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

2.4.2 BQ25798 Battery Charger

The BQ25798 is a highly integrated switch-mode buck-boost charger for a 1- to 4-cell Li-ion battery and a Li-polymer battery. The integration includes four switching MOSFETs (Q1, Q2, Q3, and Q4), input and charging current sensing circuits, battery FET (QBAT), and all the loop compensation of the buck-boost converter. This battery charger receives I2C commands from the PD controller to configure the registers appropriately for the desired application. There are sockets to connect the charger to a system as well as a battery.


TIDA-050047 BQ25798 Schematic

Figure 2-5 BQ25798 Schematic