- 制造厂商:TI
- 产品类别:电源管理
- 技术类目:线性和低压降 (LDO) 稳压器
- 功能描述:用于 5V 至 3.3V 电压转换的 1A 低压降稳压器
- 点击这里打开及下载LM3940的技术文档资料
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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.
- 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
- 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 (uVrms)
- 150
- Iq (Typ) (mA)
- 0.11
- Thermal resistance θJA (°C/W)
- 23
- Rating
- Catalog
- Load capacitance (Min) (μF)
- 33
- Regulated outputs (#)
- 1
- Features
- —
- Accuracy (%)
- 2.5
- PSRR @ 100 KHz (dB)
- 32
- Dropout voltage (Vdo) (Typ) (mV)
- 310
- Operating temperature range (C)
- -40 to 125
LM3940的完整型号有:LM3940IMP-3.3/NOPB、LM3940IMPX-3.3/NOPB、LM3940IS-3.3/NOPB、LM3940ISX-3.3/NOPB、LM3940IT-3.3/NOPB、LM3940IMP-3.3、LM3940IMPX-3.3、LM3940IS-3.3、LM3940ISX-3.3、LM3940IT-3.3,以下是这些产品的关键参数及官网采购报价:
LM3940IMP-3.3/NOPB,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:1000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3940IMP-3.3/NOPB的批量USD价格:0.702(1000+)
LM3940IMPX-3.3/NOPB,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3940IMPX-3.3/NOPB的批量USD价格:0.585(1000+)
LM3940IS-3.3/NOPB,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-3-245C-168 HR,引脚镀层/焊球材料:SN,TI官网LM3940IS-3.3/NOPB的批量USD价格:0.883(1000+)
LM3940ISX-3.3/NOPB,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:500个,MSL 等级/回流焊峰值温度:Level-3-245C-168 HR,引脚镀层/焊球材料:SN,TI官网LM3940ISX-3.3/NOPB的批量USD价格:0.766(1000+)
LM3940IT-3.3/NOPB,工作温度:-40 to 125,封装:TO-220 (NDE)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-1-NA-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3940IT-3.3/NOPB的批量USD价格:0.638(1000+)
LM3940IMP-3.3,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:1000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SNPB,TI官网LM3940IMP-3.3的批量USD价格:0.907(1000+)
LM3940IMPX-3.3,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SNPB,TI官网LM3940IMPX-3.3的批量USD价格:0.79(1000+)
LM3940IS-3.3,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-3-235C-168 HR,引脚镀层/焊球材料:SNPB,TI官网LM3940IS-3.3的批量USD价格:1.088(1000+)
LM3940ISX-3.3,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:500个,MSL 等级/回流焊峰值温度:Level-3-235C-168 HR,引脚镀层/焊球材料:SNPB,TI官网LM3940ISX-3.3的批量USD价格:0.971(1000+)
LM3940IT-3.3,工作温度:-40 to 125,封装:TO-220 (NDE)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-1-NA-UNLIM,引脚镀层/焊球材料:SNPB,TI官网LM3940IT-3.3的批量USD价格:0.842(1000+)
LM3940IMP-3.3/NOPB,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:1000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3940IMP-3.3/NOPB的批量USD价格:0.702(1000+)
LM3940IMPX-3.3/NOPB,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3940IMPX-3.3/NOPB的批量USD价格:0.585(1000+)
LM3940IS-3.3/NOPB,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-3-245C-168 HR,引脚镀层/焊球材料:SN,TI官网LM3940IS-3.3/NOPB的批量USD价格:0.883(1000+)
LM3940ISX-3.3/NOPB,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:500个,MSL 等级/回流焊峰值温度:Level-3-245C-168 HR,引脚镀层/焊球材料:SN,TI官网LM3940ISX-3.3/NOPB的批量USD价格:0.766(1000+)
LM3940IT-3.3/NOPB,工作温度:-40 to 125,封装:TO-220 (NDE)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-1-NA-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3940IT-3.3/NOPB的批量USD价格:0.638(1000+)
LM3940IMP-3.3,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:1000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SNPB,TI官网LM3940IMP-3.3的批量USD价格:0.907(1000+)
LM3940IMPX-3.3,工作温度:-40 to 125,封装:SOT-223 (DCY)-4,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SNPB,TI官网LM3940IMPX-3.3的批量USD价格:0.79(1000+)
LM3940IS-3.3,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-3-235C-168 HR,引脚镀层/焊球材料:SNPB,TI官网LM3940IS-3.3的批量USD价格:1.088(1000+)
LM3940ISX-3.3,工作温度:-40 to 125,封装:DDPAK/TO-263 (KTT)-3,包装数量MPQ:500个,MSL 等级/回流焊峰值温度:Level-3-235C-168 HR,引脚镀层/焊球材料:SNPB,TI官网LM3940ISX-3.3的批量USD价格:0.971(1000+)
LM3940IT-3.3,工作温度:-40 to 125,封装:TO-220 (NDE)-3,包装数量MPQ:45个,MSL 等级/回流焊峰值温度:Level-1-NA-UNLIM,引脚镀层/焊球材料:SNPB,TI官网LM3940IT-3.3的批量USD价格:0.842(1000+)