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I've been trying to make my own lower-cost power supply for the Raspberry Pi (my cellphone wall adapters don't provide clean enough 5V power for the Pi 3B+) with a 12V wall wart I have laying around and a spare switching regulator.

I have the switching regulator set so it outputs 5.23V while unloaded, but upon being connected to the Pi, the voltage sags to ~4.7V. Given that the target input voltage range for the Pi is ~4.9-5.1V, how high is it safe to set the switching regulator in order to ensure that even its sagged voltage is within the range? Could I safely go to 5.5V unloaded voltage?

ifconfig
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1 Answers1

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The voltage requirement for all model Pi's is 5V +/- 5% (min 4.75V, max 5.25V) which is the USB standard.

Raspberry Pi Power Limitations

As noted by a Raspberry Pi moderator:

if your power supply peaks above 5.25V, it may damage any USB devices connected to it.

https://www.raspberrypi.org/forums/viewtopic.php?t=216219#p1329717

CoderMike
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