The Arduino Nano 33 BLE datasheet states that a maximum of 1A can be drawn from the 3.3V pin:
However, from the schematic I've taken this screenshot of the Arduino's power supply, showing the voltage regulator (MPM3610) used to produce the 3.3V output:
From the MPM3610 datasheet, it states that the output current is a continuous 1.2A at 3.3V:
Does anyone understand the reason for this missing 0.2A?
Yes, only the board designer.
It is not a good idea to operate equipment at its maximum voltage or current rating.
It could be that although the chip is capable of 1.2A, the thermal limitations of the PCB design prevent full current being achieved.
And because of the mentioned thermal limitations, they might have found, on testing, the regulator limited the output current to 1A to stop the regulator burning.
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