Abstract
This paper presents a DC–DC step-down converter, which can accommodate the range of power supply voltage from VDD to sub-2×VDD. By utilizing stacked power MOSFETs, a voltage level converter, a detector and a controller, the proposed design is realized by a typical 1P6M 0.18μm CMOS process without using any high voltage process to resolve gate-oxide reliability and leakage current problems. The core area of the proposed design is less than 0.184mm2, while the power supply range is up to 5V. Since the internal reference voltage is 1.0V, it can increase the output regulation range. The proposed design attains very high conversion efficiency to prolong the life time of battery-based power supply. Therefore, it can be integrated in a SOC (system-on-chip) to provide multiple supply voltage sources.
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