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

7.3.6.1 Autonomous Charging Cycle

When battery charging is enabled (CHG_CONFIG bit = 1 andCE pin is LOW), the device autonomously completes a charging cycle without host involvement. The device default charging parameters are listed in Table 7-2. The host configures the power path and charging parameters by writing to the corresponding registers through I2C.

Table 7-2 Charging Parameter Default Settings
DEFAULT MODE BQ25619/618
Charging voltage 4.20 V
Charging current 340 mA
Pre-charge current 40 mA
Termination current 60 mA
Temperature profile JEITA
Safety timer 10 hours

A new charge cycle starts when the following conditions are valid:

  • Converter starts
  • Battery charging is enabled (CHG_CONFIG bit = 1 and ICHG register is not 0 mA andCE is low)
  • No thermistor fault on TS. (TS pin can be ignored by setting TS_IGNORE bit to 1)
  • No safety timer fault
  • BATFET is not forced to turn off (BATFET_DIS bit = 0)

The device automatically terminates the charging cycle when the charging current is below the termination threshold, the battery voltage is above the recharge threshold, and the device is not in DPM mode or thermal regulation. When a fully charged battery is discharged below recharge threshold (selectable through VRECHG bit), the device automatically starts a new charging cycle. After the charge is done, a toggle of the CE pin or CHG_CONFIG bit initiates a new charging cycle. Adapter removal and replug will also restart a charging cycle.

The STAT output indicates charging status: charging (LOW), charging complete or charge disable (HIGH), or charging fault (blinking). The status register (CHRG_STAT) indicates the different charging phases: 00-charging disable, 01-precharge, 10-fast charge (CC) and constant voltage (CV), 11-charging done. Once a charging cycle is completed, an INT pulse is asserted to notify the host.