A true two-quadrant fully integrated switched capacitor DC-DC converter supporting vertically stacked DVS-loads with up to 99.6% efficiency

Abstract

This paper presents a Switched Capacitor DC-DC converter capable of powering two vertically stacked loads, unlocking efficiencies of up to 99.6% when loads consume identical current. Furthermore, this converter is the first to provide up to 100% current imbalance thanks to its true two-quadrant operation, allowing loads to completely turn off. The system has been fabricated in a 65nm GP process followed by validation through measurements of its high efficiencies (>90% when δI<0.4) and control loop operation.