As 3.6 x 2.9 x 0.5 mm, single-chip, 5 W receivers supporting WPC Qi 1.1 standard, bq51020 and bq51021 achieve up to 96% power efficiency and allow charging of Qi-compliant mobile phones, tablets, power banks, and other portable electronics. Programmable output voltage up to 8 V and low on-resistance MOSFETs reduce power loss. I²C interface, included with bq51021, lets designers implement foreign object detection, and pad-detect feature that facilitates alignment of receiver with charger.
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