Texas Instruments bq50002 wireless power transmitter analog front end

The bq50002 is a highly integrated wireless power transmitter analog front end that contains all of the analog components required to implement a WPC-compliant 5 V transmitter. It integrates a full-bridge power driver with MOSFETs, a variable-frequency oscillator, a two-channel communication demodulator, a linear regulator and protection circuits.

The product must be used together with the digital controller bq500511 to realise a compact two-chip wireless power transmitter. The bq500511 safely engages the RX device, receives packet communication from the powered device and manages the power transfer according to WPC v1.2 specification.

The system supports foreign object detection (FOD) by continuously monitoring the amount of power transferred and comparing that to the amount of received power, as reported by the receiver. This protects against power loss to metal objects misplaced in the wireless power transfer field. In order to do this, the bq50002 measures the input DC current using a current sense amplifier. Should any abnormal condition develop during power transfer, the bq500511 handles it and provides indication outputs.