Description
LM317 Adjustable DC Step-Down Voltage Regulator Module 1.2V–37V
The LM317 DC-DC Step-Down Power Converter Module is an adjustable linear voltage regulator module designed to convert a higher DC input voltage into a lower, regulated DC output voltage. The output voltage can be adjusted from approximately 1.2V to 37V, making the module useful for powering different electronic circuits that require a specific voltage level. Its compact design makes it convenient for DIY electronics, prototyping, and power-supply applications. The module supports an input voltage range of approximately 4.2V to 40V DC and provides an output current capability of up to 1.5A, depending on input/output voltage difference, load, and thermal conditions. With clearly defined VIN, GND, VOUT, and GND terminals, the module is easy to integrate into electronic circuits and custom power-supply projects.
Important: The LM317 is a linear regulator, not a switching buck converter. It dissipates the voltage difference between input and output as heat, so adequate heat dissipation is required at higher load currents or larger voltage drops.
Key Features
- Adjustable Output Voltage: Approximately 1.2V to 37V DC.
- Wide Input Range: Approximately 4.2V to 40V DC.
- 1.5A Output Capability: Suitable for compatible low- to medium-power circuits.
- LM317 Regulator: Reliable adjustable linear voltage regulation.
- Compact Module: Approx. 35.6 × 16.8mm.
- Simple Connections: Clearly marked VIN, GND, VOUT, and GND.
- DIY Friendly: Suitable for electronics prototyping and custom power supplies.
- Adjustable Regulation: Output can be set according to circuit requirements.
- Versatile Applications: Useful for embedded systems, sensors, development boards, and electronic circuits.
Technical Specifications
| Parameter | Specification |
|---|---|
| Module Type | Adjustable Linear Voltage Regulator |
| Regulator IC | LM317 |
| Input Voltage | 4.2V–40V DC |
| Adjustable Output Voltage | 1.2V–37V DC |
| Output Current | Up to 1.5A |
| Minimum Output Current Rating | 1.5A |
| Typical Current Capability | Up to 2.2A |
| Maximum Input-Output Differential | 40V DC |
| Operating Temperature | 0°C–125°C |
| IC Temperature Range | -55°C to 150°C |
| Characteristic Frequency | 100MHz |
| Module Length | 35.6mm |
| Module Width | 16.8mm |
| Input Connection | VIN (+), GND (−) |
| Output Connection | VOUT (+), GND (−) |
| Regulator Type | Linear |
Applications
- Adjustable DC power supplies
- DIY electronics projects
- Electronic circuit prototyping
- Sensor power supplies
- Microcontroller projects
- Development board power supply
- Embedded systems
- LED circuits
- Battery-powered projects
- Audio electronics
- Instrumentation circuits
- Robotics projects
- Educational electronics
- Voltage regulation experiments
- Custom power supply circuits
Precautions
- Do not exceed the specified 40V DC maximum input voltage.
- Ensure the input voltage is higher than the required output voltage.
- Verify VIN, VOUT, and GND polarity before powering the module.
- Do not short-circuit the output.
- The LM317 is a linear regulator and can become hot during operation.
- Use adequate heat dissipation when operating at higher currents or with a large input/output voltage difference.
- Do not exceed the recommended output current.
- Avoid operating the module continuously at maximum current without suitable thermal management.
- Do not connect AC mains voltage directly to the module.
- Use a stable DC input supply.
- Disconnect power before modifying circuit connections.
- Check the output voltage with a multimeter before connecting sensitive electronics.
- Keep the module away from water, conductive surfaces, and excessive heat.