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

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.