High power-density, hybrid inductive/capacitive converter with area reuse for multi-domain DVS

This paper presents a fully integrated hybrid inductive/capacitive converter that supports 70X output power range while maintaining high efficiency. This high efficiency is achieved by using an inductive converter for larger loads and a capacitive converter for lower loads. We have also shown the feasibility of implementing digital circuits under the inductor increasing the peak converter power density from 0.387 W/sq-mm to 4.1 W/sq-mm with only a minor hit on the efficiency. The maximum measured efficiency decreases from 76.4% to 71% when the digital circuits under inductor are present. The design has been fabricated in IBM´s 32nm SOI technology.