SLUSCK5 March   2017


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
  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 Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Power-On-Reset (POR)
      2. 8.3.2  Device Power Up from Battery without Input Source
      3. 8.3.3  Power Up from Input Source
        1. Power Up REGN Regulation
        2. Poor Source Qualification
        3. Input Source Type Detection
          1. PSEL Pins Sets Input Current Limit in bq25601
        4. Input Voltage Limit Threshold Setting (VINDPM Threshold)
        5. Converter Power-Up
      4. 8.3.4  Boost Mode Operation From Battery
      5. 8.3.5  Host Mode and Standalone Power Management
        1. Host Mode and Default Mode in bq25601
      6. 8.3.6  Power Path Management
      7. 8.3.7  Battery Charging Management
        1.  Autonomous Charging Cycle
        2.  Battery Charging Profile
        3.  Charging Termination
        4.  Thermistor Qualification
        5.  JEITA Guideline Compliance During Charging Mode
        6.  Boost Mode Thermistor Monitor during Battery Discharge Mode
        7.  Charging Safety Timer
        8.  Narrow VDC Architecture
        9.  Dynamic Power management
        10. Supplement Mode
      8. 8.3.8  Shipping Mode and QON Pin
        1. BATFET Disable Mode (Shipping Mode)
        2. BATFET Enable (Exit Shipping Mode)
        3. BATFET Full System Reset
        4. QON Pin Operations
      9. 8.3.9  Status Outputs (PG, STAT, INT)
        1. Power Good indicator (PG Pin and PG_STAT Bit)
        2. Charging Status indicator (STAT)
        3. Interrupt to Host (INT)
      10. 8.3.10 Protections
        1. Voltage and Current Monitoring in Converter Operation
          1. Voltage and Current Monitoring in Buck Mode
            1. Input Overvoltage (ACOV)
            2. System Overvoltage Protection (SYSOVP)
        2. Voltage and Current Monitoring in Boost Mode
          1. VBUS Soft Start
          2. VBUS Output Protection
          3. Boost Mode Overvoltage Protection
        3. Thermal Regulation and Thermal Shutdown
          1. Thermal Protection in Buck Mode
          2. Thermal Protection in Boost Mode
        4. Battery Protection
          1. Battery overvoltage Protection (BATOVP)
          2. Battery Over-Discharge Protection
          3. System Over-Current Protection
      11. 8.3.11 Serial interface
        1. Data Validity
        2. START and STOP Conditions
        3. Byte Format
        4. Acknowledge (ACK) and Not Acknowledge (NACK)
        5. Slave Address and Data Direction Bit
        6. Single Read and Write
        7. Multi-Read and Multi-Write
    4. 8.4 Register Maps
      1. 8.4.1  REG00
      2. 8.4.2  REG01
      3. 8.4.3  REG02
      4. 8.4.4  REG03
      5. 8.4.5  REG04
      6. 8.4.6  REG05
      7. 8.4.7  REG06
      8. 8.4.8  REG07
      9. 8.4.9  REG08
      10. 8.4.10 REG09
      11. 8.4.11 REG0A
      12. 8.4.12 REG0B
  9. Application and Implementation
    1. 9.1 Application information
    2. 9.2 Typical Application Diagram
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. inductor Selection
        2. input Capacitor
        3. Output Capacitor
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Description (continued)

The bq25601 is a highly-integrated 3.0-A switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer battery. It features fast charging with high input voltage support for a wide range of smart phones, tablets and portable devices. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. Its input voltage and current regulation deliver maximum charging power to battery. The solution is highly integrated with input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. It also integrates the bootstrap diode for the high-side gate drive for simplified system design. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

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 default input current limit based on the built-in USB interface. To set the default input current limit, the device takes the result from detection circuit in the system, such as USB PHY device. The device is compliant with USB 2.0 and USB 3.0 power spec with input current and voltage regulation. The device also meets USB On-the-Go (OTG) operation power rating specification by supplying 5.15 V on VBUS with constant current limit up to 1.2A.

The power path management regulates the system slightly above battery voltage but does not drop below 3.5 V minimum system voltage (programmable). 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 to zero. 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 the 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 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 (programmable). The STAT output reports the 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 VBUS_GD bit indicates if a good power source is present. The INT output Immediately notifies host when fault occurs.

The device also provides QON pin for BATFET enable and reset control to exit low power ship mode or full system reset function.

The device is available in 24-pin, 4 mm × 4 mm x 0.75 mm thin WQFN package.