LM317 Adjustable Voltage Regulator – Reliable DC-DC Buck Step-Down Power Supply

Whether you're powering an MP3 player, charging a phone, or prototyping an electronics project, this LM317 Buck Step-Down DC-DC Converter gives you precise, adjustable output voltage in a compact, rugged blue module. Set your desired output anywhere from 1.2V to 37V using the onboard potentiometer — no extra programming or complex setup required.

Key Features

Wide Input Range: Accepts 4.5V–40V DC input, compatible with a broad range of power sources and batteries.
Adjustable Output: Dial in any output voltage from 1.2V to 37V using the built-in potentiometer — perfect for custom electronics builds.
Solid Current Output: Delivers up to 1.5A continuous (2.2A typical), suitable for charging phones, MP3/MP4 players, and other low-power devices.
Built-In Protection: Safeguards against overvoltage, overcurrent, and short-circuit conditions for dependable, worry-free operation.
Compact & Lightweight: Measures just 53 × 22 × 15 mm and weighs only 17g — fits easily into tight project enclosures.
Simple Wiring: Clear VIN/GND (input) and VOUT/GND (output) terminals make wiring fast and straightforward.
Wide Operating Temperature: Rated from –55°C to +150°C for versatile use across environments.

Specifications

Input Voltage	4.5V – 40V DC
Output Voltage	1.2V – 37V (adjustable)
Output Current	1.5A (min.) / 2.2A (typical)
Max Input-Output Voltage Difference	40V DC
Operating Temperature	–55°C to +150°C
Characteristic Frequency	100 MHz
Color	Blue
Dimensions	53 × 22 × 15 mm (2.09 × 0.87 × 0.59 in)
Weight	17g
Country of Origin	Made in China

What's in the Box

1 × LM317 Adjustable Voltage Regulator Power Supply Module

Applications

Ideal for electronics hobbyists, engineers, and makers. Use it to power cell phones, MP3 players, MP4 players, LED strips, Arduino projects, robotics, and any other device requiring a stable, regulated DC voltage source.

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For more information on electrical component safety standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Note: Due to differences in monitor calibration and lighting, actual product color may vary slightly from images. Please allow ±1–2cm measurement deviation.

Learn more: Voltage regulator

Frequently Asked Questions

Q: What is the maximum output current of this LM317 voltage regulator module?

A: This LM317 DC-DC buck step-down converter delivers a minimum output current of 1.5A and a typical output of 2.2A, making it suitable for powering MP3 players, MP4 devices, cell phone chargers, and small electronics projects.

Q: Can I use this voltage regulator for Arduino or DIY electronics projects?

A: Absolutely. With its wide adjustable output range of 1.2V to 37V and a broad input range of 4.5V–40V, this module is a popular choice for Arduino builds, robotics, LED drivers, and custom power supply circuits. Simply adjust the onboard potentiometer to set your desired output voltage.

Q: Is this module protected against short circuits and overvoltage?

A: Yes. The module features built-in protection against overvoltage, overcurrent, and short-circuit conditions, ensuring safe and reliable operation during use.

Q: What are the physical dimensions of this voltage regulator board?

A: The board measures 53 × 22 × 15 mm (approximately 2.09 × 0.87 × 0.59 inches) and weighs just 17g, making it compact and easy to integrate into most project enclosures.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

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