Design of maximum-efficiency integrated voltage doubler

In this paper, an algorithm and the analytical expressions to be used for the design of maximum-efficiency integrated charge pumps based on the voltage doubler architecture are presented. Starting from basic considerations on charge transfer, the proposed methodology allows adequate choice of the stage number and of the size of all charge pump elements, namely, capacitors, transfer switches, and phase drivers. The whole design flow ensures the target output voltage and output current values to be achieved taking the parasitic elements (capacitances and switch on-resistances) into account. The proposed design strategy was implemented in C#(R) environment, thus allowing an automated CP design.