TPD4S481-Q1

The TPD4S481-Q1 is a single-chip USB Type-C port protection device that provides 48V short-to-VBUS overvoltage and IEC ESD protection.

Since the release of the USB Type-C connector, many products and accessories for USB Type-C have been released that do not meet the USB Type-C specification. Another concern for USB Type-C is that mechanical twisting and sliding of the connector shorting pins due to the the pins close proximity in the small connector. This mechanical twisting and sliding can cause 48V VBUS to be shorted to the CC and SBU pins. Also due to the proximity of the pins in the Type-C connector, there is a heightened concern that debris and moisture will cause the 48V VBUS pin to be shorted to the CC, SBU, or USB2 pins.

These mehcanical events and non-ideal equipment make it necessary for the CC and other pins to be 48V tolerant, even though the pins only operate at 5V or lower. The TPD4S481-Q1 enables the CC and SBU or USB2 pins to be 48V tolerant without interfering with normal operation by providing over-voltage protection on the CC and SBU pins. The device places high voltage FETs in series on the SBU and CC lines. For systems not utilizing alternate modes with SBU communication, use the SBU pins of the TPD4S481-Q1 to protect the USB2 data lines instead. When a voltage above the OVP threshold is detected on these lines, the high voltage switches are opened up, isolating the rest of the system from the high voltage condition present on the connector.

Finally, most systems require IEC 61000-4-2 system level ESD protection for external pins. The TPD4S481-Q1 integrates IEC 61000-4-2 ESD protection for the CC1, CC2, SBU1, and SBU2 pins, eliminating the need to place high voltage TVS diodes externally on the connector.