Half bridge power stage offers power density for wireless charging
Packaged in a thermally enhanced QFN 4 x 4 package, the AOZ32034AQV is the latest product in the family of coil drivers for wireless charging transmitter circuits of up to 50W. It has been designed by Alpha and Omega Semiconductor (AOS) for wireless charging applications in charging stations, cordless power tools, vacuum cleaners, drones and other consumer electronic equipment.
At 50W, the AOZ32034AQV offers a higher power rating compared to the earlier device in this family, the AOZ32033AQI, which is suited to 30W applications. Wireless charging circuits use a full-bridge topology with a resonant tank circuit to get the best power conversion efficiency and the AOZ32034AQV half-bridge power stage simplifies the implementation of this topology over discrete approaches, said AOS. It has the ability to adjust MOSFET gate drive using the slew rate control (SRC) pin which allows a system designer to optimise the design by making trade-offs between EMI and efficiency. The input voltage range is from 4V to 28V.
In addition to reducing the complexity of wireless charging implementations, especially in applications sensitive to EMI, said Armin Hsu, power IC marketing manager at AOS, the AOZ32034AQV half-bridge power stage for coil drivers reduces these complexities and the footprint.
In addition it has low RDS(on) internal N-FETs for both HS/LS (high side / low side) and supports TX circuit designs of up to 50W. There is in-built protection with over-temperature protection, VCC under-voltage lockout and bootstrap under-voltage lockout.
The QFN4x4 package is thermally enhanced, said AOS.
The AOZ32034AQV is immediately available in production quantities with a lead-time of 24 weeks.
Alpha and Omega Semiconductor, or AOS, is a designer, developer and supplier of a broad range of power semiconductors, including a wide portfolio of power MOSFET, IGBTs, IPMs, TVS, HVICs, SiC / GaN, Power ICs and digital power products. AOS has developed extensive intellectual property and technical knowledge to introduce innovative products addressing the increasingly complex power requirements of advanced electronics. AOS differentiates itself by integrating its discrete and IC semiconductor process technology, product design, and advanced packaging know-how to develop high-performance power management solutions. AOS’s portfolio of products targets high-volume applications, including portable computers, flat-panel TVs, LED lighting, smartphones, battery packs, consumer and industrial motor controls, automotive electronics, and power supplies for TVs, computers, servers, and telecommunications equipment.
