Generation 2 Integrated Wireless Power Receiver Solution, Qi (Wireless Power Consortium) Compliant 28-DSBGA 0 to 125# BQ51013YFFT Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The BQ51013YFFT is a fully integrated wireless power receiver IC designed for Qi-compliant wireless power transfer systems . Primary applications include:
- Portable Electronics : Smartphones, tablets, and wearable devices requiring 5W wireless charging capability
- Medical Devices : Hearing aids, medical sensors, and portable monitoring equipment where connector-free operation is critical
- IoT Devices : Smart home sensors, industrial sensors, and tracking devices requiring maintenance-free operation
- Consumer Accessories : Wireless charging for gaming controllers, smartwatches, and true wireless earbud cases
### Industry Applications
- Consumer Electronics : Integration into smartphones and tablets from major manufacturers
- Healthcare : Medical implants and portable diagnostic equipment requiring sealed enclosures
- Automotive : In-vehicle charging pads and infotainment system accessories
- Industrial : Sensors and monitoring equipment in harsh environments where physical connectors are undesirable
### Practical Advantages
Strengths:
- High Efficiency : Up to 85% end-to-end efficiency with integrated synchronous rectifier
- Compact Solution : Complete receiver in 5mm × 5mm package with minimal external components
- Qi Compliance : Full compliance with WPC 1.2 specification ensures interoperability
- Integrated Protection : Over-voltage, over-current, and thermal protection circuits
- Foreign Object Detection : Supports FOD for safe operation
Limitations:
- Power Limitation : Maximum 5W output restricts use in higher-power applications
- Alignment Sensitivity : Requires precise coil alignment for optimal performance
- Thermal Considerations : May require thermal management in compact enclosures
- Cost Premium : Higher component cost compared to wired charging solutions
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Inadequate Decoupling
- Issue : Poor transient response and stability issues
- Solution : Use 10μF and 1μF ceramic capacitors close to VOUT and VCC pins
Pitfall 2: Improper Coil Selection
- Issue : Reduced efficiency and charging distance
- Solution : Select Qi-compliant receiver coils with appropriate inductance (6-12μH typical)
Pitfall 3: Thermal Management
- Issue : Overheating in compact enclosures
- Solution : Implement thermal vias and ensure adequate airflow or heatsinking
Pitfall 4: PCB Stackup Issues
- Issue : Reduced efficiency due to eddy currents
- Solution : Maintain minimum 0.5mm distance between coil and ground plane
### Compatibility Issues
Transmitter Compatibility:
- Requires Qi v1.2 compliant transmitters
- May have reduced performance with lower-quality third-party transmitters
Battery Compatibility:
- Optimized for single-cell Li-ion/Li-polymer batteries (3.5V to 4.35V)
- Requires external battery management for multi-cell configurations
System Integration:
- I²C communication for system control and status monitoring
- Compatible with most system processors through standard digital interfaces
### PCB Layout Recommendations
Power Stage Layout:
- Place input capacitors (C1, C2) within 2mm of VCC and GND pins
- Use short, wide traces for power paths to minimize resistance and inductance
Signal Integrity:
- Route communication lines (SCL, SDA) away from power switching nodes
- Implement proper ground return paths for analog and digital sections
Thermal Management:
- Use thermal vias under the package connected to ground plane
- Ensure adequate copper area for heat dissipation
- Consider exposed pad soldering for improved thermal performance
Coil Integration:
- Maintain recommended clearance around
