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This paper proposes a switched-capacitor voltage buck converter (SC-VBC) with variable step-down controller (VSC) and switching frequency controller (SFC). The VSC and SFC change the step-down ratio and switching frequency of the SC-VBC in accordance with the input voltage and load current, respectively, enabling the converter to operate efficiently with a wide-ranging input voltage and load current. Measurements of a prototype chip demonstrated that our SC-VBC achieved a wide input voltage range and high efficiency of 1.3 – 2.6 V and 69%, respectively.

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