TPD2S300 datasheet(13/37 Pages) TI1

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TPD2S300

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7.3 Feature Description

7.3.1 2-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2 Pins): 24-VDC Tolerant

The TPD2S300 provides 2-channels of Short-to-VBUS Overvoltage Protection for the CC1 and CC2 pins of the

USB Type-C connector. The TPD2S300 is able to handle 24-V DC on its C_CC1 and C_CC2 pins. This is

necessary because according to the USB PD specification, with VBUS set for 20-V operation, the VBUS voltage is

allowed to legally swing up to 21 V, and 21.5 V on voltage transitions from a different USB PD VBUS voltage. The

TPD2S300 builds in tolerance up to 24-VBUS to provide margin above this 21.5 V specification to be able to

support USB PD adaptors that may break the USB PD specification.

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

low resistance in this RLC circuit, ringing up to twice the settling voltage can appear on the connector. More than

2x ringing can be generated if any capacitor on the line derates in capacitance value during the short-to-VBUS

event. This means that more than 44 V could be seen on a USB Type-C pin during a Short-to-VBUS event. The

TPD2S300 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 around 30 V.

Additionally, the overvoltage protection FETs integrated inside the TPD2S300 are 30-V tolerant, therefore being

capable of supporting the high voltage ringing waveform that is experienced during the short-to-VBUS event. The

well designed combination of voltage clamps and 30-V tolerant OVP FETs insures the TPD2S300 can handle

Short-to-VBUS hot-plug events with hot-plug voltages as high as 24-VDC.

The TPD2S300 has an extremely fast turnoff time of 145 ns typical. Furthermore, additional voltage clamps are

placed after the OVP FET on the system side (CC1, CC2) pins of the TPD2S300, to further limit the voltage and

current that is exposed to the USB Type-C CC/PD controller during the 145 ns 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 insure the level of stress seen on the CC1 and CC2 pin during a

short-to-VBUS event is comparable to an HBM ESD event. This is done by design, as any USB Type-C CC/PD

controller has built in HBM ESD protection.

7.3.2 2-Channels of IEC61000-4-2 ESD Protection (CC1, CC2 Pins)

The TPD2S300 integrates 2-Channels of IEC 61000-4-2 system level ESD protection for the CC1 and CC2 pins

of the USB Type-C connector. USB Type-C ports on end-products need system level IEC ESD protection in

order to provide adequate protection for the ESD events that the connector can be exposed to from end users.

High-voltage IEC ESD protection that is 24-V DC tolerant is required for the CC lines in order to simultaneously

support IEC ESD and Short-to-VBUS protection; there are not many discrete market solutions that can provide this

kind of protection. The TPD2S300 integrates this type of high-voltage ESD protection so a system designer can

meet both IEC ESD and Short-to-VBUS protection requirements in a single device.

7.3.3 Low Quiescent Current: 3.23 µA (Typical), VPWR, VM = 3.3 V

The TPD2S300 is designed with a very low quiescent current of 3.23 µA (typical) when VPWR = 3.3 V and VM =

3.3 V. The TPD2S300 is designed to have a very low quiescent current to support applications like smart-phones

where device battery life is crucial. See the Electrical Characteristics table for complete range of quiescent

currents for different VPWR and VM voltages.

7.3.4 CC1, CC2 Overvoltage Protection FETs 200 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

3 V–5.5 V. If supporting VCONN, a VCONN provider must be able to provide 1 W of power to a cable; this translates

into a current range of 200 mA at 5-V VCONN. Therefore, the TPD2S300 has been designed to handle 200 mA of

DC current and to have an RON low enough to provide a specification compliant VCONN voltage to the active

cable.

7.3.5 CC Dead Battery Resistors Integrated for Handling 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 100 W, the USB Type-C connector supporting USB PD can be

used to power a whole new range of mobile devices not previously possible with legacy USB connectors.

TPD2S300 Datasheet(PDF) 13 Page - Texas Instruments

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