Parasitic capacitance effect on the performance of two-phase switchedcapacitor DC-DC converters

Abstract

The effects of parasitic capacitances on the performances of three common switched-capacitor DC-DC converters operating in the complete charge transfer case were studied with matrix calculation. The study was conducted by describing the top- and bottom-plate parasitic capacitances of a capacitor network in matrix form; these resulted matrices were then employed in some existing solutions so that not only the steady-state performance, but also the dynamic-state performance of a two-phase switched-capacitor DC-DC converter could be evaluated. The proposed method was validated with SPICE simulation and was used to study the final output voltage, start-up time and start-up energy consumption of an exponential, a Fibonacci and a linear converter under different parasitic capacitance effects.