A 200-mA, 93% peak power efficiency, single-inductor, dual-output DC---DC buck converter

Authors:
Edoardo Bonizzoni;Fausto Borghetti;Piero Malcovati;Franco Maloberti
Affiliations:
Department of Electronics, University of Pavia, Pavia, Italy 27100;Department of Electronics, University of Pavia, Pavia, Italy 27100 and Fondazione Bruno Kessler (FBK-irst), Trento, Italy 38100;Department of Electrical Engineering, University of Pavia, Pavia, Italy 27100;Department of Electronics, University of Pavia, Pavia, Italy 27100
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2010

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Abstract

A single-inductor dual-output (SIDO) DC---DC buck converter is presented. The circuit uses only one (external) inductor to provide two independent output voltages ranging from 1.2 V to the power supply (2.6---5 V) with a maximum total output current of 200 mA. The proposed converter has been fabricated in a 0.35-μm p-substrate CMOS technology. Measurement results demonstrate that a peak power efficiency as high as 93.3% can be achieved. An automatic substrate bias switch technique, that cancels the body effect of the p-channel output power transistors, improves the converter power efficiency performance.