WPC 1.1 Compatible Fully Integrated Wireless Power Receiver IC 28-DSBGA # BQ51013BYFPR Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The BQ51013BYFPR is a fully integrated wireless power receiver IC designed for Qi-compliant wireless power transfer systems. Primary applications include:
- Portable Consumer Electronics : Smartphones, tablets, and wearable devices requiring compact wireless charging solutions
- Medical Devices : Hearing aids, implantable medical monitors, and portable diagnostic equipment where connector-free operation is critical
- IoT Devices : Smart home sensors, industrial monitoring equipment, and remote control units requiring maintenance-free operation
- Automotive Accessories : In-car charging pads for mobile devices and embedded systems requiring wireless power delivery
### Industry Applications
- Consumer Electronics : Integration in smartphones and wearables for cable-free charging convenience
- Healthcare : Medical implants and portable monitoring devices requiring hermetic sealing
- Industrial Automation : Sensors and control units in harsh environments where physical connectors are prone to failure
- Automotive : Center console charging systems and embedded telematics units
### Practical Advantages and Limitations
Advantages:
- High Integration : Combines rectifier, voltage regulation, and control logic in a single package (2.7mm × 3.4mm WCSP)
- Efficiency : Up to 85% end-to-end efficiency with optimized power transfer
- Foreign Object Detection : Integrated FOD ensures safe operation by detecting metallic objects
- Thermal Management : Comprehensive thermal protection with overtemperature shutdown
- Compact Footprint : Minimal external components required (typically 10-12 components)
Limitations:
- Power Constraints : Maximum output limited to 5W (5V, 1A) - unsuitable for high-power applications
- Range Limitations : Optimal operation within 5mm coil separation distance
- Compatibility : Restricted to Qi-standard transmitters only
- Thermal Considerations : May require thermal management in high-ambient-temperature environments
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Inadequate Coil Selection
- Issue : Using non-optimized receiver coils resulting in poor efficiency
- Solution : Use TI-recommended coil specifications (6.3μH ±5% typical) with proper Q-factor (>30)
Pitfall 2: Poor Thermal Management
- Issue : Overheating during full-power operation
- Solution : Implement adequate copper pours for heat dissipation and consider thermal vias
Pitfall 3: Incorrect FOD Calibration
- Issue : False triggering or failure to detect foreign objects
- Solution : Precisely calibrate FOD resistors according to application-specific power levels
### Compatibility Issues
Transmitter Compatibility:
- Requires Qi-compliant transmitters (WPC 1.1 or later)
- Incompatible with proprietary wireless charging systems
Battery Management:
- Optimized for single-cell Li-ion/Li-polymer batteries (3.5V to 4.35V)
- Requires external fuel gauge for advanced battery monitoring
System Integration:
- I²C communication for configuration and status monitoring
- Compatible with most system processors through standard digital interfaces
### PCB Layout Recommendations
Power Stage Layout:
- Place decoupling capacitors (C1, C2) within 2mm of VCC and VSS pins
- Use wide traces for power paths (minimum 20 mil width)
- Implement ground plane for improved thermal and EMI performance
RF/Coil Interface:
- Keep AC1/AC2 traces symmetrical and equal length
- Minimize loop area in AC input circuitry
- Route coil connections away from sensitive analog circuits
Thermal Management:
- Use thermal vias under the package for heat dissipation
- Provide adequate copper area for the
