LM3940

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用于 5V 至 3.3V 电压转换的 1A 低压降稳压器

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数据表

document-pdfAcrobat LM3940 1-A Low-Dropout Regulator for 5-V to 3.3-V Conversion 数据表 (Rev. G) (英语) PDF | HTML

LM3940

正在供货

数据表

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产品详情

Output options

Fixed Output

Iout (max) (A)

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)

Rating

Catalog

Load capacitance (min) (µF)

Regulated outputs (#)

Accuracy (%)

2.5

PSRR at 100 KHz (dB)

Dropout voltage (Vdo) (typ) (mV)

310

Operating temperature range (°C)

-40 to 125

Output options

Fixed Output

Iout (max) (A)

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)

Rating

Catalog

Load capacitance (min) (µF)

Regulated outputs (#)

Accuracy (%)

2.5

PSRR at 100 KHz (dB)

Dropout voltage (Vdo) (typ) (mV)

310

Operating temperature range (°C)

-40 to 125

SOT-223 (DCY)

45.5 mm² 6.5 x 7

TO-220 (NDE)

46.5328 mm² 10.16 x 4.58

TO-263 (KTT)

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