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Small black rectangular DC-to-DC buck converter with USB output, epoxy-potted for waterproofing

Weewooday 12V to 5V 3A 15W 96% Buck Converter USB Power Adapter

SKU CH-S5WV-2QFEV

A compact buck converter steps 12 V vehicle power down to 5 V at up to 3 A with 96 % efficiency and built-in overload protection

  • ColorBlack
  • Weight1.76 ounces
  • Converts 12 V vehicle power to 5 V USB output for charging devices
  • Delivers up to 3 A and 15 W maximum output power for compatible electronics
  • Achieves 96 % conversion efficiency through integrated switching regulator module
  • Intelligent chip provides over-voltage, over-current, over-temperature and short-circuit protection with auto-recovery
  • Flame-retardant potted housing resists water, dust and shock in harsh environments

What this adapter does

This Weewooday buck converter steps a 12 V DC source down to a fixed 5 V USB output rated for 3 A and 15 W. The module uses a synchronous switching regulator that reaches 96 % conversion efficiency and is potted in epoxy resin inside a flame-retardant shell for water, dust and shock resistance. An on-board microcontroller provides over-voltage, over-current, over-temperature and short-circuit protection with automatic recovery. It weighs 1.76 ounces and is supplied new.

Who should use it and who should not

Installers powering GPS units, dash cameras, two-way radios, LCD displays or similar 5 V loads from a vehicle 12 V system will find the wide input range and compact sealed housing convenient. The USB port is not compatible with certain phones, and any device drawing more than 15 W must be excluded. Buyers needing adjustable output voltage, higher current than 3 A or AC mains input should look at other products.

Wiring and integration notes

Connect the input leads to a 12 V DC supply observing polarity; reversed or loose connections can blow the internal fuse. After wiring, insulate all exposed conductors with tape to prevent shorts. The sealed module can be mounted in harsh environments without additional enclosures, freeing space that a bulkier power supply would occupy. No driver installation or software configuration is required.

Highlights

  • Converts 12 V vehicle power to 5 V USB output for charging devices
  • Delivers up to 3 A and 15 W maximum output power for compatible electronics
  • Achieves 96 % conversion efficiency through integrated switching regulator module
  • Intelligent chip provides over-voltage, over-current, over-temperature and short-circuit protection with auto-recovery
  • Flame-retardant potted housing resists water, dust and shock in harsh environments

Specifications

BrandWeewooday
ColorBlack
Weight1.76 ounces

Questions about this item

What power source must I already have to run this 12V to 5V buck converter?

You need a 12 V DC supply such as a vehicle electrical system or a regulated 12 V power supply that can deliver at least 15 W.

Will this converter work reliably alongside the original 12 V wiring in my car?

Yes, it accepts the vehicle's 12 V input, provides 96 % conversion efficiency, and includes over-voltage, over-current, over-temperature and short-circuit protection with automatic recovery.

How can I verify the module is operating correctly after I wire it up?

Measure 5 V at the USB port with a multimeter, confirm your connected device charges or powers on, and check that the converter stays cool during use.

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