SLUSFU9 October   2024 BQ51013C

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description (continued)
  6. 5 Device Comparison Table
  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 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Details of a Qi Wireless Power System and BQ51013C Power Transfer Flow Diagrams
      2. 8.3.2  Dynamic Rectifier Control
      3. 8.3.3  Dynamic Efficiency Scaling
      4. 8.3.4  RILIM Calculations
      5. 8.3.5  Input Overvoltage
      6. 8.3.6  Adapter Enable Functionality and EN1/EN2 Control
      7. 8.3.7  End Power Transfer Packet (WPC Header 0x02)
      8. 8.3.8  Status Outputs
      9. 8.3.9  WPC Communication Scheme
      10. 8.3.10 Communication Modulator
      11. 8.3.11 Adaptive Communication Limit
      12. 8.3.12 Synchronous Rectification
      13. 8.3.13 Temperature Sense Resistor Network (TS)
      14. 8.3.14 3-State Driver Recommendations for the TS/CTRL Pin
      15. 8.3.15 Thermal Protection
      16. 8.3.16 WPC v2.0 Compliance – Foreign Object Detection
      17. 8.3.17 Receiver Coil Load-Line Analysis
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 BQ51013C Wireless Power Receiver Used as a Power Supply
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Using The BQ51013C as a Wireless Power Supply: (See Figure 1-1 )
          2. 9.2.1.2.2 Series and Parallel Resonant Capacitor Selection
          3. 9.2.1.2.3 Recommended RX Coils
          4. 9.2.1.2.4 COMM, CLAMP, and BOOT Capacitors
          5. 9.2.1.2.5 Control Pins and CHG
          6. 9.2.1.2.6 Current Limit and FOD
          7. 9.2.1.2.7 RECT and OUT Capacitance
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Dual Power Path: Wireless Power and DC Input
        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 Wireless and Direct Charging of a Li-Ion Battery at 800 mA
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
  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. 12.1.2 Development Support
    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

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RHL|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.3.2 Detailed Design Procedure

The basic BQ51013C design is identical to the Section 9.2.2. The BQ51013C OUT pin is tied to the output of Q1 and directly to the IN pin of the BQ24040. No other changes to the BQ51013C circuitry are required.

The BQ24040 has a few parameters that need to be programmed for this charger to work properly. Ceramic decoupling capacitors are needed on the IN and OUT pins using the values shown in Figure 9-11. After evaluation during actual system operational conditions, the final values may be adjusted up or down. In high amplitude pulsed load applications, the IN and OUT capacitors will generally require larger values. The next step is setting up the fast charge current and pre-charge and termination current.

Program the Fast Charge Current, ISET: RISET = [KISET/IOUT] = [540 AΩ / 0.8 A] = 675 Ω.

Program the Termination Current, ITERM: RPRE-TERM = [KTERM/%OUT-FC] = 200 Ω/% x 10% = 2 kΩ.

TS Function: To enable the temperature sense function, a 10-kΩ NTC thermistor (103AT) from TS to VSS should be placed in the battery pack. To disable the temperature sense function, use a fixed 10-kΩ resistor between TS and VSS.

Figure 9-12 shows start-up of the wireless system with the BQ24040 charger when TX power is applied after the full RX system has been placed on the charging pad. Channel 1 (yellow) shows the initial power to the TX system. The RECT pin of the BQ51013C is shown on Channel 3 (purple). The output of the BQ24040 is shown on Channel 2 (blue). Battery current can be seen on Channel 4 (green).

Figure 9-13 shows a similar condition but in this case, the battery is not connected initially, so the battery detection routine can be observed. After the battery is connected to the charger, the charge current jumps to 800 mA and the output voltage becomes stable. Both the current out of the BQ51013C (Channel 1, yellow) and the current out of the BQ24040 (Channel 4, green) can be seen.