How can a Raspberry Pi be powered from a lab power supply via USB?

I have a lab power supply that can easily output 5 V/4 A and I would like to use it to power a Raspberry Pi (version 3B and 3B+).

In theory one could attach the power directly to the +5v pin in the header, but that means bypassing the over-current and over-voltage protection provided by the USB circuitry. Thus I would like to use the USB port.

Is it enough to wire the positive and negative rails of the lab power supply to the +/- pins of a male micro USB connector?

Should the data pins be left unconnected/floating?

1 Answer 1


That should work. The data pins are not connected at the Pi end of the microUSB socket, the socket is purely for power.

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