SLVSF62B November   2020  – September 2021 TPS25858-Q1 , TPS25859-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Switching Characteristics
    8. 8.8 Typical Characteristics
  9. 9 Parameter Measurement Information
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1  Power-Down or Undervoltage Lockout
      2. 10.3.2  Input Overvoltage Protection (OVP) - Continuously Monitored
      3. 10.3.3  Buck Converter
      4. 10.3.4  FREQ/SYNC
      5. 10.3.5  Bootstrap Voltage (BOOT)
      6. 10.3.6  Minimum ON-Time, Minimum OFF-Time
      7. 10.3.7  Internal Compensation
      8. 10.3.8  Selectable Output Voltage (VSET)
      9. 10.3.9  Current Limit and Short Circuit Protection
        1. 10.3.9.1 USB Switch Programmable Current Limit (ILIM)
        2. 10.3.9.2 Interlocking for Two-Level USB Switch Current Limit
        3. 10.3.9.3 Cycle-by-Cycle Buck Current Limit
        4. 10.3.9.4 OUT Current Limit
      10. 10.3.10 Cable Compensation
      11. 10.3.11 Thermal Management With Temperature Sensing (TS) and OTSD
      12. 10.3.12 Thermal Shutdown
      13. 10.3.13 USB Enable On and Off Control (TPS25859-Q1)
      14. 10.3.14 FAULT Indication (TPS25859-Q1)
      15. 10.3.15 USB Specification Overview
      16. 10.3.16 USB Type-C® Basics
        1. 10.3.16.1 Configuration Channel
        2. 10.3.16.2 Detecting a Connection
      17. 10.3.17 USB Port Operating Modes
        1. 10.3.17.1 USB Type-C® Mode
        2. 10.3.17.2 Dedicated Charging Port (DCP) Mode (TPS25858-Q1 Only)
          1. 10.3.17.2.1 DCP BC1.2 and YD/T 1591-2009
          2. 10.3.17.2.2 DCP Divider-Charging Scheme
          3. 10.3.17.2.3 DCP 1.2-V Charging Scheme
        3. 10.3.17.3 DCP Auto Mode (TPS25858-Q1)
    4. 10.4 Device Functional Modes
      1. 10.4.1 Shutdown Mode
      2. 10.4.2 Active Mode
  11. 11Application and Implementation
    1. 11.1 Application Information
    2. 11.2 Typical Applications
      1. 11.2.1 Design Requirements
      2. 11.2.2 Detailed Design Procedure
        1. 11.2.2.1 Output Voltage Setting
        2. 11.2.2.2 Switching Frequency
        3. 11.2.2.3 Inductor Selection
        4. 11.2.2.4 Output Capacitor Selection
        5. 11.2.2.5 Input Capacitor Selection
        6. 11.2.2.6 Bootstrap Capacitor Selection
        7. 11.2.2.7 Undervoltage Lockout Set-Point
        8. 11.2.2.8 Cable Compensation Set-Point
      3. 11.2.3 Application Curves
  12. 12Power Supply Recommendations
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
    3. 13.3 Ground Plane and Thermal Considerations
  14. 14Device and Documentation Support
    1. 14.1 Receiving Notification of Documentation Updates
    2. 14.2 Support Resources
    3. 14.3 Trademarks
    4. 14.4 Electrostatic Discharge Caution
    5. 14.5 Glossary
  15. 15Mechanical, Packaging, and Orderable Information

10.1 Overview

The TPS2585x-Q1 is a full-featured solution for implementing a compact USB charging port with support for both Type-C and BC1.2 standards. The device contains an efficient buck regulator power source. For dual Type-C ports, the TPS2585x-Q1 is capable of providing up to 6.6 A of output current at 5.17 V (nominal), 3 A for each Type-C port, 200 mA for the OUT pin, and 200 mA for each VCONN power. The TPS2585x-Q1 is an automotive-focused USB charging controller and offers a robust solution, so TI recommends to add adequate protection (TVS3300 equivalent or better but auto qualified) on the IN pin to protect systems from high-power transients or lightning strikes.

System designers can optimize efficiency or solution size through careful selection of switching frequency in the range of 200 KHz–450 KHz with sufficient margin to operate below the AM radio frequency band. The TPS2585x-Q1 protects itself with internal thermal sensing circuits that monitor the operating temperature of the junction and disables operation if the temperature exceeds the thermal shutdown threshold. In high ambient temperature application, the 6.6-A output current capability is not assured. In the TPS2585x-Q1, the buck regulator operates in forced PWM mode, ensuring fixed switching frequency regardless of load current. Spread-spectrum frequency dithering reduces harmonic peaks of the switching frequency, potentially simplifying EMI filter design and easing compliance.

Current sensing through a precision FET current sense amplifier on the USB port enables an accurate, user-programmable overcurrent limit setting, and linear cable compensation to overcome IR losses when powering remote USB ports.

The TPS2585x-Q1 includes a TS input for user-programmable thermal protection using a negative temperature coefficient (NTC) resistor.

The device can support the USB Type-C protocol. The TPS25858-Q1 also supports the legacy Battery Charging Specification Rev 1.2 (BC1.2) DCP mode with an auto-detect feature to charge not only BC1.2-compliant handheld devices, but also popular phones and tablets that incorporate their own propriety charging algorithm. The TPS25859-Q1 can enable each port individually and can report fault condition for each port.