SLUSDF7A January   2020  – February 2022 BQ25616

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  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 Power-On-Reset (POR)
      2. 9.3.2 Device Power Up From Battery Without Input Source
      3. 9.3.3 Power Up From Input Source
        1. 9.3.3.1 Power Up ACFET
        2. 9.3.3.2 Power Up REGN LDO
        3. 9.3.3.3 Poor Source Qualification
        4. 9.3.3.4 Input Source Type Detection (IINDPM Threshold)
          1. 9.3.3.4.1 D+/D– Detection Sets Input Current Limit
        5. 9.3.3.5 Input Voltage Limit Threshold Setting (VINDPM Threshold)
        6. 9.3.3.6 Power Up Converter in Buck Mode
      4. 9.3.4 Boost Mode Operation From Battery
      5. 9.3.5 Standalone Charger
      6. 9.3.6 Power Path Management
        1. 9.3.6.1 Narrow VDC Architecture
        2. 9.3.6.2 Dynamic Power Management
        3. 9.3.6.3 Supplement Mode
      7. 9.3.7 Battery Charging Management
        1. 9.3.7.1 Autonomous Charging Cycle
        2. 9.3.7.2 Battery Charging Profile
        3. 9.3.7.3 Charging Termination
        4. 9.3.7.4 Thermistor Qualification
          1. 9.3.7.4.1 JEITA Guideline Compliance During Charging Mode (BQ25616J)
          2. 9.3.7.4.2 Hot/Cold Temperature Window During Charging Mode (BQ25616)
          3. 9.3.7.4.3 Boost Mode Thermistor Monitor During Battery Discharge Mode
        5. 9.3.7.5 Charging Safety Timer
      8. 9.3.8 Status Outputs ( PG, STAT)
        1. 9.3.8.1 Power Good Indicator ( PG Pin )
        2. 9.3.8.2 Charging Status Indicator (STAT)
      9. 9.3.9 Protections
        1. 9.3.9.1 Input Current Limit
        2. 9.3.9.2 Voltage and Current Monitoring in Buck Mode
          1. 9.3.9.2.1 Input Overvoltage Protection (ACOV)
          2. 9.3.9.2.2 System Overvoltage Protection (SYSOVP)
        3. 9.3.9.3 Voltage and Current Monitoring in Boost Mode
          1. 9.3.9.3.1 Boost Mode Overvoltage Protection
        4. 9.3.9.4 Thermal Regulation and Thermal Shutdown
          1. 9.3.9.4.1 Thermal Protection in Buck Mode
          2. 9.3.9.4.2 Thermal Protection in Boost Mode
        5. 9.3.9.5 Battery Protection
          1. 9.3.9.5.1 Battery Overvoltage Protection (BATOVP)
          2. 9.3.9.5.2 Battery Overdischarge Protection
          3. 9.3.9.5.3 System Overcurrent Protection
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 BQ25616/616J Application without External OVP
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Inductor Selection
          2. 10.2.1.2.2 Input Capacitor and Resistor
          3. 10.2.1.2.3 Output Capacitor
        3. 10.2.1.3 Application Curves
      2. 10.2.2 BQ25616/616J Application with External OVP
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 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 Third-Party Products Disclaimer
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Support Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information
9.3.9.4.1 Thermal Protection in Buck Mode

Besides the battery temperature monitor on the TS pin, the device monitors the internal junction temperature TJ to avoid overheating the chip and limits the IC junction temperature in buck mode. When the internal junction temperature exceeds the thermal regulation limit (110°C), the device lowers down the charge current. During thermal regulation, the actual charging current is usually below the programmed battery charging current. Therefore, termination is disabled, the safety timer runs at half the clock rate.

Additionally, the device has thermal shutdown to turn off the converter and the BATFET when the IC surface temperature exceeds TSHUT 150°C. The BATFET and converter are enabled to recover when IC temperature is 130°C.