LM317T Adjustable Positive Voltage Regulator Ic

LM317 / LM317T Adjustable Voltage Regulator – Variable Linear Power Supply IC
The LM317 is a highly popular adjustable 3-terminal positive voltage regulator capable of delivering up to 1.5A output current with an adjustable output voltage range from 1.25V to 37V. Widely used in power regulation circuits, battery chargers, current limiting applications, and variable power supplies, the LM317 is valued for its flexibility, simplicity, and reliable performance in both hobbyist and industrial electronics projects.

Why it’s a System Essential:
• Adjustable Output Voltage: Output voltage can be configured from 1.25V to 37V using simple external resistors.
• High Output Current Capability: Supports up to 1.5A output current for medium-power applications.
• Multi-Purpose Regulator: Can function as a voltage regulator, current limiter, battery charger, or adjustable current source.
• Simple Circuit Design: Requires only a few external components for operation.
• Widely Used Industry Standard: Commonly found in power supplies, chargers, and consumer electronics.
• Breadboard-Friendly Package: TO-220 package is ideal for prototyping and educational use.
• Flexible Embedded Power Solution: Suitable for variable and fixed voltage applications.

Technical Specifications:
• Device Type: Adjustable Positive Voltage Regulator
• Part Number: LM317 / LM317T
• Output Voltage Range: 1.25V to 37V
• Maximum Output Current: 1.5A

Electrical Characteristics:
• Maximum Input-to-Output Voltage Difference: 40V
• Recommended Voltage Difference: 15V
• Maximum Output Current at 15V Difference: 2.2A
• Typical Voltage Drop During Regulation: Approximately 2.5V

Thermal Specifications:
• Maximum Operating Junction Temperature: 125°C

Pin Configuration:
• Adjust Pin
• Input Voltage Pin
• Output Voltage Pin

Package Options:
• TO-220
• SOT-223
• TO-263

Features:
• Adjustable 3-terminal positive voltage regulator
• Variable voltage output support
• Current limiting capability
• Simple external component requirement
• Suitable for power regulation and charging circuits
• Reliable linear regulation performance

Applications:
• Variable voltage power supplies
• Battery charger circuits
• Current limiting applications
• Adjustable current regulators
• Positive voltage regulation systems
• Reverse polarity protection circuits
• Motor control circuits
• Desktop PC and consumer electronics power modules
• DIY electronics projects

Best For:
Ideal for students, hobbyists, makers, engineers, and power electronics developers working on adjustable power supplies, battery chargers, motor control systems, current limiting circuits, embedded electronics, and general-purpose voltage regulation applications requiring flexible and reliable linear power regulation.