Patent ID: 11862964
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A circuit to protect an overvoltage in a universal serial bus (USB) device, the circuit comprising:
a first overprotection (OVP) switch and a second OVP switch connected in parallel; and
a switch controller, the switch controller including:
a first switch connected to the first OVP switch, and to be selectively connected to a ground voltage or a charge pump, the first switch to turn off the first OVP switch when an overvoltage is detected when the USB device is operating in a normal mode, such that power between a pin and the USB device is interrupted; and
a second switch connected to the second OVP switch, and to be selectively connected to the ground voltage or a positive supply voltage, the second switch to turn off the second OVP switch when the overvoltage is detected and the USB device is operating in a low-power mode, such that power between the pin and the USB device is interrupted, wherein

the first OVP switch has a first on-resistance and the second OVP switch has a second on-resistance, higher than the first on-resistance.