When a short-to-VBUS event occurs, ringing happens due to the RLC elements in the hot-plug event. Ringing

up to twice the settling voltage appears on the connector if the resistance is low in the RLC circuit. Ringing

of more than twice the DC level is generated if any capacitor on the line derates in capacitance value during

the short-to-VBUS event. This behavior means that more than 38V is seen on a USB Type-C pin during a

short-to-VBUS event. The TPD4S201 has built in circuit protection to handle this ringing. The diode clamps used

for IEC ESD protection also clamp the ringing voltage during the short-to-VBUS event to limit the peak ringing

to approximately 28V. Additionally, the overvoltage protection FETs integrated inside the TPD4S201 are 28V

tolerant, therefore being capable of supporting the high-voltage ringing waveform that is experienced during the

short-to-VBUS event. The TPD4S201 handles short-to-VBUS hot-plug events with hot-plug voltages as high as

21.5VDC because of the well-designed combination of voltage clamps and 28V tolerant OVP FETs.

The TPD4S201 has an extremely fast turnoff time of 70ns typical. Furthermore, additional voltage clamps are

placed after the OVP FET on the system side (CC1, CC2, SBU1, SBU2) pins of the TPD4S201, to further limit

the voltage and current that are exposed to the USB Type-C CC/PD controller during the 70ns interval while the

OVP FET is turning off. The combination of connector side voltage clamps, OVP FETs with extremely fast turnoff

time, and system side voltage clamps all work together to enable the level of stress seen on a CC1, CC2, SBU1,

or SBU2 pin during a short-to-VBUS event to be less than or equal to an HBM event.

The SBU OVP FETs are designed to be able to optionally protect the DP, DM (USB2.0) pins in lieu of the SBU

pins. Some systems designers also prefer to protect the DP, DM pins from short-to-VBUS events due to the

potential for moisture/water in the connector to short the VBUS pins to DP, DM pins. This protection is applicable

in cases where the end equipment with a USB Type-C connector is trying to be made water-proof. If desiring to

protect the DP, DM pins on the USB Type-C connector from a short-to-VBUS event, connect the C_SBUx pins

to the DP, DM pins on the USB Type-C connector, and the SBUx pins to the USB2.0 pins of the system device

being protected from the short-to-VBUS event.

6.3.2 CC1, CC2 Overvoltage Protection FETs 600-mA Capable for Passing VCONN Power

The CC pins on the USB Type-C connector serve many functions; one of the functions is to be a provider of

power to active cables. Active cables are required when desiring to pass greater than 3 A of current on the VBUS

line or when the USB Type-C port uses the super-speed lines (TX1+, TX2–, RX1+, RX1–, TX2+, TX2–, RX2+,

RX2–). When CC is configured to provide power, it is called VCONN. VCONN is a DC voltage source in the

range of 3V to 5.5V. If supporting VCONN, enable the VCONN provider to have the capability to provide 1.5 W

of power to a cable; this translates into a current range of 273mA to 500mA (depending on the VCONN voltage

level).

When a USB Type-C port is configured for VCONN and using the TPD4S201, this VCONN current flows through

the OVP FETs of the TPD4S201. Therefore, the TPD4S201 has been designed to handle these currents and

have an RON low enough to provide a specification compliant VCONN voltage to the active cable.

6.3.3 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices

An important feature of USB Type-C and USB PD is the ability for this connector to serve as the sole power

source to mobile devices. With support up to 240W, the USB Type-C connector supporting USB PD powers a

whole new range of mobile devices not previously possible with legacy USB connectors.

When the USB Type-C connector is the sole power supply for a battery powered device, enable the device to

charge from the USB Type-C connector even when its battery is dead. In order for a USB Type-C power adapter

to supply power on VBUS, expose RD pulldown resistors on the CC pins. These RD resistors are typically

included inside a USB Type-C CC/PD controller. However, when the TPD4S201 is used to protect the USB

Type-C port, the OVP FETs inside the device isolate these RD resistors in the CC/PD controller when the mobile

device has no power. When the TPD4S201 has no power, the OVP FETs are turned off to provide overvoltage

protection in a dead battery condition. Therefore, the TPD4S201 integrates high-voltage, dead battery RD

pull-down resistors to allow dead battery charging simultaneously with high-voltage OVP protection.

If dead battery support is required, short the RPD_G1 pin to the C_CC1 pin, and short the RPD_G2 pin to the

C_CC2 pin. This short connects the dead battery resistors to the connector CC pins. When the TPD4S201 is

unpowered, and the RP pull-up resistor is connected from a power adapter, this RP pull-up resistor activates

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TPD4S201

SLVSIF2 – JULY 2025

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