Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 46, Issue 7, Pages 1715-1727Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2011.2144350
Keywords
Capacitive DC-DC converter; CMOS; monolithic; single boundary-multiphase control
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Monolithic integration in CMOS has boosted the development of low cost, compact and portable consumer applications. But until now the monolithic integration of DC-DC converters is still omitted in commercial applications. Primarily due to the need for high-efficiency converters and appropriate techniques to control high-frequency capacitive DC-DC converters. This paper presents a fully integrated capacitive step-down DC-DC converter in 90 nm CMOS with an ouput power capability of 150mW, a peak efficiency of 77% and a full load efficiency of 74%. The DC-DC converter is controlled by a Single Boundary-Multiphase Control (SB-MC). This control method provides a low power solution for controlling multiphase capacitive DC-DC converters without compromising the control loop bandwidth. This paper describes the design, implementation and measurements of the DC-DC converter.
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