MIMO Switched-Capacitor converter using only parasitic capacitance with Scalable Parasitic Charge Redistribution

Abstract

In this work a Multiple-Input Multiple-Output (MIMO) Switched-Capacitor (SC) converter is presented that generates Multiple DC voltages using only the parasitic capacitances already present in fully-integrated SC converters. In combination with the Scalable Parasitic Charge Redistribution technique, the presented MIMO converter can provide voltage rails for control blocks or clock generation in low-power SC converters, without any area overhead. The proposed converter only makes use of existing blocks and therefore only adds conductive losses, which means that for low output powers, efficiencies close to 100% can be achieved. A theoretical analysis of the converter is given and used to prove the efficiency of the converter compared to regular SC MIMO converters. The working principle of the proposed MIMO converter is verified with measurements, demonstrating a peak efficiency of 98.9%.