Texas Instruments' bq51050B device is a high-efficiency, Qi-compliant, wireless power receiver with an integrated, Li-Ion/Li-Pol battery charge controller for portable applications. The bq51050B devices provide efficient AC-DC power conversion, integrate the digital controller required to comply with Qi v1.1 communication protocol, and provide all necessary control algorithms needed for efficient and safe Li-Ion and Li-Pol battery charging. Together with the bq500212A transmitter-side controller, the bq51050B enables a complete wireless power transfer system for direct battery-charger solutions. By using near-field inductive power transfer, the receiver coil embedded in the portable device can pick up the power transmitted by the transmitter coil. The AC signal from the receiver coil is then rectified and conditioned to apply power directly to the battery.  Global feedback is established from the receiver to the transmitter to stabilize the power transfer process.  This feedback is established by using the Qi v1.1 communication protocol.

The bq51050B devices integrate a low-impedance synchronous rectifier, low-dropout regulator (LDO), digital control, charger controller, and accurate voltage and current loops in a single package.  The entire power stage (rectifier and LDO) uses low-resistance N-MOSFETs (100 mΩ typical R_DS(ON)) to ensure high efficiency and low power dissipation.