New Half-Bridge Coil Driver with Slew-Rate Control and Integrated Bootstrap Diode for Wireless Charger Transmitter

1 October 2021 - 0 Comments

Alpha and Omega Semiconductor Limited has announced a new family of Coil Drivers with the initial product “AOZ32033AQI” which is an integrated half-bridge gate driver capable of driving high-side and low-side N-channel MOSFETs. It offers 30V, 11mOhm in a QFN3x3 package and is ideally suited to the design of Wireless Charging TX circuits used in cordless power tools, vacuum cleaners, drones, and other consumers’ electronic equipment composed of full-bridge topology with a resonant tank circuit to get the best power conversion efficiency. This Device 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 AOZ32033AQI half-bridge gate driver enables PCB space savings and higher performance in wireless transmitter circuits with high wattage of up to 30W and offers a part count reduction of up to 40% compared to traditional approaches. With a highly integrated package, this device can be used for a wide range of input voltages from 4V to 28V. Moreover, it has multiple protection functions such as high side and low side UVLO and over-temperature protection (OTP) to make the design more robust.