JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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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)
  • Received : 2015.04.07
  • Accepted : 2015.07.25
  • Published : 2015.08.30
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Abstract

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%.

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References

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