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This paper presents the first monolithically integrated two-phase series capacitor buck converter. This converter achieves over 60 A/cm3 current density. The series capacitor buck converter topology enables high frequency (HF) operation up to 5 MHz per phase without special magnetics or compound semiconductors. An adaptive constant on-time controller provides fast load transient response and fixed...
This study examines the mechanism and effectiveness of current sharing in a multiphase, series capacitor buck converter. The automatic current sharing mechanism is inherent to the series capacitor buck topology and uniquely utilizes its series capacitor. Unlike conventional multiphase buck converters, current sharing is achieved without any current sensing circuits or added external control loops...
This paper introduces a technique to improve light load efficiency in a two-phase, series capacitor buck converter. A unique aspect of the series capacitor buck topology is that if conventional, even phase interleaving is used in discontinuous current mode (DCM), negative inductor current can be generated in one of the phases. The negative current increases power loss and creates an unwanted offset...
This paper presents a theoretical and experimental comparison of a two-phase buck converter and a two-phase, series capacitor buck converter. The challenges of a conventional buck converter in high current (10 A or more), high frequency (3–30 MHz) point-of-load voltage regulators with large voltage conversion ratios (10-to-1) are discussed. The series capacitor buck converter exhibits characteristics...
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