JSTS:Journal of Semiconductor Technology and Science

  • 제15권4호
  • /
  • Pages.471-476
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  • 2015
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  • 1598-1657(pISSN)
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  • 2233-4866(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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A CMOS Hysteretic DC-DC Buck Converter with a Constant Switching Frequency

  • Jeong, Taejin (Department of Electronics Engineering, Inha University) ;
  • Yoon, Kwang S. (Department of Electronics Engineering, Inha University)
  • 투고 : 2015.04.07
  • 심사 : 2015.07.25
  • 발행 : 2015.08.30
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초록

This paper describes a CMOS hysteretic DC-DC buck converter with a constant switching frequency for mobile applications. The inherent problems of a large output ripple voltage that the conventional hysteretic DC-DC buck converters has faced have been resolved by using the proposed DC-DC buck converter which employed a ramp generator circuit to be able to increase a switching frequency. The proposed architecture enables the settling response time of charge pump circuit within the converter to become less than 6us suitable for mobile applications. The proposed DC-DC buck converter was implemented by using 0.35 um BCDMOS process and die size was $1.37mm{\times}1.37mm$. The measurement results showed that the proposed circuit received the input of 3.7 V and generated output of 1.2 V with the output ripple voltages less than 20 mV under load currents of 100~400 mA at the fixed switching frequency of 2 MHz. The maximum efficiency of the proposed hysteretic buck converter was measured to be around 93%.

키워드

참고문헌

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