TIDUEY1B November   2020  – April 2024 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 TPS25750D
      2. 2.3.2 BQ25798
    4. 2.4 System Design Theory
      1. 2.4.1 TPS25750D 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

2.4.4 TLV75533 LDO

To power on the TPS25750D device when the system needs to source power, the VIN_3V3 input pin must also be supplied. Therefore, the TLV75533 was chosen to provide the 3.3 V needed to power the PD controller. The input is connected to the TPS54531 output of 5 V, which drops down to 3.3 V. However, this input supply is not needed for sink-only applications and so the 3.3 V rail can be omitted as well if that is the case.

GUID-20201019-CA0I-MPW7-5GVG-W9HCRFXPTWJ2-low.gif Figure 2-7 TLV75533 Schematic