SLUSFF4 November   2023 BQ25756E

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description (continued)
  6. 5 Device Comparison
  7. 6 Pin Configuration and Functions
  8. 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 Timing Requirements
    7. 7.7 Typical Characteristics (BQ25756E)
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Device Power-On-Reset
      2. 8.3.2  Device Power-Up From Battery Without Input Source
      3. 8.3.3  Device Power Up from Input Source
        1. 8.3.3.1 VAC Operating Window Programming (ACUV and ACOV)
        2. 8.3.3.2 REGN Regulator (REGN LDO)
        3. 8.3.3.3 Compensation-Free Buck-Boost Converter Operation
          1. 8.3.3.3.1 Light-Load Operation
        4. 8.3.3.4 Switching Frequency and Synchronization (FSW_SYNC)
        5. 8.3.3.5 Device HIZ Mode
      4. 8.3.4  Battery Charging Management
        1. 8.3.4.1 Autonomous Charging Cycle
          1. 8.3.4.1.1 Charge Current Programming (ICHG pin and ICHG_REG)
        2. 8.3.4.2 Li-Ion Battery Charging Profile
        3. 8.3.4.3 LiFePO4 Battery Charging Profile
        4. 8.3.4.4 Charging Termination for Li-ion and LiFePO4
        5. 8.3.4.5 Charging Safety Timer
        6. 8.3.4.6 CV Timer
        7. 8.3.4.7 Thermistor Qualification
          1. 8.3.4.7.1 JEITA Guideline Compliance in Charge Mode
          2. 8.3.4.7.2 Cold/Hot Temperature Window in Reverse Mode
      5. 8.3.5  Power Management
        1. 8.3.5.1 Dynamic Power Management: Input Voltage and Input Current Regulation
          1. 8.3.5.1.1 Input Current Regulation
            1. 8.3.5.1.1.1 ILIM_HIZ Pin
          2. 8.3.5.1.2 Input Voltage Regulation
            1. 8.3.5.1.2.1 Max Power Point Tracking (MPPT) for Solar PV Panel
      6. 8.3.6  Reverse Mode Power Direction
      7. 8.3.7  Integrated 16-Bit ADC for Monitoring
      8. 8.3.8  Status Outputs (PG, STAT1, STAT2, and INT)
        1. 8.3.8.1 Power Good Indicator (PG)
        2. 8.3.8.2 Charging Status Indicator (STAT1, STAT2 Pins)
        3. 8.3.8.3 Interrupt to Host (INT)
      9. 8.3.9  Protections
        1. 8.3.9.1 Voltage and Current Monitoring
          1. 8.3.9.1.1 VAC Over-voltage Protection (VAC_OVP)
          2. 8.3.9.1.2 VAC Under-voltage Protection (VAC_UVP)
          3. 8.3.9.1.3 Battery Over-voltage Protection (BAT_OVP)
          4. 8.3.9.1.4 Battery Over-current Protection (BAT_OCP)
          5. 8.3.9.1.5 Reverse Mode Over-voltage Protection (REV_OVP)
          6. 8.3.9.1.6 Reverse Mode Under-voltage Protection (REV_UVP)
          7. 8.3.9.1.7 DRV_SUP Under-voltage and Over-voltage Protection (DRV_OKZ)
          8. 8.3.9.1.8 REGN Under-voltage Protection (REGN_OKZ)
        2. 8.3.9.2 Thermal Shutdown (TSHUT)
      10. 8.3.10 Serial Interface
        1. 8.3.10.1 Data Validity
        2. 8.3.10.2 START and STOP Conditions
        3. 8.3.10.3 Byte Format
        4. 8.3.10.4 Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 8.3.10.5 Target Address and Data Direction Bit
        6. 8.3.10.6 Single Write and Read
        7. 8.3.10.7 Multi-Write and Multi-Read
    4. 8.4 Device Functional Modes
      1. 8.4.1 Host Mode and Default Mode
      2. 8.4.2 Register Bit Reset
    5. 8.5 BQ25756E Registers
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Typical Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 ACUV / ACOV Input Voltage Operating Window Programming
          2. 9.2.1.2.2 Charge Voltage Selection
          3. 9.2.1.2.3 Switching Frequency Selection
          4. 9.2.1.2.4 Inductor Selection
          5. 9.2.1.2.5 Input (VAC) Capacitor
          6. 9.2.1.2.6 Output (VBAT) Capacitor
          7. 9.2.1.2.7 Sense Resistor (RAC_SNS and RBAT_SNS) and Current Programming
          8. 9.2.1.2.8 Power MOSFETs Selection
          9. 9.2.1.2.9 Converter Fast Transient Response
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Typical Application (USB-PD EPR Configuration)
        1. 9.2.2.1 Design Requirements
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  14. 13Revision History
  15. 14Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Wide input voltage operating range: 4.2 V to 36 V
  • Wide battery voltage operating range: up-to 36 V with multi-chemistry support:
    • 1- to 7-cell Li-ion charge profile
    • 1- to 9-cell LiFePO4 charge profile
  • Synchronous buck-boost charge controller with NFET drivers
    • Adjustable switching frequency from 200 kHz to 600 kHz
    • Optional synchronization to external clock
    • Integrated loop compensation with soft start
    • Optional gate driver supply input for optimized efficiency
  • Automatic maximum power point tracking (MPPT) for solar charging
  • Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
    • Adjustable input voltage (VAC) regulation from 3.3 V to 36 V with 20-mV/step
    • Adjustable input current regulation (RAC_SNS) from 400 mA to 20 A with 50-mA/step using 5-mΩ resistor
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±3% charge current regulation
    • ±3% input current regulation
  • I2C controlled for optimal system performance with resistor-programmable option
    • Hardware adjustable input and output current limits
  • Integrated 16-bit ADC for voltage, current, and temperature monitoring
  • High safety integration
    • Adjustable input overvoltage and undervoltage protection
    • Battery overvoltage and overcurrent protection
    • Charging safety timer
    • Battery short protection
    • Thermal shutdown
  • Status outputs
    • Adapter present status (PG)
    • Charger operation status (STAT1, STAT2)
  • Package
    • 36-pin 5 mm × 6 mm QFN