SLUSF65B October   2023  – August 2026 BQ25185

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 Thermal Information
    4. 5.4 Recommended Operating Conditions
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
      1. 6.1.1 Battery Charging Process
        1. 6.1.1.1 Trickle Charge
        2. 6.1.1.2 Precharge
        3. 6.1.1.3 Fast Charge
        4. 6.1.1.4 ISET Pin Detection
        5. 6.1.1.5 Termination
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Input Voltage Based Dynamic Power Management (VINDPM)
      2. 6.3.2  Dynamic Power Path Management Mode (DPPM)
      3. 6.3.3  Battery Supplement Mode
      4. 6.3.4  Sleep Mode
      5. 6.3.5  SYS Regulation
      6. 6.3.6  ILIM/VSET Control
      7. 6.3.7  Protection Mechanisms
        1. 6.3.7.1 Input Overvoltage Protection
        2. 6.3.7.2 Battery Undervoltage Lockout
        3. 6.3.7.3 Battery Overcurrent Protection
        4. 6.3.7.4 System Overvoltage Protection
        5. 6.3.7.5 System Short Protection
        6. 6.3.7.6 Thermal Protection and Thermal Regulation
        7. 6.3.7.7 Safety Timer
      8. 6.3.8  Pushbutton Long Press Function
      9. 6.3.9  External NTC Monitoring (TS)
        1. 6.3.9.1 TS Biasing and Function
      10. 6.3.10 Status Pins
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Input Current and Battery Regulation Voltage - ILIM/VSET
        2. 7.2.2.2 Fast Charge Current- ISET
        3. 7.2.2.3 Recommended Passive Components
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.5 SYS Regulation

The BQ25185 includes a SYS voltage regulation loop. By regulating the SYS voltage, the device prevents downstream devices connected to SYS from being exposed to voltages as high as VIN_OVP. SYS regulation is active only when VIN > VUVLO, VIN > VBAT + VSLEEP and VIN < VIN_OVP.

If the ILIM/VSET pin is configured for a VBATREG setting higher than 4.3V, the device regulates the SYS voltage in battery tracking mode. As the battery voltage increases, VSYS is regulated to 225mV above the battery voltage. If the battery voltage is less than 3.6V, VSYS is regulated to VMINSYS. This regulation ensures proper termination of the battery even if VDPPM is active.