3A DC-DC Buck Converter Module 5V-30V to 3.3V/5V/12V Step Down

3A DC-DC Step Down Buck Converter Module — Reliable Voltage Regulation for DIY & Pro Projects

Need a compact, efficient power solution for your electronics project? The ALLOYSEED 3A DC-DC Buck Converter Module steps down input voltages from 5V–30V to selectable outputs of 3.3V, 5V, or 12V with up to 96% conversion efficiency. Whether you're powering a surveillance camera, a custom DIY build, or a mobile charging device, this little board delivers stable, reliable power in a tiny 17.5 × 12 mm footprint.

Made in Mainland China.

Key Features

• Wide Input Range: Accepts DC 5V–30V input (input must exceed the selected output voltage).
• Flexible Output: Selectable fixed output voltages — 3.3V, 5V, or 12V — to suit a variety of applications.
• High Efficiency: Up to 96% conversion efficiency minimizes heat and energy waste.
• Stable Output: Output accuracy of ±0.1V and ripple <30mV keep sensitive electronics safe.
• Ultra-Compact Design: At just 17.5 × 12 mm, it integrates easily into tight enclosures and PCB assemblies.
• Broad Temperature Range: Operates reliably from −40°C to +85°C — suitable for harsh environments.
• Low No-Load Draw: Less than 1mA idle current conserves battery in portable applications.

Specifications

Common Applications

• DIY mobile power supplies & portable battery packs
• Surveillance & security camera power regulation
• Children's ride-on car & stroller power systems
• Automotive & vehicle electronics power conversion
• Communication & radio equipment power supply
• Arduino, Raspberry Pi & other microcontroller projects
• Custom PCB and embedded system power rails

What's in the Box

• 1 × ALLOYSEED 3A DC-DC Buck Converter Module

Important Notes

Input voltage must always be higher than the selected output voltage. Due to different monitor settings and lighting conditions, the actual appearance of the item may vary slightly from product images. Please allow a 1–2 mm difference in measurements due to manual measurement.

For electrical safety best practices and guidance on electronic components, refer to the U.S. Consumer Product Safety Commission — Electrical Safety.

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Frequently Asked Questions

Q: What input voltage range does this DC-DC buck converter module support?

A: The module accepts a DC input voltage between 5V and 30V. The key requirement is that your input voltage must always be higher than your chosen output voltage (3.3V, 5V, or 12V) for proper step-down operation.

Q: Can I use this buck converter module with an Arduino or Raspberry Pi?

A: Absolutely. This module is a popular choice for powering Arduino, Raspberry Pi, and other microcontroller boards. Select the 5V output for most standard boards and enjoy stable, regulated power with up to 3A current delivery.

Q: How do I select the output voltage (3.3V, 5V, or 12V)?

A: The output voltage is set via a configuration jumper or solder pad on the board (depending on the version). Refer to the module markings or included documentation to select your desired output before connecting to your circuit.

Q: Is this buck converter module safe for use in automotive or outdoor applications?

A: Yes. With an operating temperature range of −40°C to +85°C and a stable output with low ripple (<30mV), this module is well-suited for automotive, outdoor surveillance, and other demanding environments. Always ensure proper wiring and fusing for vehicle installations.