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

3 Description

The BQ25185 is a linear battery charger IC optimized for small design size and low quiescent current to extend battery life. The device is available in a small leadless package with a thermal pad for heat dissipation. The device supports up to 1A charging and system loads up to 3.125A.

Package Information
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)BODY SIZE (NOM)
BQ25185DLH (WSON, 10)2.2mm × 2.0mm2.2mm × 2.0mm
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
BQ25185 Simplified SchematicSimplified Schematic

The battery is charged using a standard Li-ion or LiFePO4 charging profile with three phases: precharge, constant current, and constant voltage. Thermal regulation provides the maximum charge current while managing the device temperature. The charger is optimized for battery-to-battery charging with 3V minimum input voltage operation and can withstand 25V absolute maximum line transients. The device integrates a single pushbutton input to reduce the total design footprint.