JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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Ultra-fast Adaptive Frequency-controlled Hysteretic Buck Converter for Portable Devices

  • Kim, Kwang-Ho (Samsung Electronics) ;
  • Kong, Bai-Sun (College of Information and Communication Engineering, Sungkyunkwan University)
  • Received : 2016.01.21
  • Accepted : 2016.03.28
  • Published : 2016.10.30
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Abstract

The paper describes a hysteretic buck converter including a differentiator and an adaptive hysteresis window controller. Differentiating the feedback signal achieves ultra-fast switching of the buck converter. The adaptive hysteresis window control allows a monotonous operation with predictable noise spectrum, and gives way to efficient design for variable supply and output voltages. The measurement results in a $0.13-{\mu}m$ CMOS process indicated that the switching frequency became double times higher, and the voltage ripple was reduced by up to 69%. They also indicated that the normalized switching frequency variation was reduced by 74% with variable $V_{DD}$ and by 63% with variable $V_{OUT}$. The power efficiency was improved by 3.5% depending on loading condition.

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References

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