SLUSC88A March 2015  – May 2016

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (cont.)
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Timing Requirements
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Functional Block Diagram
    2. 8.2Feature Description
      1. 8.2.1 Device Power-On-Reset (POR)
      2. 8.2.2 Device Power Up from Battery without Input Source
      3. 8.2.3 Device Power Up from Input Source
        1. 8.2.3.1Power Up REGN Regulation (LDO)
        2. 8.2.3.2Poor Source Qualification
        3. 8.2.3.3Input Source Type Detection
          1. 8.2.3.3.1D+/D- Detection Sets Input Current Limit
          2. 8.2.3.3.2Force Input Current Limit Detection
        4. 8.2.3.4Input Voltage Limit Threshold Setting (VINDPM Threshold)
        5. 8.2.3.5Converter Power-Up
      4. 8.2.4 Input Current Optimizer (ICO)
      5. 8.2.5 Boost Mode Operation from Battery
      6. 8.2.6 Power Path Management
        1. 8.2.6.1Narrow VDC Architecture
        2. 8.2.6.2Dynamic Power Management
        3. 8.2.6.3Supplement Mode
      7. 8.2.7 Battery Charging Management
        1. 8.2.7.1Autonomous Charging Cycle
        2. 8.2.7.2Battery Charging Profile
        3. 8.2.7.3Charging Termination
        4. 8.2.7.4Resistance Compensation (IRCOMP)
        5. 8.2.7.5Thermistor Qualification
          1. 8.2.7.5.1Cold/Hot Temperature Window in Charge Mode
          2. 8.2.7.5.2Cold/Hot Temperature Window in Boost Mode
        6. 8.2.7.6Charging Safety Timer
      8. 8.2.8 Battery Monitor
      9. 8.2.9 Status Outputs (STAT, and INT)
        1. 8.2.9.1Charging Status Indicator (STAT)
        2. 8.2.9.2Interrupt to Host (INT)
      10. 8.2.10BATET (Q4) Control
        1. 8.2.10.1BATFET Disable Mode (Shipping Mode)
        2. 8.2.10.2BATFET Enable (Exit Shipping Mode)
        3. 8.2.10.3BATFET Full System Reset
      11. 8.2.11Current Pulse Control Protocol
      12. 8.2.12Input Current Limit on ILIM
      13. 8.2.13Thermal Regulation and Thermal Shutdown
      14. 8.2.14Voltage and Current Monitoring in Buck and Boost Mode
        1. 8.2.14.1Voltage and Current Monitoring in Buck Mode
          1. 8.2.14.1.1Input Overvoltage (ACOV)
          2. 8.2.14.1.2System Overvoltage Protection (SYSOVP)
        2. 8.2.14.2Current Monitoring in Boost Mode
          1. 8.2.14.2.1Boost Mode Overvoltage Protection
      15. 8.2.15Battery Protection
        1. 8.2.15.1Battery Overvoltage Protection (BATOVP)
        2. 8.2.15.2Battery Over-Discharge Protection
        3. 8.2.15.3System Overcurrent Protection
      16. 8.2.16Serial Interface
        1. 8.2.16.1Data Validity
        2. 8.2.16.2START and STOP Conditions
        3. 8.2.16.3Byte Format
        4. 8.2.16.4Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 8.2.16.5Slave Address and Data Direction Bit
        6. 8.2.16.6Single Read and Write
        7. 8.2.16.7Multi-Read and Multi-Write
    3. 8.3Device Functional Modes
      1. 8.3.1Host Mode and Default Mode
    4. 8.4Register 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. 8.4.10REG09
      11. 8.4.11REG0A
      12. 8.4.12REG0B
      13. 8.4.13REG0C
      14. 8.4.14REG0D
      15. 8.4.15REG0E
      16. 8.4.16REG0F
      17. 8.4.17REG10
      18. 8.4.18REG11
      19. 8.4.19REG12
      20. 8.4.20REG13
      21. 8.4.21REG14
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Inductor Selection
        2. 9.2.2.2Buck Input Capacitor
        3. 9.2.2.3System Output Capacitor
      3. 9.2.3Application Curves
    3. 9.3System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Trademarks
    2. 12.2Electrostatic Discharge Caution
    3. 12.3Glossary
  13. 13Mechanical, Packaging, and Orderable Information
    1. 13.1Package Option Addendum
      1. 13.1.1Packaging Information
      2. 13.1.2Tape and Reel Information

1 Features

  • High Efficiency 5-A, 1.5-MHz Switch Mode Buck Charge
    • 93% Charge Efficiency at 2 A and 91% Charge Efficiency at 3 A Charge Current
    • Optimize for High Voltage Input (9 V to 12 V)
    • Low Power PFM mode for Light Load Operations
  • Boost Mode Operation with Adjustable Output from 4.5 V to 5.5 V
    • Selectable 500-KHz to 1.5-MHz Boost Converter with up to 3.1-A Output
    • 93% Boost Efficiency at 5 V at 1 A Output
  • Integrated Control to Switch Between Charge and Boost Mode
  • Single Input to Support USB Input and Adjustable High Voltage Adapters
    • Support 3.9-V to 14-V Input Voltage Range
    • Input Current Limit (100 mA to 3.25 A with 50-mA resolution) to Support USB2.0, USB3.0 standard and High Voltage Adapters
    • Maximum Power Tracking by Input Voltage Limit up-to 14V for Wide Range of Adapters
    • Auto Detect USB SDP, CDP, DCP, and Non-standard Adapters
  • Input Current Optimizer (ICO) to Maximize Input Power without Overloading Adapters
  • Resistance Compensation (IRCOMP) from Charger Output to Cell Terminal
  • Highest Battery Discharge Efficiency with 11-mΩ Battery Discharge MOSFET up to 9 A
  • Integrated ADC for System Monitor
    (Voltage, Temperature, Charge Current)
  • Narrow VDC (NVDC) Power Path Management
    • Instant-on Works with No Battery or Deeply Discharged Battery
    • Ideal Diode Operation in Battery Supplement Mode
  • BATFET Control to Support Ship Mode, Wake Up, and Full System Reset
  • Flexible Autonomous and I2C Mode for Optimal System Performance
  • High Integration includes all MOSFETs, Current Sensing and Loop Compensation
  • 12-µA Low Battery Leakage Current to Support Ship Mode
  • High Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±5% Charge Current Regulation
    • ±7.5% Input Current Regulation
  • Safety
    • Battery Temperature Sensing for Charge and Boost Mode
    • Thermal Regulation and Thermal Shutdown

2 Applications

  • Power Bank, Mobile Wi-Fi Hotspot
  • Wireless Bluetooth Speaker
  • Portable Internet Devices

3 Description

The bq25895 is a highly-integrated 5-A switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer battery. The devices support high input voltage fast charging. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C Serial interface with charging and system settings makes the device a truly flexible solution.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
bq25895WQFN (24)4.00mm x 4.00mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

bq25895 fp_circuit_slusc74.gif

4 Revision History

Changes from * Revision (March 2015) to A Revision

  • Added Pin Configuration and Functions section, ESD Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go