The bq51003 is an advanced, integrated, receiver IC for wireless power transfer in portable applications. The device provides the AC/DC power conversion while integrating the digital control required to comply with the Qi v1.1 communication protocol. Together with the bq500210 transmitter controller, the bq51003 enables a complete contact-less power transfer system for a wireless power supply solution. By using near-field inductive power transfer, the receiver coil embedded in the portable device receives the power transmitted by the transmitter coil via mutually coupled inductors. The AC signal from the receiver coil is then rectified and regulated to be used as a power supply for down-system electronics. Global feedback is established from the secondary to the transmitter in order to stabilize the power transfer process via back-scatter modulation. This feedback is established by using the Qi v1.1 communication protocol supporting up to 2.5-W applications.

The device integrates a low-impedance full synchronous rectifier, low-dropout regulator, digital control, and accurate voltage and current loops.

• Integrated Wireless Power Supply Receiver Solution - Optimized for 2.5-W Applications
  • 93% Overall Peak AC-DC Efficiency
  • Full Synchronous Rectifier
  • WPC v1.1 Compliant Communication Control
  • Output Voltage Conditioning
  • Only IC Required Between Rx coil and Output
• Wireless Power Consortium (WPC) v1.1 Compliant (FOD Enabled) Highly Accurate Current Sense
• Dynamic Rectifier Control for Improved Load Transient Response
• Dynamic Efficiency Scaling for Optimized Performance Over wide Range of Output Power
• Adaptive Communication Limit for Robust Communication
• Supports 20-V Maximum Input
• Low-power Dissipative Rectifier Overvoltage Clamp (VRECT-OVP = 15 V)
• Thermal Shutdown
• Multifunction NTC and Control Pin for Temperature Monitoring, Charge Complete and Fault Host Control
• 1.9-mm × 3.0-mm DSBGA