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LM317DCYRG4

Adj 1.25-37V 1.5A LDO, 80dB ripple reject, current limit+thermal prot, SOT-223

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Pieza del fabricante：

LM317DCYRG4

Paquete：

SOT-223 (6.5 x 3.5 x 1.6 mm)

Marca：
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Descripción

Productos

The LM317DCYRG4 from Texas Instruments is an adjustable 1.25V to 37V, 1.5A positive voltage regulator. It features 0.1% line regulation, 0.3% load regulation, and current limit and thermal shutdown protection in a SOT-223 package.

Especificaciones

Output Voltage 1.25V to 37V (adjustable)
Corriente de salida 1.5A
Input Voltage Range 3V to 40V
Line Regulation 0.01%/V (typ)
Load Regulation 0.1% (typ)
Reference Voltage 1.25V +/-1%
Ripple Rejection 80dB (typ)
Temperatura de funcionamiento 0 to 125 C

Características

  • Output voltage adjustable from 1.25V to 37V
  • 1.5A output current capability
  • Excellent line and load regulation
  • 80dB ripple rejection
  • Current limit constant with temperature
  • Thermal overload protection
  • Floating operation for high voltages
  • Only two external resistors needed

Aplicaciones

  • Adjustable power supplies
  • Battery chargers
  • Current regulators
  • Audio amplifier power
  • General-purpose voltage regulation

The LM317DCYRG4 from Texas Instruments is an adjustable 3-terminal positive voltage regulator capable of supplying 1.5A over an output voltage range of 1.25V to 37V. It requires only two external resistors to set the output voltage, making it exceptionally easy to use. The device features excellent line regulation of 0.01%/V and load regulation of 0.1%, with 80dB ripple rejection for clean output. The internal reference voltage of 1.25V +/-1% ensures accurate output setting. Current limiting and thermal shutdown protect the device under fault conditions. The floating design allows the regulator to be used in high-voltage applications where the regulator operates as a voltage difference device. The LM317DCYRG4 is available in a SOT-223 surface-mount package rated for 0 to 125 C operation.

The LM317DCYRG4 operates as a floating adjustable voltage regulator using a 1.25V reference. Key subsystems include: (1) Bandgap Reference – a precision 1.25V reference between the OUT and ADJ pins sets the minimum output voltage; (2) Error Amplifier – compares the voltage at the ADJ pin with the internal reference and drives the series pass transistor; (3) Series Pass Transistor – an NPN Darlington provides up to 1.5A output current; (4) Current Limiting – internal circuitry monitors output current and limits to a safe value, relatively constant over temperature; (5) Thermal Shutdown – monitors junction temperature and shuts down the pass transistor when exceeding safe limits; (6) Output Setting – the output voltage is determined by VOUT = 1.25V x (1 + R2/R1) + IADJ x R2.

Pin Nombre Tipo Función
1 ADJ Entrada Adjustment terminal (voltage set feedback)
2 VOUT Salida Regulated output voltage
3 VIN Potencia Input voltage supply (3V to 40V)
4 VOUT Salida Output (tab, connected to pin 2)
  • Adjustable bench and lab power supplies
  • Battery charger circuits with voltage and current regulation
  • Constant current source using the ADJ terminal
  • Audio amplifier regulated power supplies with 80dB ripple rejection
  • General-purpose voltage regulation for embedded systems
Fabricante Número de pieza Paquete Notas
Texas Instruments LM317MDCYRG4 SOT-223 500mA version
onsemi LM317MDT DPAK 500mA, DPAK package
STMicroelectronics LM317DT TO-252 1.5A, DPAK package
Diodos Inc AZ1117CH-ADJTRG1 SOT-223 1A, adjustable LDO
Microchip MCP1825S-ADJE/DC SOT-223 500mA, low dropout
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