Highly efficient step-down/step-up and step-up/step-down charge pump

摘要

A charge pumping system capable of a forward operation mode and a reverse operation mode is provided. In forward operation mode the charge pumping system can step-up an input voltage at a ratio of :1 and can step-down the input voltage at a ratio of at east one of 1:1, 3:2, 2:1 and 3:1. In reverse operation mode the charge pumping system can step-down the input voltage at a ratio of 1:and 1:1 and can step-up the input voltage at a ratio of at least one of 2:3, 1:2 and 1:3.