Half-bridge driver for 30W wireless charging transmitters

September 30, 2021 // By Nick Flaherty
Half-bridge driver for 30W wireless charging transmitters
The AOZ32033AQI 30W half-bridge coil driver is packages in a thermally enhanced 3 x 3mm QFN

Alpha and Omega Semiconductor (AOS) has launched a family of coil drivers for wireless charging. 

The AOZ32033AQI is a 30V, 11mOhm half-bridge gate drive coil driver in a QFN3x3 package that is

capable of driving high-side and low-side N-channel MOSFETs. It features SRC (Slew Rate Control) to adjust sink/source current and provide the ideal trade-off between efficiency and EMI optimization in the design of wireless charging transmitter (TX) circuits.

The device is aimed at cordless power tools, vacuum cleaners, drones, and other consumer electronic equipment composed of full-bridge topology with a resonant tank circuit to get the best power conversion efficiency up to 30W.

The integrated package means the AOZ32033AQI reduces part count by up to 40 percent compared to traditional approaches. The device has multiple protection functions such as high side and low side UVLO and over-temperature protection (OTP) to make the design more robust with 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 realized 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.

The AOZ32033AQI is immediately available in production quantities at $0.75 with a lead-time of 12 weeks.

www.aosmd.com

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