Optimization of charge pump based on piecewise modeling of output‐voltage ripple

Abstract

This work proposes a piecewise modeling of output‐voltage ripple for linear charge pumps. The proposed modeling can obtain a more accurate design expression of power‐conversion efficiency. The relationship between flying and output capacitance, as well as switching frequency and optimize power‐conversion efficiency can be calculated. The proposed modeling is applied to three charge‐pump circuits: 1‐stage linear charge pump, dual‐branch 1‐stage linear charge pump and 4× cross‐coupled charge pump. Circuit‐level simulation is used to verify the accuracy of proposed modeling.