Abstract
A high efficiency 1/2X switched capacitor (SC) DC-DC converter capable of providing high load current up to 10 A is presented in this paper. To maintain high efficiency over the wide load range, adaptive switching frequency is adopted. By modeling the output impedance and power loss of the SC converter, the influence of switching frequency on efficiency is quantified to find the optimal switching frequency at each load. Linear frequency modulation is built since the optimal switching frequency is proved to be proportional to the load. Subtractor with high bandwidth and automatic frequency modulation module are proposed to ensure the converter work at the optimal frequency under each load. Using 0.18μm BCD process, simulation results show the proposed SC converter can quickly adjust the switching frequency during load transients. Over 86% efficiency is achieved over the entire load range from 5 mA to 10 A and peak efficiency is higher than 98%. Meanwhile, the output voltage ripple is guaranteed less than 40 mV.
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