Arduino nano 5v pin max current from wall adapter usb

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From this Nano schematic

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  1. The power comes in from the USB connector and goes through a 500mA fuse. So presumably the design is not intended to support > 500mA.
  2. Then it goes through a diode, which will reduce the USB voltage by the forward voltage drop of the diode.
  3. Then it goes to the 5V pin

Edit: Added for step 2, I guess the voltage drop could be about 0.35V, so if your wall adaptor is providing 5V the 5V pin will be 4.65V. The datasheet has a graph in fig 3

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