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LM3940ISX-3.3/NOPB

1A LDO, 5V to 3.3V, TO-263-3

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Pieza del fabricante：

LM3940ISX-3.3/NOPB

Paquete：

TO-263-3 (DDPAK, 10.16 x 15.24 mm)

Marca：
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Descripción

Productos

The LM3940ISX-3.3/NOPB from Texas Instruments is a 1A low-dropout voltage regulator designed to provide 3.3V from a 5V supply in a TO-263 (DDPAK) surface-mount package. The ISX denotes the TO-263 package on tape and reel. With only 0.5V typical dropout at 1A, it maintains regulation with inputs as low as 4.5V, making it ideal for mixed 5V/3.3V logic systems.

Especificaciones

Output Voltage 3.3V fixed
Input Voltage 4.5V to 5.5V
Corriente de salida 1A
Dropout Voltage 310mV typical @ 1A
Accuracy 2.5%
Noise 150 uVrms
PSRR 32dB @ 100kHz
Iq 110uA typical
Min Output Cap 33uF
Temperatura de funcionamiento -40 to +125 C
Paquete TO-263-3 (DDPAK)

Características

  • 1A output with 0.5V typical dropout
  • Fixed 3.3V output for 5V-to-3.3V conversion
  • Only one external component required (output capacitor)
  • Thermal shutdown and short-circuit protection
  • 2.5% output voltage accuracy over temperature

Aplicaciones

  • 5V to 3.3V logic level conversion
  • Mixed-voltage microprocessor systems
  • Battery-powered portable devices
  • Post-regulation for switching supplies

The LM3940ISX-3.3/NOPB from Texas Instruments is a 1A low-dropout voltage regulator designed to provide 3.3V from a 5V supply in a TO-263 (DDPAK) surface-mount package. The ISX denotes the TO-263 package on tape and reel. With only 0.5V typical dropout at 1A, it maintains regulation with inputs as low as 4.5V, making it ideal for mixed 5V/3.3V logic systems.

The LM3940ISX-3.3/NOPB operates as described in the product overview. Key subsystems include the input stage, processing/gain stage, output stage, and protection circuitry as detailed in the datasheet.

Pin Nombre Tipo Descripción
1 VIN Entrada Unregulated input (4.5-5.5V)
2 GND Potencia Suelo
3 VOUT Salida Regulated 3.3V output
Pestaña GND Potencia Ground/thermal pad
  • 5V to 3.3V logic level conversion
  • Mixed-voltage microprocessor systems
  • Battery-powered portable devices
  • Post-regulation for switching supplies
Modelo Fabricante Paquete Notas
LM3940IMP-3.3/NOPB TI SOT-223-4 Smaller package
LD1117S33TR ST SOT-223 Lower cost alternative
AMS1117-3.3 Advanced SOT-223 Popular clone
TLV1117LV33DCYR TI SOT-223 Lower Iq, wider Vin
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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