DC-DC Step-Down Converter with Dual USB – Stable 5V Power from 10V to 55V Sources
Do you need to power USB devices from a 12V, 24V, or even 48V power source without the risk of damaging your electronics? This DC-DC step-down converter is engineered for exactly that purpose. It transforms highly variable input voltages into a clean, constant 5V output, available through two simultaneous USB ports.
Note: This module is supplied as an open-board unit (no housing). The output voltage is fixed at 5V and is not adjustable. The maximum recommended power output is 15W (5V × 3A).
Why choose this model? (Key Advantages):
- Wide 10V–55V Input Range — Compatible with 12V car batteries, 24V truck systems, and 36V or 48V solar panels without needing extra adapters.
- Stable 5V Output — Vehicle power can fluctuate significantly; this module maintains a steady output to protect your phone, dash cam, or tablet from voltage spikes.
- Dual Active USB Ports — Charge your phone and power your dash cam simultaneously without power loss.
- Switching (Buck) Topology — Significantly more efficient than traditional linear regulators, generating less heat and ensuring long-term reliability even in hot vehicle interiors.
- Integrated Protection — Built-in overcurrent and overheating protection automatically shuts down the module to prevent damage.
- Direct Installation — Pre-tinned wires connect directly to battery terminals or solar controllers for a quick, secure setup.
Performance and Technical Details
This converter utilizes high-efficiency switching step-down (buck) topology, which converts energy with much lower heat dissipation than linear regulators. The 5V DC output remains stable across the entire 10V–55V input range, even under varying loads. The 3A total current is dynamically distributed between the two USB ports based on the requirements of your connected devices.
With integrated overcurrent and thermal protection, this module is ideal for permanent installations, such as within solar power control panels, under a truck dashboard, or inside an e-bike battery housing. The direct-wire connection eliminates the need for intermediate connectors, reducing resistance and potential power loss.
| Parameter | Specification |
|---|---|
| Input Voltage | 10V – 55V DC |
| Typical Compatible Voltages | 12V, 24V, 36V, 48V |
| Output Voltage | 5V DC (Fixed, non-adjustable) |
| Max Output Current | 3A Total (combined across both USB ports) |
| Max Power | 15W |
| USB Ports | 2 × USB-A |
| Converter Type | Step-down switching (buck) |
| Integrated Protections | Overcurrent, Overheating |
| Input Connection | Pre-tinned wires (Positive / Negative) |
| Recommended Applications | 12V/24V Auto, 24V Truck, Solar Systems, E-bikes, Electric Scooters |
Package Contents
- 1 × 10–55V to 5V 3A DC-DC Step-Down Module with 2 USB Ports
Frequently Asked Questions
Can I connect this module directly to a 12V car battery?
Yes. A 12V car battery falls perfectly within the 10V–55V input range. Simply connect the red wire to the positive terminal and the black wire to the negative terminal or a fused circuit.
Is this compatible with 24V or 48V solar systems?
Yes. The module accepts any input voltage between 10V and 55V, making it fully compatible with 24V, 36V, and 48V systems. The output remains a stable 5V regardless of solar panel fluctuations.
Can I charge two phones at the same time?
Yes. The 3A total current is shared between the two ports. If both devices are drawing maximum power, each will receive approximately 1.5A, which is sufficient for standard charging on most smartphones.
Does it require an external heatsink?
Not under normal operating conditions. When running at a continuous 3A load, ensure there is minimal airflow around the module. An external heatsink is not required unless the unit is enclosed in a completely airtight space with no air circulation.
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