MIMO Switched-Capacitor DC–DC Converters Using Only Parasitic Capacitances Through Scalable Parasitic Charge Redistribution

This paper presents a multiple-input multiple-output (MIMO) switched-capacitor (SC) dc-dc converter that only uses the parasitic capacitance already present in fully integrated SC power converters to generate multiple dc voltages. When used in an SC converter together with the scalable parasitic charge redistribution technique, the presented MIMO converter provides additional voltage rails, which can be used to power gate drivers or control blocks without any area overhead. Moreover, because the proposed converter only makes use of elements, which are already present in fully integrated SC converters, only conductive losses are introduced. This means that, for low output powers, efficiencies arbitrarily close to 100% can be achieved. The presented type of converter is characterized using an MIMO model, which is, in turn, used to prove the efficiency of the converter compared with regular SC MIMO converters, particularly for a large number of inputs or outputs. Measurements verify the basic working principle of the presented converter, demonstrating a peak efficiency of 98.9% and output powers sufficient to power internal converter blocks.