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A Sensing Scheme Utilizing Current-Mode Comparison for On-Chip DC-DC Converter  

Kim, Hyung-Il (Department of Electrical Engineering, Kookmin University)
Song, Ha-Sun (Department of Electrical Engineering, Kookmin University)
Kim, Bum-Soo (Department of Electrical Engineering, Kookmin University)
Kim, Dae-Jeong (Department of Electrical Engineering, Kookmin University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.44, no.4, 2007 , pp. 86-90 More about this Journal
Abstract
An efficient sensing scheme applicable to DC-DC converters is proposed. The output voltage of the DC-DC converter is fed back and converted to a current signal at the input terminal of the sensor to decide if it is in the tolerable range. The comparison is accomplished by a current push-pull action. With the embedded reference current in the sensor realized from the reference voltage. The advantages of the scheme lie in the fairly accurate and efficient implementation in terms of power consumption and chip size overhead compared with conventional voltage-mode schemes as the major parameter in converting voltage to current is determined by (W/L) aspect ratio of the core transistors. In this paper, a DC-DC converter of 5V output from battery range of 2.2V${\sim}$3.6V adopting the proposed sensing scheme is implemented in a 0.35um CMOS process to prove the validity of the scheme.
Keywords
current-mode comparison; DC-DC converter;
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