The +5V output from a USB hub is permitted to range from 4.75V to 5.25V (5V +-5%). For USB2.0 this range is changed to be 4.4V to 5.25V and for USB3.0 the range starts from 4.0V.
The +5V output from a USB hub is permitted to range from 4.75V to 5.25V (5V +-5%). For USB2.0 this range is changed to be 4.4V to 5.25V and for USB3.0 the range starts from 4.0V.