TO-263 (3) | 10.18 mm x 8.41 mm | |
| TO-220 (3) | 14.986 mm x 10.16 mm |
