Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Integrated Current-Mode DC-DC Buck Converter with Low-Power Control Circuit

  • Jeong, Hye-Im (School of Electrical and Computer Engineering, Chungbuk National University) ;
  • Lee, Chan-Soo (School of Electrical and Computer Engineering, Chungbuk National University) ;
  • Kim, Nam-Soo (School of Electrical and Computer Engineering, Chungbuk National University)
  • Received : 2013.05.09
  • Accepted : 2013.07.26
  • Published : 2013.10.25
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Abstract

A low power CMOS control circuit is applied in an integrated DC-DC buck converter. The integrated converter is composed of a feedback control circuit and power block with 0.35 ${\mu}m$ CMOS process. A current-sensing circuit is integrated with the sense-FET method in the control circuit. In the current-sensing circuit, a current-mirror is used for a voltage follower in order to reduce power consumption with a smaller chip-size. The N-channel MOS acts as a switching device in the current-sensing circuit where the sensing FET is in parallel with the power MOSFET. The amplifier and comparator are designed to obtain a high gain and a fast transient time. The converter offers well-controlled output and accurately sensed inductor current. Simulation work shows that the current-sensing circuit is operated with an accuracy of higher than 90% and the transient time of the error amplifier is controlled within $75{\mu}sec$. The sensing current is in the range of a few hundred ${\mu}A$ at a frequency of 0.6~2 MHz and an input voltage of 3~5 V. The output voltage is obtained as expected with the ripple ratio within 1%.

Keywords

References

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