The operation voltage range of the TPS2585x-Q1 is up to 26 V. If the input source applies an overvoltage, the buck regulator HSFET/LSFET turns off immediately. Thus, the USB ports and OUT pin loses their power as well. Once the overvoltage returns to a normal voltage, the buck regulator continues switching and provides power on the USB ports and OUT pin.

During the overvoltage condition, the internal regulator regulates the SENSE voltage at 5 V, so the SENSE always has power for the internal bias circuit and external NTC pullup reference.