USB to 4-Pin PWM Fan Adapter Cable | 5V to 12V Boost Converter
USB to 4-Pin PWM Fan Adapter Cable | 5V to 12V Boost Converter
Power Your PC Fan from Any USB Port
This compact USB to 4-Pin PWM Fan Power Adapter Cable lets you connect a standard 12V computer chassis fan or CPU fan directly to a USB 5V power source. Built-in boost circuitry steps up the voltage from 5V to 12V, so your fan runs at full power — no motherboard connection required. An onboard adjustable switch lets you fine-tune fan speed for the perfect balance of airflow and noise.
Ideal for DIY cooling pad builds, bench testing fans, or powering a chassis fan from a laptop or USB charger, this versatile adapter is a must-have for PC builders and electronics hobbyists alike.
Key Features
- 5V USB Input → 12V 4-Pin PWM Output — Built-in boost converter steps up voltage for full fan operation
- Adjustable Speed Switch — Dial in the fan speed to your preference without additional hardware
- Standard 4-Pin PWM Connector — Compatible with most PC chassis fans and CPU fans
- All-Copper Core Wire — Ensures efficient power transmission and minimal resistance
- PVC Insulation — Durable, flexible outer sheathing (OD 3.5mm)
- Max Power Output: 11W — Sufficient for standard 120mm and 140mm PC fans
- Compact Length: ~35cm — Tidy cable management for desktop or portable setups
Specifications
| Input Voltage | 5V (USB Type-A) |
| Output Voltage | 12V |
| Maximum Power | 11W |
| Cable Length | ~35cm |
| Wire OD | 3.5mm |
| Insulation | PVC |
| Input Connector | USB Type-A (5V) |
| Output Connector | 4-Pin PWM Fan Connector |
Common Use Cases
- Power a chassis or CPU fan via a USB port on a laptop or desktop
- DIY laptop cooling pad conversion — swap in a 12V fan using your laptop's USB port
- Bench testing PC fans without a full PSU
- Custom PC or home server cooling projects
Made in Mainland China.
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Frequently Asked Questions
Q: Will this USB to 4-Pin fan power adapter cable work with any USB port?
A: Yes — the cable is designed to work with any standard USB Type-A 5V port, including those on desktops, laptops, USB hubs, and USB wall chargers. Just ensure your USB source can supply enough current for the fan you are powering (the cable supports up to 11W maximum output).
Q: Can I use this cable to power a 3-pin fan instead of a 4-pin PWM fan?
A: The output connector is a standard 4-pin PWM connector. Many 3-pin fans can be plugged into a 4-pin connector using the first three pins, though PWM speed control will not function on a 3-pin fan — it will run at a fixed speed based on the voltage output.
Q: What does the adjustable switch on the cable do?
A: The onboard adjustable switch allows you to manually regulate the fan speed, giving you control over airflow and noise levels without needing software or a separate fan controller.