The bq5101xB is a family of advanced, flexible, secondary-side devices for wireless power transfer in portable applications. The bq5101xB devices provide the AC/DC power conversion and regulation while integrating the digital control required to comply with the Qi v1.1 communication protocol. Together with the bq50xxx primary side controller, the bq5101xB enables a complete contact-less power transfer system for a wireless power supply solution. Global feedback is established from the secondary to the primary in order to control the power transfer process utilizing the Qi v1.1 protocol.