SLUS821J October   2008  – May 2017


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  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. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Undervoltage Lockout
      2. 8.3.2 Power On
      3. 8.3.3 Power-Path Management
        1. Input Source Connected - Adapter or USB
          1. Input Voltage Dynamic Power Management, (VIN_DPM)
          2. Dynamic Power Path Management (DPPM)
          3. Battery Supplement Mode
        2. Input Source Not Connected
      4. 8.3.4 Thermal Regulation and Thermal Shutdown
      5. 8.3.5 Battery Pack Temperature Monitoring
        1. Modifying / Extending the Allowable Temperature Range for Charging
    4. 8.4 Device Functional Modes
      1. 8.4.1 Battery Charging
        1. Charge Current Translator
        2. Battery Detection and Recharge
        3. Termination Disable (TD Input, bq24230)
        4. Adjustable Termination Threshold (ITERM Input, bq24232)
        5. Dynamic Charge Timers (TMR Input)
        6. Status Indicators (PGOOD, CHG)
          1. Timer Fault
      2. 8.4.2 Explanation of Deglitch Times and Comparator Hysteresis
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Using The bq24232 In A Stand-Alone Charger Application
        1. Design Requirements
        2. Detailed Design Procedure
          1. Calculations
            1. Program The Fast-Charge Current (ISET):
            2. Program The Input Current Limit (ILIM)
            3. Program The Termination Current Threshold (ITERM, bq24232)
            4. Program 7.5-hour Fast-Charge Safety Timer (TMR)
          2. TS Function
          3. CHG and PGOOD
          4. Selecting In, Out, and BAT Pin Capacitors
        3. Application Curves
      2. 9.2.2 Using The bq24230 in a Host Controlled Charger Application
        1. Design Requirements
        2. Detailed Design Procedure
        3. Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Requirements for OUT Output
    2. 10.2 USB Sources and Standard AC Adapters
    3. 10.3 Half-Wave Adapters
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Package
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Power Supply Recommendations

Requirements for OUT Output

In order to provide an output voltage on SYS, the bq2423x require either a power supply between 4.35 V and 6.0 V input for bq24230 and between 4.35V and 10V for bq24232 to fully charge a battery. The supply must have at least 100 mA current rating connected to IN; or, a single-cell Li-Ion battery with voltage around 2.2 V connected to BAT. The source current rating needs to be at least 1.5 A in order to provide maximum output current to SYS.

USB Sources and Standard AC Adapters

In order for charging to occur the source voltage measured at the IN terminals of the IC, factoring in cable/trace losses from the source, must be greater than the VINDPM threshold (in USB mode), but less than the maximum values shown above. The current rating of the source must be higher than the load requirements for OUT in the application. For charging at a desired charge current of ICHRG, IIN > (ISYS+ ICHRG). The charger limits IIN to the current limit setting of EN1/EN2.

Half-Wave Adapters

Some low-cost adapters implement a half rectifier topology, which causes the adapter output voltage to fall below the battery voltage during part of the cycle. To enable operation with low-cost adapters under those conditions, the bq2423x family keeps the charger on for at least 20 ms (typical) after the input power puts the part in sleep mode. This feature enables use of external low-cost adapters using 50-Hz networks.