JAJSL52A april   2020  – february 2021 BQ25968

PRODUCTION DATA  

  1.   1
  2. 特長
  3. アプリケーション
  4. 概要
  5. Revision History
  6. 概要 (続き)
  7. Device Comparison Table
  8. Pin Configuration and Functions
  9. 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 Typical Characteristics
  10. 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  Control State Diagram for System Implementation
      4. 9.3.4  Device Power Up
      5. 9.3.5  Switched Cap Function
        1. 9.3.5.1 Theory of Operation
      6. 9.3.6  Charging Start-Up
      7. 9.3.7  Integrated 16-Bit ADC for Monitoring and Smart Adapter Feedback
      8. 9.3.8  Device Internal Thermal Shutdown, TSBUS, and TSBAT Temperature Monitoring
      9. 9.3.9  INT Pin, STAT, FLAG, and MASK Registers
      10. 9.3.10 CDRVH and CDRVL_ADDRMS Functions
      11. 9.3.11 Parallel Operation Using Master and Slave Modes
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device Modes and Protection Status
        1. 9.4.1.1 Input Overvoltage, Overcurrent, Undercurrent and Short-Circuit Protection
        2. 9.4.1.2 Battery Overvoltage and Overcurrent Protection
        3. 9.4.1.3 Cycle-by-Cycle Current Limit
    5. 9.5 Programming
      1. 9.5.1 F/S Mode Protocol
    6. 9.6 Register Maps
      1. 9.6.1 Customer Registers
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Standalone Application Information (for use with switching charger)
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Parallel BQ25968 for Higher Power Applications
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curve
  12. 11Power Supply Recommendations
  13. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  14. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 サード・パーティ製品に関する免責事項
      2. 13.1.2 Device Nomenclature
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 ドキュメントの更新通知を受け取る方法
    4. 13.4 サポート・リソース
    5. 13.5 Trademarks
    6. 13.6 静電気放電に関する注意事項
    7. 13.7 用語集
  15. 14Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

Charging Start-Up

Prior to enabling charging, set all the protections to the desired thresholds. Protections available are BAT_OVP, BAT_OVP_ALM, BAT_OCP, BAT_OCP_ALM, BAT_UCP_ALM, AC_PROTECTION, BUS_OVP, BUS_OVP_ALM, BUS_OCP_UCP, and BUS_OCP_ALM. These can be found in registers 0x0h through 0x9h. The *_OVP and *_OCP registers set the thresholds where if these conditions are met, the charger stops switching. The *_ALM registers set the thresholds where an interrupt is sent to the host to take actions to avoid reaching the *_OVP or *_OCP thresholds. The settings for the *_ALM registers will depend on the response time required from the host and the operating conditions of the system.

Once the protections have been set, the BUS voltage must be between VBUS_ERROR_LO and VBUS_ERROR_HI in order for the part to start switching. Register 0x0Ah contains the registers to check if these conditions have been met. Typically VBUS_ERROR_LO is 2.05 times VBAT. It is recommended to start with VBUS near this voltage when enabling charge. Once charge has been enabled, the CONV_SWITCHING_STAT bit should be '1', and current will start to flow to the battery. Raising the BUS voltage will increase the current to the battery. If using a current limited source, the voltage can be raised until reaching the current limit. The battery current, IBAT, must reach the IBUS_UCP_THRESHOLD rise threshold within the SS_TIMEOUT_SET time. These parameters can be set in register 0x2Bh. If the IBUS_UCP_THRESHOLD is not met within SS_TIMEOUT_SET, switching stops and the startup sequence must be done again.