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DC 6V–40V to 5V 3A Dual USB Step-Down Converter Module
DC 6V–40V to 5V 3A Dual USB Step-Down Converter Module
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DC 6V–40V to 5V 3A Dual USB Step-Down Converter Module
Power two USB devices simultaneously from solar panels, vehicles, or any DC source between 6V and 40V. This compact DC-DC step-down (buck) converter module delivers a stable 5V/3A output with up to 92% conversion efficiency — keeping your phones, tablets, and other USB gadgets charged wherever you are. Made in Mainland China.
Key Features
- High Efficiency: Up to 92% power conversion efficiency minimises energy waste and heat build-up, making the most of every watt from your solar panel or vehicle battery.
- Dual USB Output: Two USB-A ports deliver a combined maximum of 5V/3A, letting you charge two devices at the same time — ideal for phones, tablets, and power banks.
- Wide Input Range (6V–40V DC): Compatible with 12V/24V vehicle systems, solar charge controllers, and a broad range of DC power sources. Input connector: 5.5×2.1 mm barrel jack plus included wire leads.
- Compact & Lightweight: At just 50 × 35 × 12 mm and a red PCB design, this module fits neatly into enclosures, DIY builds, or project boxes without taking up valuable space.
- Broad Device Compatibility: Supports any USB 5V device — smartphones, tablets, portable speakers, GPS units, and more.
- Wide Operating Temperature: Rated from –40 °C to +85 °C, performing reliably in harsh outdoor or automotive environments.
Full Specifications
| Input Voltage | 6V–40V DC (5.5×2.1 mm port) |
| Output Voltage | 5V (fixed) |
| Output Current | 3A maximum |
| Efficiency | Up to 92% |
| Switching Frequency | 150 kHz |
| Operating Temperature | –40 °C to +85 °C |
| Dimensions | 50 × 35 × 12 mm (L × W × H) |
| Color | Red PCB |
| Country of Origin | Made in Mainland China |
What's in the Box
- 1 × Dual USB Step-Down Converter Module
- 1 × Wire (pre-attached leads)
Ideal Use Cases
- Solar charging systems and solar controller projects
- 12V/24V vehicle USB charging in cars, trucks, RVs, and boats
- DIY electronics, maker projects, and embedded power supplies
- Off-grid and outdoor charging setups
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For more information on electrical safety standards for DC power conversion modules, visit the U.S. Consumer Product Safety Commission (CPSC).
Learn more: Power inverter
Frequently Asked Questions
Q: What input voltage range does this dual USB step-down converter module support?
A: The module accepts a wide DC input from 6V to 40V, making it compatible with 12V car batteries, 24V truck systems, solar panels, and other common DC power sources. The input is via a 5.5×2.1 mm barrel connector plus wire leads.
Q: Can I charge two devices at the same time with this module?
A: Yes! The module features two USB-A output ports with a combined maximum output of 5V/3A. You can charge two smartphones, tablets, or other USB 5V devices simultaneously.
Q: Is this module suitable for solar panel installations?
A: Absolutely. With a wide 6V–40V input range and up to 92% efficiency, this converter is an excellent choice for integrating USB charging into solar controller setups, off-grid systems, or portable solar chargers.
Q: What is the physical size of the module?
A: The module measures 50 × 35 × 12 mm (length × width × height), making it very compact and easy to integrate into custom enclosures, DIY project boxes, or vehicle dashboards.
