SLUSCK6C May   2017  – September 2021 BQ25606

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Device Power Up from Battery without Input Source
      2. 9.3.2 Power Up from Input Source
        1. 9.3.2.1 Power Up REGN Regulation
        2. 9.3.2.2 Poor Source Qualification
        3. 9.3.2.3 Input Source Type Detection
          1. 9.3.2.3.1 D+/D– Detection Sets Input Current Limit in BQ25606
        4. 9.3.2.4 Input Voltage Limit Threshold Setting (VINDPM Threshold)
        5. 9.3.2.5 Converter Power Up
      3. 9.3.3 Boost Mode Operation From Battery
      4. 9.3.4 Power Path Management
        1. 9.3.4.1 Narrow VDC Architecture
        2. 9.3.4.2 Dynamic Power Management
        3. 9.3.4.3 Supplement Mode
      5. 9.3.5 Battery Charging Management
        1. 9.3.5.1 Autonomous Charging Cycle
        2. 9.3.5.2 Charging Termination
        3. 9.3.5.3 Thermistor Qualification
        4. 9.3.5.4 JEITA Guideline Compliance During Charging Mode
        5. 9.3.5.5 Boost Mode Thermistor Monitor during Battery Discharge Mode
        6. 9.3.5.6 Charging Safety Timer
      6. 9.3.6 Status Outputs ( PG, STAT)
        1. 9.3.6.1 Power Good Indicator (PG Pin)
        2. 9.3.6.2 Charging Status Indicator (STAT)
      7. 9.3.7 Protections
        1. 9.3.7.1 Input Current Limit
        2. 9.3.7.2 Voltage and Current Monitoring in Converter Operation
          1. 9.3.7.2.1 Voltage and Current Monitoring in Buck Mode
            1. 9.3.7.2.1.1 Input Overvoltage (ACOV)
            2. 9.3.7.2.1.2 System Overvoltage Protection (SYSOVP)
        3. 9.3.7.3 Voltage and Current Monitoring in Boost Mode
          1. 9.3.7.3.1 VBUS Soft Start
          2. 9.3.7.3.2 VBUS Output Protection
          3. 9.3.7.3.3 Boost Mode Overvoltage Protection
        4. 9.3.7.4 Thermal Regulation and Thermal Shutdown
          1. 9.3.7.4.1 Thermal Protection in Buck Mode
          2. 9.3.7.4.2 Thermal Protection in Boost Mode
        5. 9.3.7.5 Battery Protection
          1. 9.3.7.5.1 Battery Overvoltage Protection (BATOVP)
          2. 9.3.7.5.2 Battery Overdischarge Protection
          3. 9.3.7.5.3 System Overcurrent Protection
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Inductor Selection
        2. 10.2.2.2 Input Capacitor
        3. 10.2.2.3 Output Capacitor
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

5 Description (continued)

The BQ25606 features fast charging with high input voltage support for a wide range of standalone chargers and portable devices. Its input voltage and current regulation deliver maximum charging power to the battery. It also integrates a bootstrap diode for the high-side gate drive for simplified system design.

The device supports a wide range of input sources, including standard USB host port, USB charging port, and USB compliant high voltage adapter. The device sets the default input current limit based on the built-in USB interface. The device is compliant with the USB 2.0 and USB 3.0 power specs with input current and voltage regulation. When the built-in USB interface identifies the input adaptor is unknown, the input current limit of the device is determined by the ILIM pin setting resistor value. The device also meets the USB On-the-Go (OTG) operation power rating specification by supplying 5.15 V on VBUS with a constant current limit up to 1.2 A.

The power path management regulates the system slightly above battery voltage but does not drop below the 3.5-V minimum system voltage. With this feature, the system maintains operation even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the power path management automatically reduces the charge current. As the system load continues to increase, the power path discharges the battery until the system power requirement is met. This Supplement mode prevents overloading the input source.

The device initiates and completes a charging cycle without software control. It senses battery voltage and charges the battery in three phases: pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit and the battery voltage is higher than the recharge threshold. If the fully charged battery falls below the recharge threshold, the charger automatically starts another charging cycle.

The charger provides various safety features for battery charging and system operations including: battery negative temperature coefficient thermistor monitoring, charging safety timer, and overvoltage and overcurrent protections. The thermal regulation reduces charge current when the junction temperature exceeds 110°C. The STAT output reports charging status and any fault conditions. Other safety features include battery temperature sensing for charge and boost mode, thermal regulation and thermal shutdown, and input UVLO and overvoltage protection.

The device is available in a 24-pin, 4 mm x 4 mm QFN package.