SLUSEK7 September   2024 BQ25773

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics BQ2577X
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power-Up Sequence
      2. 7.3.2  MODE Pin Detection
      3. 7.3.3  REGN Regulator (REGN LDO)
      4. 7.3.4  Independent Comparator Function
      5. 7.3.5  Battery Charging Management
        1. 7.3.5.1 Autonomous Charging Cycle
        2. 7.3.5.2 Battery Charging Profile
        3. 7.3.5.3 Charging Termination
        4. 7.3.5.4 Charging Safety Timer
      6. 7.3.6  Temperature Regulation (TREG)
      7. 7.3.7  Vmin Active Protection (VAP) When Battery Only Mode
      8. 7.3.8  Two Level Battery Discharge Current Limit
      9. 7.3.9  Fast Role Swap Feature
      10. 7.3.10 CHRG_OK Indicator
      11. 7.3.11 Input and Charge Current Sensing
      12. 7.3.12 Input Current and Voltage Limit Setup
      13. 7.3.13 Battery Cell Configuration
      14. 7.3.14 Device HIZ State
      15. 7.3.15 USB On-The-Go (OTG)
      16. 7.3.16 Quasi Dual Phase Converter Operation
      17. 7.3.17 Continuous Conduction Mode (CCM)
      18. 7.3.18 Pulse Frequency Modulation (PFM)
      19. 7.3.19 Switching Frequency and Dithering Feature
      20. 7.3.20 Current and Power Monitor
        1. 7.3.20.1 High-Accuracy Current Sense Amplifier (IADPT and IBAT)
        2. 7.3.20.2 High-Accuracy Power Sense Amplifier (PSYS)
      21. 7.3.21 Input Source Dynamic Power Management
      22. 7.3.22 Integrated 16-Bit ADC for Monitoring
      23. 7.3.23 Input Current Optimizer (ICO)
      24. 7.3.24 Two-Level Adapter Current Limit (Peak Power Mode)
      25. 7.3.25 Processor Hot Indication
        1. 7.3.25.1 PROCHOT During Low Power Mode
        2. 7.3.25.2 PROCHOT Status
      26. 7.3.26 Device Protection
        1. 7.3.26.1  Watchdog Timer (WD)
        2. 7.3.26.2  Input Overvoltage Protection (ACOV)
        3. 7.3.26.3  Input Overcurrent Protection (ACOC)
        4. 7.3.26.4  System Overvoltage Protection (SYSOVP)
        5. 7.3.26.5  Battery Overvoltage Protection (BATOVP)
        6. 7.3.26.6  Battery Charge Overcurrent Protection (BATCOC)
        7. 7.3.26.7  Battery Discharge Overcurrent Protection (BATDOC)
        8. 7.3.26.8  BATFET Charge Current Clamp Protection under LDO Regulation Mode
        9. 7.3.26.9  Sleep Comparator Protection Between VBUS and ACP_A (SC_VBUSACP)
        10. 7.3.26.10 High Duty Buck Exit Comparator Protection (HDBCP)
        11. 7.3.26.11 REGN Power Good Protection (REGN_PG)
        12. 7.3.26.12 System Under Voltage Lockout (VSYS_UVP) and Hiccup Mode
        13. 7.3.26.13 OTG Mode Over Voltage Protection (OTG_OVP)
        14. 7.3.26.14 OTG Mode Under Voltage Protection (OTG_UVP)
        15. 7.3.26.15 Thermal Shutdown (TSHUT)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Forward Mode
        1. 7.4.1.1 System Voltage Regulation with Narrow VDC Architecture
        2. 7.4.1.2 Battery Charging
      2. 7.4.2 USB On-The-Go Mode
      3. 7.4.3 Pass Through Mode (PTM)-Patented Technology
      4. 7.4.4 Learn Mode
    5. 7.5 Programming
      1. 7.5.1 I2C Serial Interface
        1. 7.5.1.1 Timing Diagrams
        2. 7.5.1.2 Data Validity
        3. 7.5.1.3 START and STOP Conditions
        4. 7.5.1.4 Byte Format
        5. 7.5.1.5 Acknowledge (ACK) and Not Acknowledge (NACK)
        6. 7.5.1.6 Target Address and Data Direction Bit
        7. 7.5.1.7 Single Read and Write
        8. 7.5.1.8 Multi-Read and Multi-Write
        9. 7.5.1.9 Write 2-Byte I2C Commands
    6. 7.6 BQ25773 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Snubber and Filter for Voltage Spike Damping
        2. 8.2.2.2 ACP-ACN Input Filter
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Input Capacitor
        5. 8.2.2.5 Output Capacitor
        6. 8.2.2.6 Power MOSFETs Selection
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
      1. 10.2.1 Layout Example Reference Top View
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

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発注情報

7.3.7 Vmin Active Protection (VAP) When Battery Only Mode

When only battery is connected and adapter is removed, the system peak power pulse for a 2S or 3S system can be very high if the SoC and motherboard systems spikes coincide. These spikes are expected to be very rare, but possible. During these high power spikes, VSYS voltage could drop lower than minimum system voltage and crash the system considering the impedance of BATFET, charge sensing resistor and battery pack internal resistance. In VAP mode the charger first charges up the voltage of the input decoupling capacitors at VBUS to store a certain amount of energy. During these high system power spikes, the the energy stored in the input capacitors will supplement the system, to prevent the system voltage from dropping below the minimum system voltage and leading the system to black screen. The VAP mode can help to achieve much better Turbo performance for Intel CPU. Overall VAP mode is both a protection mechanism used to keep the system voltage from drooping below its minimum operational voltage and a method to boost Turbo performance by allowing Intel CPU to set a peak power higher than the capability of the battery.

BQ25773 Vmin Active Protection (VAP) Mode Operation Diagram Figure 7-7 Vmin Active Protection (VAP) Mode Operation Diagram

To enter VAP mode follow the steps below:

  • Set VAP input capacitor voltage regulation target in OTG_VOLTAGE().
  • Set VAP mode loading current in OTG_CURRENT().
  • Set VSYS_TH1 as the VSYS threshold to begin VAP shooting.
  • Set VSYS_TH2 as the VSYS threshold to trigger PROCHOT.
  • Set VBUS_VAP_TH as the VBUS threshold to trigger PROCHOT.
  • Set OTG_VAP_MODE=0b to use EN_OTG pin to enabled/disable VAP mode.
  • Remove adapter and pull up EN_OTG pin to enter VAP mode.

When an adapter is plugged in or CPU goes to sleep mode, the host can follow below steps to exit VAP mode:

  • Pull down EN_OTG pin to disable VAP mode
  • Set OTG_VAP_MODE=1b to use EN_OTG pin to enable/disable OTG mode.

EN_OTG pin is used as multi-function pin to enable OTG, VAP and FRS mode. In order to enter VAP mode correctly, refer to Table 7-5 case 7 for reference, note OTG_VAP_MODE=0b should be configured before EN_OTG pin is pulled high. After EN_OTG pin is pulled up, it is not recommended to change OTG_VAP_MODE bit value.