SLUSB76B February   2013  – May 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Performance Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1  Input Voltage Protection
        1. 8.3.1.1 Input Overvoltage Protection
        2. 8.3.1.2 Bad Adaptor Detection/Rejection
        3. 8.3.1.3 Sleep Mode
        4. 8.3.1.4 Input Voltage Based DPM (Special Charger Voltage Threshold)
      2. 8.3.2  Battery Protection
        1. 8.3.2.1 Output Overvoltage Protection
        2. 8.3.2.2 Battery Short Protection
        3. 8.3.2.3 Battery Detection in HOST Mode
      3. 8.3.3  DEFAULT Mode
      4. 8.3.4  USB Friendly Power Up
      5. 8.3.5  Input Current Limiting at Power Up
      6. 8.3.6  Factory Mode
      7. 8.3.7  Spread Spectrum Mode
      8. 8.3.8  PWM Controller in Charge Mode
      9. 8.3.9  Battery Charging Process
      10. 8.3.10 Thermal Regulation and Protection
      11. 8.3.11 Charge Status Output, STAT Pin
      12. 8.3.12 Control Bits in Charge Mode
        1. 8.3.12.1 CE Bit (Charge Mode)
        2. 8.3.12.2 RESET Bit
        3. 8.3.12.3 OPA_MODE Bit
      13. 8.3.13 Control Pins in Charge Mode
        1. 8.3.13.1 CD Pin (Charge Disable)
      14. 8.3.14 Boost Mode Operation
        1. 8.3.14.1 PWM Controller in Boost Mode
        2. 8.3.14.2 Boost Start Up
        3. 8.3.14.3 PFM Mode at Light Load
        4. 8.3.14.4 Protection in Boost Mode
          1. 8.3.14.4.1 Output Overvoltage Protection
          2. 8.3.14.4.2 Output Overload Protection
          3. 8.3.14.4.3 Battery Overvoltage Protection
        5. 8.3.14.5 STAT Pin in Boost Mode
      15. 8.3.15 High Impedance (Hi-Z) Mode
      16. 8.3.16 Serial Interface Description
        1. 8.3.16.1 F/S Mode Protocol
        2. 8.3.16.2 HS Mode Protocol
        3. 8.3.16.3 I2C Update Sequence
        4. 8.3.16.4 Slave Address Byte
        5. 8.3.16.5 Register Address Byte
    4. 8.4 Device Functional Modes
      1. 8.4.1 Charge Mode Operation
        1. 8.4.1.1 Charge Profile
    5. 8.5 Register Maps
  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 Charge Current Sensing Resistor Selection Guidelines
        2. 9.2.2.2 Output Inductor and Capacitance Selection Guidelines
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 System Load After Sensing Resistor
  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 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Package Summary
      1. 13.1.1 Chip Scale Packaging Dimensions

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Description (continued)

Charge is terminated based on battery voltage and user-selectable minimum current level. During normal operation, the IC automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status can be reported to the host using the I2C interface. During the charging process, the IC monitors its junction temperature (TJ) and reduces the charge current after TJ increases to about 125°C. To support a USB OTG device, bq24157S can provide VBUS (5.05 V) by boosting the battery voltage. The IC is available in 20-pin DSBGA package.