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Power (3V)

The micro:bit is capable of supplying 3V power but only up to a maximum current of 90mA. Exceeding this threshold will cause excessive heating of and potentially damage to the onboard voltage regulator.

The onboard KL26 regulator is rated at a maximum of 120mA when powered from USB and a budget of 30mA is allowed for the nRF51822 and peripherals that make up the micro:bit itself.

The onboard KL26 regulator is not used when powered from battery.

For more information see: https://tech.microbit.org/hardware/powersupply/

Part of pinout.xyz. Not affiliated with the Micro:bit Educational Foundation.
Created by Phil Howard & Joshua Lowe.