JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Fast Response Integrated Current-Sensing Circuit for Peak-Current-Mode Buck Regulator

  • Ha, Jung-Woo (College of Information & Communication Engineering, Sungkyunkwan University) ;
  • Park, Byeong-Ha (Samsung Electronics) ;
  • Kong, Bai-Sun (College of Information & Communication Engineering, Sungkyunkwan University) ;
  • Chun, Jung-Hoon (College of Information & Communication Engineering, Sungkyunkwan University)
  • Received : 2014.08.13
  • Accepted : 2014.11.04
  • Published : 2014.12.30
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Abstract

An on-chip current sensor with fast response time for the peak-current-mode buck regulator is proposed. The initial operating points of the peak current sensor are determined in advance by the valley current level, which is sensed by a valley current sensor. As a result, the proposed current sensor achieves a fast response time of less than 20 ns, and a sensing accuracy of over 90%. Applying the proposed current sensor, the peak-current-mode buck regulator for the mobile application is realized with an operating frequency of 2 MHz, an output voltage of 0.8 V, a maximum load current of 500 mA, and a peak efficiency of over 83%.

Keywords

References

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