Highly-integrated wireless power transmitter AFE

This post is sponsored by Texas Instruments. The bq50002 is a highly-integrated wireless power transmitter analog front end (AFE) from Texas Instruments (TI). The device contains all of the analog components required to implement a WPC compliant 5V transmitter. The bq50002 integrates a full-bridge power driver with MOSFETs, variable-frequency oscillator, two-channel communication demodulator, linear regulator, and protection circuits. bq50002 must be used together with the digital controller bq500511 to realize a compact two chip wireless power transmitter solution. 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 very accurately using a current sense amplifier. Should any abnormal condition develop during power transfer, the bq500511 handles it and provides indication outputs. Comprehensive status and fault monitoring features enable a low cost yet robust WPC-certified wireless power system design, says the company. The bq50002 is available in a thermally enhanced 5mm × 5mm, 32-pin QFN package.