SLUSD88A March   2019  – June 2019 BQ25886

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Schematic
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Device Power-On-Reset
      2. 8.3.2  Device Power Up from Battery without Input Source
      3. 8.3.3  Device Power Up from Input Source
        1. 8.3.3.1 Poor Source Qualification
        2. 8.3.3.2 Input Source Type Detection
          1. 8.3.3.2.1 D+/D– Detection Sets Input Current Limit
        3. 8.3.3.3 Power Up REGN Regulator (LDO)
        4. 8.3.3.4 Converter Power Up
      4. 8.3.4  Input Current Optimizer (ICO)
      5. 8.3.5  Buck Mode Operation from Battery (OTG)
      6. 8.3.6  PowerPath Management
        1. 8.3.6.1 Narrow VDC Architecture
        2. 8.3.6.2 Dynamic Power Management
        3. 8.3.6.3 Supplement Mode
      7. 8.3.7  Battery Charging Management
        1. 8.3.7.1 Autonomous Charging Cycle
        2. 8.3.7.2 Battery Charging Profile
        3. 8.3.7.3 Charging Termination
        4. 8.3.7.4 Thermistor Qualification
          1. 8.3.7.4.1 JEITA Guideline Compliance in Charge Mode
        5. 8.3.7.5 Charging Safety Timer
      8. 8.3.8  Status Outputs
        1. 8.3.8.1 Power Good Indicator (PG)
        2. 8.3.8.2 Charging Status Indicator (STAT)
      9. 8.3.9  Input Current Limit on ILIM Pin
      10. 8.3.10 Voltage and Current Monitoring
        1. 8.3.10.1 Voltage and Current Monitoring in Boost Mode
          1. 8.3.10.1.1 Input Over-Voltage Protection
          2. 8.3.10.1.2 Input Under-Voltage Protection
          3. 8.3.10.1.3 System Over-Voltage Protection
          4. 8.3.10.1.4 System Over-Current Protection
        2. 8.3.10.2 Voltage and Current Monitoring in OTG Buck Mode
          1. 8.3.10.2.1 VBUS Over-voltage Protection
          2. 8.3.10.2.2 VBUS Over-Current Protection
      11. 8.3.11 Thermal Regulation and Thermal Shutdown
        1. 8.3.11.1 Thermal Protection in Boost Mode
        2. 8.3.11.2 Thermal Protection in OTG Buck Mode
      12. 8.3.12 Battery Protection
        1. 8.3.12.1 Battery Over-Voltage Protection (BATOVP)
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Inductor Selection
        2. 9.2.2.2 Input (VBUS / PMID) Capacitor
        3. 9.2.2.3 Output (VSYS) Capacitor
        4. 9.2.2.4 ILIM resistor
        5. 9.2.2.5 ICHGSET resistor
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.7.5 Charging Safety Timer

The device has built-in safety timer to prevent extended charging cycle due to abnormal battery conditions.

During input voltage, current or thermal regulation, the safety timer counts at half clock rate as the actual charge current is likely to be below the setting. For example, if the charger is in input current regulation throughout the whole charging cycle, and the safety timer is set to 12 hours, then the timer will expire in 24 hours.

During faults which disable charging, or supplement mode, timer is suspended. Once the fault goes away, safety timer resumes. If the charging cycle is stopped and started again, the timer gets reset.

The safety timer is reset for the following events:

  1. Charging cycle stop and restart (toggle CE pin, or charged battery falls below recharge threshold).
  2. BAT voltage changes from pre-charge to fast-charge or vice versa.

The precharge safety timer (fixed 2hr counter that runs when VBAT < VBAT_LOWV), follows the same rules as the fast-charge safety timer in terms of getting suspended, reset, and counting at half-rate.