UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output

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Your power supply problems just got SOLVED! This little circuit board may look tiny but inside is a high-efficiency DC/DC step-down converter that can output up to 3 Amp at 5V without the need of any heat-sink or forced cooling (It does get a bit toasty at 3A though).

UBEC stands for "universal battery eliminator circuit" and this UBEC is designed to replace a 5V supply in RC planes and 'copters but its also great for any kind of microcontroller or electronics project that runs off of 5V. We tried a half dozen different 'BECs and found this one to be the best in terms of range and stability. You can check the technical tab for the analysis of input/output range and current draw.

To use, connect 6V up to 16V (recommended) to the IN-side wires (the bare wires) and 5V will be generated on the OUT-side wires (the pin header).

You'll get 5V (+-5%) regulated output from a higher voltage input. 3A output current, 5A peak - if you're trying to draw 3A you'll need to give it a little more than 6V though, 7V works well. The UBEC has built-in filter capacitors on the input and output, but it's a switching supply so it's a little noisy compared to a linear regulator.


What goes where?

  • Bare wires = input
  • Pin header end = output



Here are some numbers we found when attaching various loads to the UBEC:

Iout Vin Iin Vout

0.5A 6V 0.47A 4.9V

0.5A 7V 0.39A 5.2V

0.5A 9V 0.35A 5.2V

0.5A 12V 0.28A 5.25V

Iout Vin Iin Vout

1A 6V 0.9A 4.8V

1A 7V 0.79A 5.2V

1A 9V 0.67A 5.1V

1A 12V 0.52A 5.2V

Iout Vin Iin Vout

2A 6V 1.85A 4.9V

2A 7V 1.67A 5.1V

2A 9V 1.28A 5.0V

2A 12V 0.97A 4.9V

Iout Vin Iin Vout

3A 7V 2.6A 5.0V

3A 9V 1.88A 4.7V

3A 12V 1.43A 4.8V

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