Coil Drivers for Wireless Charging Transmitter Circuits up to 50W

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Coil Drivers for Wireless Charging Transmitter Circuits up to 50W


 Alpha and Omega Semiconductor Limited (AOS) released AOZ32034AQV, a new product in the family of coil drivers for wireless charging transmitter circuits of up to 50W. Packaged in a thermally enhanced QFN 4 x 4 package, the device is designed for wireless charging applications in charging stations, cordless power tools, vacuum cleaners, drones, and other consumer electronic equipment.

The AOZ32034AQV offers a higher power rating of up to 50W compared to the previous device in this family, the AOZ32033AQI, that was suited for 30W applications. Wireless charging circuits use a full-bridge topology with a resonant tank circuit to get the best power conversion efficiency. The AOZ32034AQV half-bridge power stage simplifies the implementation of this topology over discrete approaches. A key feature of this product family is the ability to adjust MOSFET gate drive using the slew rate control (SRC) pin. This allows a system designer to optimize the design by making trade-offs between EMI and efficiency. The device can be used for a wide range of input voltages from 4V to 28V.

“Wireless charging offers convenience in many applications. Implementations, especially in applications sensitive to EMI, can be complex. AOS’s new half-bridge power stage for coil drivers reduces these complexities while reducing solution footprint,” said Armin Hsu, Power IC Marketing Manager at AOS.

Technical Highlights

  • Integrated Half-Bridge Power Stage and bootstrap diode with wide input voltage (4V to 28V) range enables reduced PCB size
  • Low RDS(ON) internal N-FETs for both HS/LS supports TX circuit designs of up to 50W
  • Adjustable MOSFET gate slew rate control (SRC) for an optimal trade-off between EMI and efficiency
  • Robust and Reliable with built-in protection: OTP, VCC UVLO, Bootstrap UVLO
  • Thermally enhanced QFN4x4 package

Coil Driver Family Product List

Part Number Vin max. Integrated MOSFET Wireless Charging Transmitter (TX) Capability Package
AOZ32033AQI 28V 11mohm Up to 30W 18-Pin, QFN3x3
AOZ32034AQV 28V 7.5mohm Up to 50W 23-Pin, QFN4x4

Pricing and Availability

The AOZ32034AQV is immediately available in production quantities with a lead-time of 24 weeks. The unit price in 1,000pc quantities is $1.0 for AOZ32034AQV.


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