The BQ501210 from Texas Instruments is a WPC V1.2 compatible wireless power transmitter that integrates the logic functions required to wirelessly transfer power to a WPC-compatible receiver with the capability of delivering up to 15 W. It is an intelligent device that periodically pings the surrounding environment for available devices to be powered, detects if a foreign metal object is present on the charging pad, monitors all communication from the device being wirelessly powered, and adjusts power applied to the transmitter coil as per feedback received from the powered device.
This transmitter uses a rail voltage control scheme instead of the traditional frequency control to adjust the amount of power delivered to the receiver. It supports fast charge operation with compatible receivers and has low standby power when Idle or when charging is complete. This Bi-directional cummunicating transmitter has 10 configurable LED modes to indicate the charging state and fault state. It also manages the fault conditions associated with the power transfer and controls the operating mode status indicator. This device is ideal for smart phones, tablets and custom wireless power applications.