Abstract
In this paper, a high‐efficiency solution to multi‐phase charge pump with full‐coverage integer voltage conversion ratios (VCRs) ranges from 1 to 2n is proposed. To improve the systematic efficiency of multi‐phase charge pump, the critical aspect of non‐overlapping (NON) time is designed. To precisely set the NON time of multi‐phase clock signals, counter‐based solution is proposed. The solution makes NON time to be evenly inserted into every clock phase and achieves equal charging period. In addition, an efficiency enhancement scheme is used by turning off some unnecessary converter stages to improve the efficiency at some particular VCRs. Based on 0.25 µm process, this proposed control strategy is conducted in a multi‐phase power converter. And its peak efficiency and current drivability can reach 96% and 6 mA, respectively.
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