SLVSH00 November   2024 TPD4S480

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings—IEC Specification
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2 Pins or CC1, CC2, DP, DM Pins): 63-VDC Tolerant
      2. 6.3.2 CC1, CC2 Overvoltage Protection FETs 600-mA Capable for Passing VCONN Power
      3. 6.3.3 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices
      4. 6.3.4 EPR Adapter
        1. 6.3.4.1 VBUS Divider
        2. 6.3.4.2 EPR Blocking FET Gate Driver
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
        1. 7.2.1.1 EPR Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 VBIAS Capacitor Selection
        2. 7.2.2.2 Dead Battery Operation
        3. 7.2.2.3 CC Line Capacitance
        4. 7.2.2.4 Additional ESD Protection on CC and SBU Lines
        5. 7.2.2.5 FLT Pin Operation
        6. 7.2.2.6 How to Connect Unused Pins
      3. 7.2.3 EPR Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1.     52

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 can be used to power 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, the device must be able 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, RD pulldown resistors must be exposed on the CC pins. These RD resistors are typically included inside a USB Type-C CC/PD controller. However, when the TPD4S480 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 TPD4S480 has no power, the OVP FETs are turned off to provide overvoltage protection in a dead battery condition. Therefore, the TPD4S480 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 TPD4S480 is unpowered, and the RP pull-up resistor is connected from a power adapter, this RP pull-up resistor activates the RD resistor inside the TPD4S480, and enables VBUS to be applied from the power adapter even in a dead battery condition. Once power is restored back to the system and back to the TPD4S480 on its VPWR pin, the TPD4S480 turns ON its OVP FETs in 3.5ms and then turns OFF its dead battery RD. The TPD4S480 first turns ON its CC OVP FETs fully, and then removes its dead battery RDs to make sure the PD controller RD is fully exposed before removing the RD of the TPD4S480.

If desiring to power the CC/PD controller during dead battery mode and if the CC/PD Controller is configured as a DRP, it is critical that the TPD4S480 be powered before or at the same time that the CC/PD controller is powered. It is also critical that when unpowered, the CC/PD controller also expose its dead battery resistors. When the TPD4S480 gets powered, it exposes the CC pins of the CC/PD controller within 3.5ms, and then removes its own RD dead battery resistors. Once the TPD4S480 turns on, the RD pull-down resistors of the CC/PD controller must be present immediately, in order to maintain a connection. If the power adapter does not see RD present, it can disconnect VBUS. This event removes power from the device with its battery still not sufficiently charged, which consequently removes power from the CC/PD controller and the TPD4S480. Then the RD resistors of the TPD4S480 are exposed again, and connects the VBUS of the power adapter to start the cycle over.

If the CC/PD Controller is configured for DRP and has started to DRP toggle before the TPD4S480 turns on, this DRP toggle is unable to maintain a connection with a power adapter. If the CC/PD controller is configured for DRP, the dead battery resistors of the PD controller need to be exposed as well, and that the resistors remain exposed until the TPD4S480 turns on. This behavior is typically accomplished by powering the TPD4S480 at the same time as the CC/PD controller when powering the CC/PD controller in dead battery operation.

If dead battery charging is not required in your application, connect the RPD_G1 and RPD_G2 pins to ground.