LM317 Variable Voltage Regulator IC

LM317 Variable Voltage Regulator IC 

The LM317 is a popular adjustable linear voltage regulator capable of providing a stable output voltage from 1.25V up to 37V with an output current of up to 1.5A (with proper heatsinking). It is widely used in power supply circuits, battery chargers, LED drivers, and general-purpose voltage regulation applications.

The output voltage is easily set using just two external resistors, making the LM317 extremely flexible and easy to use. The IC includes built-in current limiting, thermal shutdown, and safe operating area protection, ensuring reliable and safe operation in a wide variety of designs.

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Applications

• Adjustable DC power supplies
• Battery chargers
• LED current regulators
• Microcontroller and logic circuit power supplies
• Post-regulation for switching power supplies
• Laboratory power supplies
• Industrial and hobby electronics projects

Features

• Output Voltage Range: 1.25V to 37V adjustable
• Output Current: Up to 1.5A (with proper heatsinking)
• Requires only two resistors to set output voltage
• Built-in thermal shutdown, current limiting, and safe operating area protection
• Good line and load regulation
• Short-circuit protected
• Simple and reliable operation
• Widely available in TO-220, TO-3, and SMD packages

LM317-IC Datasheet