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http://dx.doi.org/10.5573/JSTS.2014.14.6.810

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)
Publication Information
JSTS:Journal of Semiconductor Technology and Science / v.14, no.6, 2014 , pp. 810-817 More about this Journal
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
Current-mode buck regulator; on-chip current-sensing circuit; fast response current sensor;
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