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_0p1F_1V_2p75mA_slusah0.png
VINDC = sourcemeter with VSOURCE = 1.0 V and compliance of 2.75 mA
VBAT connected to 0.1 F depleted supercap
No resistance load on VSTOR
Figure 15. Startup into Depleted Storage Element
BQ25504 load_0p1F_1V_10p5mA_500ohm1_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 1 V and compliance of 10.5 mA
VBAT = 0.1 F supercap
VSTOR = open to 500 Ω to open resistive load (IL = load current on VSTOR)
Figure 17. 5 mA Load Transient on VSTOR
BQ25504 vrdiv_0p1F_1V_10p5mA_2p8vSM1_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 1 V and compliance of 10.5 mA
VBAT = sourcemeter with VSOURCE = 2.8 V and compliance
of 1A
Figure 19. VRDIV Operation
BQ25504 operation_0p1F_1V_10p5mA_2kohm_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 1 V and compliance of 10.5 mA
VBAT = 0.1 F supercap
VSTOR = 2 kΩ resistive load
Figure 16. Boost Charger Operational Waveforms
BQ25504 mppt_0p1F_1V_10p5mA_2p8vSM_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 1 V and compliance of 10.5 mA
VBAT = sourcemeter with VSOURCE = 2.8V and compliance
of 1A
IL = inductor current
Figure 18. MPPT Operation
BQ25504 vbatok_0p1F_1V_2p75mA_1_slusah0.png
VIN_DC = sourcemeter with VSOURCE = 1 V and compliance of 2.75 mA
No storage element on VBAT
VSTOR artificially ramped from 0V to 3.15 V to 0 V using a power amp driven by a function generator
Figure 20. VBAT_OK Operation