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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机械数据 (封装 | 引脚)
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订购信息

6.3.4 Processor Hot Indication for CPU Throttling

When CPU is running turbo mode, the peak power may exceed total available power from adapter and battery. The BQ24810 provides the PROCHOT output to signal the CPU that an overload condition has occurred. When adapter or battery discharge current exceeds the allowed threshold or system voltage drops, this indicates an overload condition has occurred. Likewise, adapter or battery removal may result in insufficient power for the CPU. The processor hot function in the BQ24810 monitors these events, and optionally asserts the PROCHOT signal when they occur.

The PROCHOT triggering events are:

  • ICRIT: adapter peak current (110% of ILIM2), internal maximum upper limit is 200mV across ACP/ACN voltage.
  • INOM: adapter average current (110% of ILIM1)
  • IDCHG: battery discharge current
  • VBATT: battery voltage on SRP
  • ACOK: upon adapter removal (ACOK pin HIGH to LOW)
  • BATPRES: upon battery removal ( BATPRES pin LOW to HIGH)
  • CMPOUT: Independent comparator output (CMPOUT pin HIGH to LOW)
  • Adapter insertion while battery only boost is active (triggers ICRIT event if enabled.)

The threshold of ICRIT, IDCHG or VBATT, and the deglitch time of ICRIT, INOM, IDCHG or CMPOUT are programmable through SMBus. Each triggering event can be individually enabled in REG0x3D[6:0]. The ICRIT threshold is 110% of the ILIM2 value as set in REG0x3C[14:11]. When ILIM2 is set to a low value, and particularly when the ICRIT deglitch is set to one of the faster values of 10 or 100 uS, the ICRIT PROCHOTmay trip upon adapter insertion due to inrush current. The exact values which may cause this depend on the amount of capacitance on the system rail and the voltage difference between the adapter and battery. Larger capacitance will lead to larger inrush current, as will larger voltage difference between the adapter and battery. This is most likely to be a concern if the ILIM2 value is set to 512 mA or less.

BQ24810 PROCHOT ProfileFigure 6-1 PROCHOT Profile

When any event in PROCHOT profile is triggered, PROCHOT is asserted low for minimum 10 ms (default REG0x3C[4:3]=10). At the end of the 10 ms, if the PROCHOT event is still active, the pulse gets extended.

If multiple PROCHOT events occur while the PROCHOT signal remains asserted low, all of the triggering events are saved in status register REG0x3A[6:0]. If the PROCHOT signal deasserts and then is reasserted, the status register will be cleared upon the new high to low transition of the PROCHOT signal so that only the newly detected event is read. Whenever the host reads REG0x3A, this will also clear all of the flagged events from that register after they are read.