The bq5105x device is a high-efficiency, Qi-compliant wireless power receiver with an
integrated Li-Ion/Li-Pol battery charge controller for portable applications. The bq5105xB devices
provide efficient AC-DC power conversion, integrates the digital controller required to comply with
Qi v1.2 communication protocol, and provides all necessary control algorithms needed for efficient
and safe Li-Ion and Li-Pol battery charging. Together with the bq500212A transmitter-side
controller, the bq5105x 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 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 v1.2 communication protocol.
The bq5105xB 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) use low-resistance N-MOSFETs (100-mΩ
typical Rdson) to ensure high efficiency and low power dissipation.
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