SLUSDO8A March   2020  – January 2025 BQ24800

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 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  ProchotOption0 Register
      7. 6.6.7  ProchotOption1 Register
      8. 6.6.8  ProchotStatus Register
      9. 6.6.9  Charge Current Register
      10. 6.6.10 Charge Voltage Register
      11. 6.6.11 Discharge Current Register
      12. 6.6.12 Minimum System Voltage Register
      13. 6.6.13 Input Current Register
      14. 6.6.14 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
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Examples
      1. 9.2.1 Layout Consideration of Current Path
      2. 9.2.2 Layout Consideration of Short Circuit Protection
      3. 9.2.3 Layout Consideration for Short Circuit Protection
  11. 10Device and Documentation Support
    1. 10.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

7.2.1.3 Application Curves

BQ24800 VCC, ACDET, REGN, and ACOK During Power Up
No Battery
Figure 7-4 VCC, ACDET, REGN, and ACOK During Power Up
BQ24800 Charge Enable With Soft Start
Figure 7-6 Charge Enable With Soft Start
BQ24800 Hybrid Power Boost Mode Enabled
Figure 7-8 Hybrid Power Boost Mode Enabled
BQ24800 Converter in Continuous Conduction Mode (CCM) During Charging
Figure 7-10 Converter in Continuous Conduction Mode (CCM) During Charging
BQ24800 Converter in Continuous Conduction Mode During Hybrid Power Boost Mode
Figure 7-12 Converter in Continuous Conduction Mode During Hybrid Power Boost Mode
BQ24800 Input Current Regulation During System Load Transient
VIN = 19.5 VIDPM = 3072 mAVBAT = 11 V
ICHG = 2048 mA
Figure 7-14 Input Current Regulation During System Load Transient
BQ24800 Hybrid Power Boost Mode with Charge Enable, PROCHOT Asserted
VIN = 19.5 VIDPM = 2048 mAICHG = 2048 mA
VBAT = 11 VICRIT 120% x IDPM
PROCHOT pulsewidth 0x3C[4:3] = 11
Figure 7-16 Hybrid Power Boost Mode with Charge Enable, PROCHOT Asserted
BQ24800 Peak Power Mode with PKPWR_ENCHRG=0
VIN = 19.5 VVBAT = 12 VISYS = 6.0 A
ILIM1 = 4096 mAILIM2 = 8192 mA
Figure 7-18 Peak Power Mode with PKPWR_ENCHRG=0
BQ24800 Battery Only Boost Entry and Exit by Battery Voltage
VBATT = 12.0 V to 6.0 VVSysMin() = 10.240 VVBOOST = 2.3 V
ISYS = 1.0 A
Figure 7-20 Battery Only Boost Entry and Exit by Battery Voltage
BQ24800 Power On ACOK Delay at 1st and 2nd Adapter Plug-in
VBAT = 11 V
Figure 7-5 Power On ACOK Delay at 1st and 2nd Adapter Plug-in
BQ24800 Charge Disabled by ILIM
Figure 7-7 Charge Disabled by ILIM
BQ24800 Hybrid Power Boost Mode Doisabled by ILIM
Figure 7-9 Hybrid Power Boost Mode Doisabled by ILIM
BQ24800 Converter in Discontinuous Conduction Mode (DCM) During Charging
Figure 7-11 Converter in Discontinuous Conduction Mode (DCM) During Charging
BQ24800 Converter in Discontinuous Conduction Mode During Hybrid Power Boost Mode
IDPM 4096 mAICHG 2432 mAVBAT 11 V
Figure 7-13 Converter in Discontinuous Conduction Mode During Hybrid Power Boost Mode
BQ24800 Hybrid Power Boost Mode With Charge Enable
VIN = 19.5 VIDPM = 2048 mAVBAT 11 V
Figure 7-15 Hybrid Power Boost Mode With Charge Enable
BQ24800 Hybrid Power Boost Mode With Discharge Current Regulation
VIN = 19.5 VIDPM = 2560 mAVBAT = 11 V
ICHG = 2 AIDCHG = 2048 mA
Figure 7-17 Hybrid Power Boost Mode With Discharge Current Regulation
BQ24800 Peak Power Mode with PKPWR_ENCHRG=1
VIN = 19.5 VVBAT = 12 VISYS = 6.0 A
ILIM1 = 4096 mAILIM2 = 8192 mA
Figure 7-19 Peak Power Mode with PKPWR_ENCHRG=1
BQ24800 Battery Only Boost Exit by Adapter Plug In
VBATT = 9.0 VVSysMin() = 10.24 VVBOOST = 2.3 V
ISYS = 3.0 AVADPT = 20 V
Figure 7-21 Battery Only Boost Exit by Adapter Plug In