33.4 An 8A 998A/inch3 90.2% Peak Efficiency 48V-to-1V DC-DC Converter Adopting On-Chip Switch and GaN Hybrid Power Conversion
Xu Yang, Haixiao Cao, Chenkang Xue, Lenian He, Zhichao Tan, Menglian Zhao, Yong Ding, Wuhua Li, Wanyuan Qu
Abstract
With the advances in artificial intelligence, devices are becoming more intelligent and power hungry. The 48V-to-1V converter, which offers a promising solution to the high-power density data center and automotive applications, is quickly gaining the interest of researchers [1 -4]. The prior state-of-the arts, however, mainly employ Gallium Nitride (GaN) or other discrete switches for 48V-to-1V design, which increases costs and hurts power density. In this work, a 12-level series-capacitor converter adopting on-chip switch and GaN hybrid power conversion is proposed. By exploiting the benefits of low-voltage on-chip transistors, this work reduces component count, increases switching frequency and improves power density.