ZHCSNF1 February   2021 BQ25960

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Charging System
      2. 9.3.2  Battery Charging Profile
      3. 9.3.3  Device Power Up
      4. 9.3.4  Device HIZ State
      5. 9.3.5  Dual Input Bi-Directional Power Path Management
        1. 9.3.5.1 ACDRV Turn-On Condition
        2. 9.3.5.2 Single Input from VAC to VBUS without ACFET-RBFET
        3. 9.3.5.3 Single Input with ACFET1
        4. 9.3.5.4 Dual Input with ACFET1-RBFET1
        5. 9.3.5.5 Dual Input with ACFET1-RBFET1 and ACFET2-RBFET2
        6. 9.3.5.6 OTG and Reverse TX Mode Operation
      6. 9.3.6  Bypass Mode Operation
      7. 9.3.7  Charging Start-Up
      8. 9.3.8  Adapter Removal
      9. 9.3.9  Integrated 16-Bit ADC for Monitoring and Smart Adapter Feedback
      10. 9.3.10 Device Modes and Protection Status
        1. 9.3.10.1 Input Overvoltage, Overcurrent, Undercurrent, Reverse-Current and Short-Circuit Protection
        2. 9.3.10.2 Battery Overvoltage and Overcurrent Protection
        3. 9.3.10.3 IC Internal Thermal Shutdown, TSBUS, and TSBAT Temperature Monitoring
      11. 9.3.11 INT Pin, STAT, FLAG, and MASK Registers
      12. 9.3.12 Dual Charger Operation Using Primary and Secondary Modes
      13. 9.3.13 CDRVH and CDRVL_ADDRMS Functions
    4. 9.4 Programming
      1. 9.4.1 F/S Mode Protocol
    5. 9.5 Register Maps
      1. 9.5.1 I2C Registers
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Standalone Application Information (for use with main charger)
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 第三方产品免责声明
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 接收文档更新通知
    4. 13.4 支持资源
    5. 13.5 Trademarks
    6. 13.6 静电放电警告
    7. 13.7 术语表
  14. 14Mechanical, Packaging, and Orderable Information

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9.3.2 Battery Charging Profile

The system will have a specific battery charging profile that is unique due to the switched cap architecture. The charging will be controlled by the main charger such as the BQ2561x or BQ2589x until ystem voltage reaches minimum system regulation voltage VSYSMIN. Once the battery voltage reaches VSYSMIN (3.5 V), the adapter can negotiate for a higher bus voltage, enable BQ25960 charging, and regulate the current on VBUS to charge the battery. In the CC phase, the protection in BQ25960 will not regulate the battery voltage, but will provide feedback to the system to increase and decrease current as needed, as well as disable the blocking and switching FETs if the voltage is exceeded. Once the CV point is reached, the BQ25960 will provide feedback to the adapter to reduce the current, effectively tapering the current until a point where the main charger takes over again. The BQ25960 can operate as long as input current is above the BUSUCP threshold.

GUID-20210113-CA0I-9WVS-SQNH-7JWJQH5XT3J3-low.gifFigure 9-2 BQ25960 System Charging Profile