LM317 Adjustable Linear Regulator 4.5-40V

The LM317 DC-DC Step Down Adjustable Linear Regulator is a compact power module built around the industry-standard LM317 IC, letting you convert a higher DC input voltage into a precise, user-adjustable output. Perfect for hobbyists, students, and engineers, this module accepts a wide input range and steps it down to any output between 1.25V and 37V using an onboard potentiometer, eliminating the need to hand-wire a regulator circuit from scratch. It’s a go-to choice for building bench power supplies, powering microcontrollers and sensors at custom voltages, charging batteries, driving LEDs, and general voltage regulation tasks in DIY electronics and embedded projects.

Built on TI’s LM317 three-terminal positive voltage regulator, the module offers excellent line and load regulation along with built-in current limiting, thermal overload protection, and safe operating area protection, making it a robust and forgiving choice for prototyping. Since it’s a linear regulator, output ripple is very low compared to switching converters, which is valuable for powering noise-sensitive analog and RF circuits. Keep in mind that as a linear design it dissipates excess power as heat, so a heatsink is recommended when running higher current loads or large input-to-output voltage differentials. Simple screw terminals or pin headers make wiring straightforward, and the two mounting holes allow for permanent installation in enclosures.

Specification:

• IC : LM317
• Input Voltage : 4.5V to 40V DC
• Output Voltage : 1.25V to 37V DC (adjustable)
• Output Current : Up to 1.5A (2.2A peak)
• Line Regulation : 0.01% (typical)
• Load Regulation : 0.1% (typical)
• Protection Features : Current limiting, thermal overload, safe operating area protection
• Operating Temperature : 0°C to 125°C
• Voltage Adjustment : Onboard potentiometer