TIDUEY1C November   2020  – June 2025 BQ25798

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS25751D
      2. 2.3.2 BQ25798
    4. 2.4 System Design Theory
      1. 2.4.1 TPS25751D PD Controller
      2. 2.4.2 BQ25798 Battery Charger
      3. 2.4.3 TPS54531 Buck Converter
      4. 2.4.4 TLV75533 LDO
      5. 2.4.5 USB Type-C® Receptacle
      6. 2.4.6 Supporting Components for Programming
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware and Software Requirements
    2. 3.2 Application Customization Tool
    3. 3.3 Test Setup
    4. 3.4 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Altium Project
    2. 4.2 Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author
  12. 6Revision History

1 System Description

The integrated USB Type-C and USB PD and charging reference design is a USB Type-C and PD controller system along with a battery charging system capable of 66W sinking and up to 45W sourcing. This reference design can support charging 2S to 4S batteries through a USB Type-C port, in addition to the USB Type-C communication and power delivery negotiations.

This board features charging up to 18.8V or 5A, without the need for any external FETs. An external microprocessor is not necessary as the USB-PD controller handles the I2C communications to the battery charger IC to configure the appropriate functionality. Some examples of what the USB-PD controller handles includes setting the charging voltage and current, and configuring the battery charger for OTG or charge mode based off of the active USB Type-C power role.