New wireless charging transmitter solutions unveiled

11-10-2021 | Alpha and Omega Semiconductor | Power

Alpha and Omega Semiconductor Limited has launched a new family of Coil Drivers. The initial product, AOZ32033AQI, provides 30V, 11mOhm in a QFN3x3 package. It is an integrated half-bridge gate driver able to drive high-side and low-side N-channel MOSFETs. It features SRC to adjust sink/source current and provide the ideal trade-off between efficiency and EMI optimisation in the design of Wireless Charging Transmitter circuits. The device is ideal for designing Wireless Charging TX circuits employed in cordless power tools, drones, vacuum cleaners, and other consumers’ electronic equipment composed of full-bridge topology with a resonant tank circuit to produce the best power conversion efficiency.


With a highly integrated package, the solution provides a part count reduction of up to 40% compared to conventional approaches. The new device facilitates PCB space savings and higher performance in wireless transmitter circuits with high wattage of up to 30W. Furthermore, it has multiple protection functions, including high side and low side UVLO and OTP, to make the design more robust. The device can be utilised for a wide range of input voltages from 4V to 28V.


“Wireless charging is offered at increasingly higher power levels as the benefits of eliminating physical connectors and cables are being realised by more end applications. AOS’s Coil Driver products provide an efficient, power-dense, and cost-effective solution for wireless charging TX circuits. The integrated approach offers protection features not possible by using a discrete approach while reducing engineering design cycles and complexities,” said Colin Huang, Power IC marketing manager at AOS.

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