SLUSDF8E June   2019  – July 2024

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description (continued)
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 Timing Requirements
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power-On-Reset (POR)
      2. 7.3.2  Device Power Up From Battery Without Input Source
      3. 7.3.3  Power Up From Input Source
        1. 7.3.3.1 Power Up REGN LDO
        2. 7.3.3.2 Poor Source Qualification
        3. 7.3.3.3 Input Source Type Detection (IINDPM Threshold)
          1. 7.3.3.3.1 PSEL Pins Sets Input Current Limit
        4. 7.3.3.4 Input Voltage Limit Threshold Setting (VINDPM Threshold)
        5. 7.3.3.5 Power Up Converter in Buck Mode
        6. 7.3.3.6 HIZ Mode with Adapter Present
      4. 7.3.4  Boost Mode Operation From Battery
      5. 7.3.5  Power Path Management
        1. 7.3.5.1 Narrow VDC Architecture
        2. 7.3.5.2 Dynamic Power Management
        3. 7.3.5.3 Supplement Mode
      6. 7.3.6  Battery Charging Management
        1. 7.3.6.1 Autonomous Charging Cycle
        2. 7.3.6.2 Battery Charging Profile
        3. 7.3.6.3 Charging Termination
        4. 7.3.6.4 Thermistor Qualification
          1. 7.3.6.4.1 JEITA Guideline Compliance During Charging Mode
          2. 7.3.6.4.2 Boost Mode Thermistor Monitor During Battery Discharge Mode
        5. 7.3.6.5 Charging Safety Timer
      7. 7.3.7  Ship Mode and QON Pin
        1. 7.3.7.1 BATFET Disable (Enter Ship Mode)
        2. 7.3.7.2 BATFET Enable (Exit Ship Mode)
        3. 7.3.7.3 BATFET Full System Reset
      8. 7.3.8  Status Outputs (STAT, INT , PMID_GOOD)
        1. 7.3.8.1 Power Good Indicator (PG_STAT Bit)
        2. 7.3.8.2 Charging Status Indicator (STAT)
        3. 7.3.8.3 Interrupt to Host (INT)
        4. 7.3.8.4 PMID Voltage Indicator (PMID_GOOD)
      9. 7.3.9  Protections
        1. 7.3.9.1 Voltage and Current Monitoring in Buck Mode
          1. 7.3.9.1.1 Input Overvoltage Protection (ACOV)
          2. 7.3.9.1.2 System Overvoltage Protection (SYSOVP)
        2. 7.3.9.2 Voltage and Current Monitoring in Boost Mode
          1. 7.3.9.2.1 Boost Mode Overvoltage Protection
          2. 7.3.9.2.2 PMID Overcurrent Protection
        3. 7.3.9.3 Thermal Regulation and Thermal Shutdown
          1. 7.3.9.3.1 Thermal Protection in Buck Mode
          2. 7.3.9.3.2 Thermal Protection in Boost Mode
        4. 7.3.9.4 Battery Protection
          1. 7.3.9.4.1 Battery Overvoltage Protection (BATOVP)
          2. 7.3.9.4.2 Battery Overdischarge Protection
          3. 7.3.9.4.3 System Overcurrent Protection
      10. 7.3.10 Serial Interface
        1. 7.3.10.1 Data Validity
        2. 7.3.10.2 START and STOP Conditions
        3. 7.3.10.3 Byte Format
        4. 7.3.10.4 Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 7.3.10.5 Slave Address and Data Direction Bit
        6. 7.3.10.6 Single Read and Write
        7. 7.3.10.7 Multi-Read and Multi-Write
    4. 7.4 Device Functional Modes
      1. 7.4.1 Host Mode and Default Mode
    5. 7.5 Register Maps
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Inductor Selection
        2. 8.2.2.2 Input Capacitor and Resistor
        3. 8.2.2.3 Output Capacitor
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

7.4.1 Host Mode and Default Mode

The device is a host controlled charger, but it can operate in default mode without host management. In default mode, the device can be used as an autonomous charger with no host or while the host is in sleep mode. When the charger is in default mode, the WATCHDOG_FAULT bit is HIGH. When the charger is in host mode, the WATCHDOG_FAULT bit is LOW.

After power-on-reset, the device starts in default mode with watchdog timer expired, or default mode. All registers are in the default settings.

In default mode, the device keeps charging the battery with the 10-hour fast charging safety timer. At the end of the 10-hour, charging is stopped and the buck converter continues to operate to supply system load. Any write command to the device transitions the charger from default mode to host mode. All device parameters can be programmed by the host. To keep the device in host mode, the host has to reset the watchdog timer by writing a 1 to the WD_RST bit before the watchdog timer expires (WATCHDOG_FAULT bit is set), or disable the watchdog timer by setting the WATCHDOG bits = 00.

All device parameters can be programmed by the host. To keep the device in host mode, the host has to reset the watchdog timer by writing a 1 to the WD_RST bit before the watchdog timer expires (WATCHDOG_FAULT bit is set), or disable the watchdog timer by setting the WATCHDOG bits = 00.

BQ25618 BQ25619 Watchdog Timer Flow ChartFigure 7-15 Watchdog Timer Flow Chart