SLUSFR7 August   2025 BQ24810

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Device Power Up
        1. 6.3.1.1 Battery Only
        2. 6.3.1.2 Adapter Detect and ACOK Output
          1. 6.3.1.2.1 Adapter Overvoltage (ACOV)
        3. 6.3.1.3 REGN LDO
      2. 6.3.2 System Power Selection
      3. 6.3.3 Current and Power Monitor
        1. 6.3.3.1 High Accuracy Current Sense Amplifier (IADP and IDCHG)
        2. 6.3.3.2 High Accuracy Power Sense Amplifier (PMON)
      4. 6.3.4 Processor Hot Indication for CPU Throttling
      5. 6.3.5 Input Current Dynamic Power Management
        1. 6.3.5.1 Setting Input Current Limit
      6. 6.3.6 Two-Level Adapter Current Limit (Peak Power Mode)
      7. 6.3.7 EMI Switching Frequency Adjust
      8. 6.3.8 Device Protections Features
        1. 6.3.8.1 Charger Timeout
        2. 6.3.8.2 Input Overcurrent Protection (ACOC)
        3. 6.3.8.3 Charge Overcurrent Protection (CHG_OCP)
        4. 6.3.8.4 Battery Overvoltage Protection (BATOVP)
        5. 6.3.8.5 Battery Short
        6. 6.3.8.6 Thermal Shutdown Protection (TSHUT)
        7. 6.3.8.7 Inductor Short, MOSFET Short Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Battery Charging in Buck Mode
        1. 6.4.1.1 Setting the Charge Current
        2. 6.4.1.2 Setting the Charge Voltage
        3. 6.4.1.3 Automatic Internal Soft-Start Charger Current
      2. 6.4.2 Hybrid Power Boost Mode
      3. 6.4.3 Battery Only Boost Mode
        1. 6.4.3.1 Setting AC_PLUG_EXIT_DEG in Battery Only Boost Mode
        2. 6.4.3.2 Setting Minimum System Voltage in Battery Only Boost Mode
      4. 6.4.4 Battery Discharge Current Regulation in Hybrid Boost Mode and Battery Only Boost Mode
      5. 6.4.5 Battery LEARN Cycle
      6. 6.4.6 Converter Operational Modes
        1. 6.4.6.1 Continuous Conduction Mode (CCM)
        2. 6.4.6.2 Discontinuous Conduction Mode (DCM)
        3. 6.4.6.3 Non-Sync Mode and Light Load Comparator
    5. 6.5 Programming
      1. 6.5.1 SMBus Interface
        1. 6.5.1.1 SMBus Write-Word and Read-Word Protocols
        2. 6.5.1.2 Timing Diagrams
    6. 6.6 Register Maps
      1. 6.6.1  Battery-Charger Commands
      2. 6.6.2  Setting Charger Options
        1. 6.6.2.1 ChargeOption0 Register
      3. 6.6.3  ChargeOption1 Register
      4. 6.6.4  ChargeOption2 Register
      5. 6.6.5  ChargeOption3 Register
      6. 6.6.6  ChargeOption4 Register
      7. 6.6.7  ProchotOption0 Register
      8. 6.6.8  ProchotOption1 Register
      9. 6.6.9  ProchotStatus Register
      10. 6.6.10 Charge Current Register
      11. 6.6.11 Charge Voltage Register
      12. 6.6.12 Discharge Current Register
      13. 6.6.13 Minimum System Voltage Register
      14. 6.6.14 Input Current Register
      15. 6.6.15 Register Exceptions
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Typical System Schematic
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1  Adapter Current Sense Filter
          2. 7.2.1.2.2  Negative Output Voltage Protection
          3. 7.2.1.2.3  Reverse Input Voltage Protection
          4. 7.2.1.2.4  Reduce Battery Quiescent Current
          5. 7.2.1.2.5  CIN Capacitance
          6. 7.2.1.2.6  L1 Inductor Selection
          7. 7.2.1.2.7  CBATT Capacitance
          8. 7.2.1.2.8  Buck Charging Internal Compensation
          9. 7.2.1.2.9  CSYS Capacitance
          10. 7.2.1.2.10 Battery Only Boost Internal Compensation
          11. 7.2.1.2.11 Power MOSFETs Selection
          12. 7.2.1.2.12 Input Filter Design
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Migration from Previous Devices (Does Not Support Battery Only Boost)
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
          1. 7.2.2.2.1 CSYS Capacitance
        3. 7.2.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Examples
        1. 7.4.2.1 Layout Consideration of Current Path
        2. 7.4.2.2 Layout Consideration of Short Circuit Protection
        3. 7.4.2.3 Layout Consideration for Short Circuit Protection
  9. 8 Device and Documentation Support
    1. 8.1 Third-Party Products Disclaimer
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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6.3.5 Input Current Dynamic Power Management

The BQ24810 employs dynamic power management to reduce charging current to maintain a maximum adapter current ILIM1, set in REG0x3F(). If the system current requirement exceeds ILIM1, the charger will enter peak power mode (if enabled) as described in Section 6.3.6. If peak power mode is not enabled, the charger will instead enter hybrid boost (if enabled and all required conditions are met) as described in Section 6.4.2. If neither peak power mode nor hybrid boost is entered, the adapter current may exceed ILIM1, potentially generating an INOM or ICRIT PROCHOT or ACOC event.

