This talk will demonstrate an ultra-high frequency, 10MHz Buck converter with GaN HEMT for mobile phone applications. The goal is to explore the potential of GaN devices in ultra-high frequency Buck circuits. A 10MHz 10V to 1V Buck converter is built to show the performance of GaN HEMT, where the frequency is too high for Si devices to be adopted. Different types of inductors are designed and tested. For 10V to 1V conversion, at 10MHz and full load 2.5A, 84% of full load efficiency is achieved with peak efficiency 87%.
