this post was submitted on 17 Aug 2025
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Is that part of the USB standard or just common with many devices?
It's part of the standard. It's slightly different for each USB verision. USB 2.0 starts at 100mA at 5V and the device can negotiate up to 500mA, if the host can deliver.
Usb is 5v standard, it can negotiate something else, then it's called usb-pd