The BQ24810 features improved precision in both ILIM1 and the FDPM_RISE threshold used to enter hybrid boost mode. REG0x3F() allows setting ILIM1 in increments of 64 mA.

Typically there are mainly two kinds of adapters which BQ24810 can support, however they do requests configuration in an opposite direction based on their own characteristics. In order to achieve the best performance of both of them, BQ24810 reserve flexibility to adjust charger turbo boost mode entry and charger current ramp up process accordingly. These are summarized in Table 6-2.

The BQ24810 has several user registers that can speed up the hybrid power boost mode and charging entry/exit times. These key registers can have effects on the adapter input current, battery discharge current, and the battery charge current transients. These are summarized in Table 6-3, where tradeoffs can be made between minimizing overshoot of adapter or battery currents, and transition speeds for HPB and ICHG mode.

Table 6-2 Recommended Hybrid Power Boost Mode and Charge Current Ramp Up Setting for Different Input Sources
ADAPTER TYPE DEDICATED BARREL ADAPTER THIRD PARTY PD ADAPTER
Characteristic Robust and capable to handle 500us 1.5ms current overshoot. Key requests:
  • Quick ICHG recovery after system load removal
  • Maximize adapter output power
  • Conservative to enter turbo boost
 Sensitive and precise current limit and possible to crash due to overcurrent. Key requests:
  • Minimize charger input current overshoot
  • Fast to enter turbo boost mode
Typical IINDPM setting under 10mΩ RAC 3.25A~10A 2A~5A
Typical IINDPM setting under 5mΩ RAC 5A~20A 2A~5A
FDPM_RISE (REG0x36[4:2]) higher threshold setting like 107%/111% lower threshold setting like 104%
FDPM_FALL(REG0x36[1:0]) Threshold to exit turbo boost mode: Suggest to use 96% (11b)/95%(10b) lower threshold setting like 93%/90%
FDPM_DEG(REG0x37[5:3]) Longer setting like 380us/750us/1.5ms to maximum power from adapter Shorter setting like 10us/20us/50us to speed up turbo boost mode entry and minimize input current overshoot
EN_ICHG_PRESET(REG0x36[15]) 1b to speed up ICHG ramp up after exit turbo 1b to speed up ICHG ramp up after exit turbo
SEL_MORE_PRESET(REG0x36[13:12])
  • 00b for ICHG<10A
  • 01b for 10A< ICHG
  • 00b for ICHG<10A
  • 01b for 10A< ICHG
EN_CHARGE_FAST_TRANS(REG0x36[10]) 1b to speed up charge current ramp up 0b to minimize ovecurrent at input
EN_TURBO_FAST_TRANS(REG0x36[11]) 0b to maximize power from adapter 1b to minimize ovecurrent at input
MORE_TURBO_PRESET(REG0x3B[2]) 0b to help reduce IIN undershoot and IBAT discharge overshoot during Turbo 1b to help reduce IIN overshoot and may increase IBAT discharge overshoot during Turbo
FAST_CHG_TURBO_TRANS(REG0x37[0]) 0b to help reduce IIN undershoot and IBAT discharge overshoot during Turbo 1b to help reduce IIN overshoot and may increase IBAT discharge overshoot during Turbo
Table 6-3 Key User Registers Impact on Turbo Boost + Charging Performance Summary
REGISTER NAMES ADAPTER INPUT CURRENT BATTERY DISCHARGE CURRENT BATTERY CHARING CURRENT
FDPM_DEG(REG0x37[5:3]) Longer options help maximize output power from barrel adatper and shorter options help minimize input current overshoot for PD adapters Longer options help reduce battery discharge current and extend battery life. Shorter options help increase battery discharge current to avoid crash input source NA
EN_ICHG_PRESET(REG0x36[15]) NA NA Enable to speed up ICHG recover speed significantly after charger exit turbo boost
SEL_MORE_PRESET(REG0x36[13:12]) More preset value could slightly reduce IIN overshoot time and also increase undershoot value More preset value could slightly increase battery discharge current overshoot Working together with EN_ICHG_PRESET, when it is enabled more preset value to help speed up ICHG recover speed after exiting turbo boost
EN_CHARGE_FAST_TRANS(REG0x36[10]) NA NA Enable to speed up ICHG recovery speed
EN_TURBO_FAST_TRANS(REG0x36[11]) Enable(1b) to reduce IIN overshoot duration and slightly increase IIN undershoot as side effect Enable(1b) to increase battery discharge current overshoot NA
MORE_TURBO_PRESET(REG0x3B[2]) 1b to add more preset value for turbo boost ramp which slightly reduce IIN overshoot time and also increase undershoot value 1b to add more preset value for turbo boost ramp can can increase IBAT discharge overshoot NA
FAST_CHG_TURBO_TRANS(REG0x37[0]) Enable(1b) to reduce IIN overshoot Enable(1b) to increase battery dicharge current overshoot NA
TURBO_SPEED(REG0x36[9:8]) Higher codes with stronger compensation to reduce IIN overshoot time and increase IIN undershoot Higher codes with stronger compensation to increase battery discharge overshoot NA