SLVSEL9 June   2018 TPD8S300A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     CC and SBU Over-Voltage Protection
    2.     CC and DP/DM Over-Voltage Protection
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings—JEDEC Specification
    3. 7.3 ESD Ratings—IEC Specification
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Thermal Information
    6. 7.6 Electrical Characteristics
    7. 7.7 Timing Requirements
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2 Pins or CC1, CC2, DP, DM Pins): 24-VDC Tolerant
      2. 8.3.2 8-Channels of IEC 61000-4-2 ESD Protection (CC1, CC2, SBU1, SBU2, DP_T, DM_T, DP_B, DM_B Pins)
      3. 8.3.3 CC1, CC2 Overvoltage Protection FETs 600 mA Capable for Passing VCONN Power
      4. 8.3.4 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices
      5. 8.3.5 Advantages over TPD8S300
        1. 8.3.5.1 Improved Dead Battery Performance
        2. 8.3.5.2 USB Type-C Port Stays Connected during an IEC 61000-4-2 ESD Strike
      6. 8.3.6 3-mm × 3-mm WQFN Package
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 VBIAS Capacitor Selection
        2. 9.2.2.2 Dead Battery Operation
        3. 9.2.2.3 CC Line Capacitance
        4. 9.2.2.4 Additional ESD Protection on CC and SBU Lines
        5. 9.2.2.5 FLT Pin Operation
        6. 9.2.2.6 How to Connect Unused Pins
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.2.1 VBIAS Capacitor Selection

As noted in the Recommended Operating Conditions table, a minimum of 35-VBUS rated capacitor is required for the VBIAS pin, and a 50-VBUS capacitor is recommended. The VBIAS capacitor is in parallel with the central IEC diode clamp integrated inside the TPD8S300A. A forward biased hiding diode connects the VBIAS pin to the C_CCx and C_SBUx pins. Therefore, when a Short-to-VBUS event occurs at 20 V, 20-VBUS minus a forward biased diode drop is exposed to the VBIAS pin. Additionally, during the short-to-VBUS event, ringing can occur almost double the settling voltage of 20 V, allowing a potential 40 V to be exposed to the C_CCx and C_SBUx pins. However, the internal IEC clamps limit the voltage exposed to the C_CCx and C_SBUx pins to around 30 V. Therefore, at least 35-VBUS capacitor is required to insure the VBIAS capacitor does not get destroyed during Short-to-VBUS events.

A 50-V, X7R capacitor is recommended, however. This is to further improve the derating performance of the capacitors. When the voltage across a real capacitor is increased, its capacitance value derates. The more the capacitor derates, the greater than 2x ringing can occur in the short-to-VBUS RLC circuit. 50-V X7R capacitors have great derating performance, allowing for the best short-to-VBUS performance of the TPD8S300A.

Additionally, the VBIAS capacitor helps pass IEC 61000-4-2 ESD strikes. The more capacitance present, the better the IEC performance. So the less the VBIAS capacitor derates, the better the IEC performance. Table 3 shows real capacitors recommended to achieve the best performance with the TPD8S300A.

Table 3. Design Parameters

CAPACITOR SIZE PART NUMBER
0402 CC0402KRX7R9BB104
0603 GRM188R71H104KA93D