ZHCS384H November   2011  – July 2022 BQ24160 , BQ24160A , BQ24161 , BQ24161B , BQ24163 , BQ24168

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Charge Mode Operation
        1. 8.3.1.1 Charge Profile
        2. 8.3.1.2 PWM Controller in Charge Mode
      2. 8.3.2  Battery Charging Process
      3. 8.3.3  Battery Detection
      4. 8.3.4  Dynamic Power Path Management (DPPM)
      5. 8.3.5  Input Source Connected
      6. 8.3.6  Battery Only Connected
      7. 8.3.7  Battery Discharge FET (BGATE)
      8. 8.3.8  DEFAULT Mode
      9. 8.3.9  Safety Timer and Watchdog Timer (BQ24160/BQ24161/BQ24161B/BQ24163 only)
      10. 8.3.10 D+, D– Based Adapter Detection for the USB Input (D+, D–, BQ24160/0A/3)
      11. 8.3.11 USB Input Current Limit Selector Input (PSEL, BQ24161/161B/168 only)
      12. 8.3.12 Hardware Chip Disable Input (CD)
      13. 8.3.13 LDO Output (DRV)
      14. 8.3.14 External NTC Monitoring (TS)
      15. 8.3.15 Thermal Regulation and Protection
      16. 8.3.16 Input Voltage Protection in Charge Mode
        1. 8.3.16.1 Sleep Mode
        2. 8.3.16.2 Input Voltage Based DPM
        3. 8.3.16.3 Bad Source Detection
        4. 8.3.16.4 Input Overvoltage Protection
        5. 8.3.16.5 Reverse Boost (Boost Back) Prevention Circuit
      17. 8.3.17 Charge Status Outputs (STAT, INT)
      18. 8.3.18 Good Battery Monitor
    4. 8.4 Device Functional Modes
    5. 8.5 Programming
      1. 8.5.1 Serial Interface Description
        1. 8.5.1.1 F/S Mode Protocol
    6. 8.6 Register Maps
      1. 8.6.1 Status/Control Register (READ/WRITE)
      2. 8.6.2 Battery/ Supply Status Register (READ/WRITE)
      3. 8.6.3 Control Register (READ/WRITE)
      4. 8.6.4 Control/Battery Voltage Register (READ/WRITE)
      5. 8.6.5 Vender/Part/Revision Register (READ only)
      6. 8.6.6 Battery Termination/Fast Charge Current Register (READ/WRITE)
      7. 8.6.7 VIN-DPM Voltage/ DPPM Status Register
      8. 8.6.8 Safety Timer/ NTC Monitor Register (READ/WRITE)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Output Inductor and Capacitor Selection Guidelines
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Requirements for SYS Output
    2. 10.2 Requirements for Charging
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 第三方产品免责声明
    2. 12.2 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 术语表
      1.      Mechanical, Packaging, and Orderable Information

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9.2.2.1 Output Inductor and Capacitor Selection Guidelines

When selecting an inductor, several attributes must be examined to find the right part for the application. First, the inductance value should be selected. The BQ2416xx is designed to work with 1.5-µH to 2.2-µH inductors. The chosen value will have an effect on efficiency and package size. Due to the smaller current ripple, some efficiency gain is reached using the 2.2-µH inductor, however, due to the physical size of the inductor, this may not be a viable option. The 1.5-µH inductor provides a good tradeoff between size and efficiency.

Once the inductance has been selected, the peak current must be calculated in order to choose the current rating of the inductor. Use Equation 5 to calculate the peak current.

Equation 5. GUID-2999098F-78C4-45CF-9A9D-254D1094C0FD-low.gif

The inductor selected must have a saturation current rating greater than or equal to the calculated IPEAK. Due to the high currents possible with the BQ2416xx, a thermal analysis must also be done for the inductor. Many inductors have a 40°C temperature-rise rating. The DC component of the current can cause a 40°C temperature rise above the ambient temperature in the inductor. For this analysis, the typical load current may be used adjusted for the duty cycle of the load transients. For example, if the application requires a 1.5-A DC load with peaks at 2.5 A 20% of the time, a Δ40°C temperature rise current must be greater than 1.7 A:

Equation 6. GUID-57D40061-78B0-4C41-AC1D-E3D73E351118-low.gif

The BQ2416xx provides internal loop compensation. Using this scheme, the BQ2416xx is stable with 10 µF to 200 µF of local capacitance on the SYS output. The capacitance on the SYS rail can be higher if distributed amongst the rail. To reduce the output voltage ripple, a ceramic capacitor with the capacitance between 10 µF and 47 µF is recommended for local bypass to SYS. A 47-µF bypass capacitor is recommended for optimal transient response.