LM3940

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用于 5V 至 3.3V 电压转换的 1A 低压降稳压器

产品详情

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 Rating Catalog Noise (µVrms) 150 PSRR at 100 KHz (dB) 32 Iq (typ) (mA) 0.11 Thermal resistance θJA (°C/W) 23 Load capacitance (min) (µF) 33 Regulated outputs (#) 1 Accuracy (%) 2.5 Dropout voltage (Vdo) (typ) (mV) 310 Operating temperature range (°C) -40 to 125
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 Rating Catalog Noise (µVrms) 150 PSRR at 100 KHz (dB) 32 Iq (typ) (mA) 0.11 Thermal resistance θJA (°C/W) 23 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 TO-220 (NDE) 3 46.5328 mm² 10.16 x 4.58 TO-263 (KTT) 3 154.8384 mm² 10.16 x 15.24
  • 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
  • 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

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.

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.

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类型 标题 下载最新的英语版本 日期
* 数据表 LM3940 1-A Low-Dropout Regulator for 5-V to 3.3-V Conversion 数据表 (Rev. G) PDF | HTML 2015年 2月 16日
应用手册 AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) 2013年 4月 23日

设计和开发

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封装 引脚 CAD 符号、封装和 3D 模型
SOT-223 (DCY) 4 Ultra Librarian
TO-220 (NDE) 3 Ultra Librarian
TO-263 (KTT) 3 Ultra Librarian

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包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

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