SLUSAH0F October   2011  – November 2019 BQ25504

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Solar Application Circuit
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
    1.     Pin 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 Maximum Power Point Tracking
      2. 8.3.2 Battery Undervoltage Protection
      3. 8.3.3 Battery Overvoltage Protection
      4. 8.3.4 Battery Voltage in Operating Range (VBAT_OK Output)
      5. 8.3.5 Nano-Power Management and Efficiency
    4. 8.4 Device Functional Modes
      1. 8.4.1 Cold-Start Operation (VSTOR < VSTOR_CHGEN, VIN_DC > VIN(CS) and PIN > PIN(CS))
      2. 8.4.2 Main Boost Charger Enabled (VSTOR > VSTOR_CHGEN, VIN_DC > VIN(DC) and EN = LOW )
      3. 8.4.3 Thermal Shutdown
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Storage Element Selection
      2. 9.1.2 Inductor Selection
      3. 9.1.3 Capacitor Selection
        1. 9.1.3.1 VREF_SAMP Capacitance
        2. 9.1.3.2 VIN_DC Capacitance
        3. 9.1.3.3 VSTOR Capacitance
        4. 9.1.3.4 Additional Capacitance on VSTOR or VBAT
    2. 9.2 Typical Applications
      1. 9.2.1 Solar Application Circuit
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 TEG Application Circuit
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
      3. 9.2.3 MPPT Disabled, Low Impedance Source Application Circuit
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Zip Files
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Application Curves

BQ25504 startup_2VIN_1MA_50kOHM_slusah0.png
VINDC = sourcemeter with VSOURCE = 2.0 V and compliance
of 1 mA
VBAT connected to LiIon battery
VSTOR = 50 kΩ resistor
Figure 22. Startup by Attaching Charged Storage Element
BQ25504 LOAD_2VIN_1MA_50OHM_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 2.0 V and compliance of 1 mA
VBAT connected to LiIon battery
VSTOR = open to 50Ω to open resistive load (IL = load current on VSTOR)
Figure 24. 50 mA Load Transient on VSTOR
BQ25504 VRDIV_2VIN_1MA_100kOHM_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 2.0 V and compliance of 1 mA
VBAT connected to LiIon battery
Figure 26. VRDIV Operation
BQ25504 operation_2VIN_100MA_100kOHM1_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 2.0 V and compliance of 100 mA
VBAT connected to LiIon battery
VSTOR = 100 kΩ resistive load (IL = inductor current)
Figure 23. Boost Charger Operational Waveforms
BQ25504 mppt_2VIN_1MA_100kOHM_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 2.0 V and compliance of 1 mA
VBAT connected to LiIon battery
IL = inductor current
Figure 25. MPPT Operation
BQ25504 VBATOK_2VIN_1MA_100kOHM_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 2.0 V and compliance of 1 mA
No storage element on VBAT
VSTOR artificially ramped from 0V to 4.25V to 0V using a power amp driven by a function generator
Figure 27. VBAT_OK Operation