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http://dx.doi.org/10.7471/ikeee.2018.22.1.174

DC-DC Converter for Low-Power Power Management IC  

Jeon, Hyeondeok (School of Electrical and Computer Engineering, University of Seoul)
Yun, Beomsu (School of Electrical and Computer Engineering, University of Seoul)
Choi, Joongho (School of Electrical and Computer Engineering, University of Seoul)
Publication Information
Journal of IKEEE / v.22, no.1, 2018 , pp. 174-179 More about this Journal
Abstract
In this paper, design of high-efficiency DC-DC converter is presented for low-power PMIC (power management integrated circuit). As PMIC technologies for IoT and wearable devices have been continuously improved, high-efficiency energy harvesting schemes should be essential. Since the supply voltage resulting from energy harvesting is low and widely variable, design techniques to achieve high efficiency over a wide input voltage range are required. To obtain a constant switching frequency for wide input voltage range, frequency compensation circuit using supply-voltage variation sensing circuit is included. In order to obtain high efficiency performance at very low-power condition, accurate burst-mode control circuit was adopted to control switching operations. In the proposed DC-DC buck converter, output voltage is set to be 0.9V at the input voltage of 0.95~3.3V and maximum measured efficiency is up to 78% for the load current of 180uA.
Keywords
DC-DC Converter; Buck Converter; Energy Harvesting; Burst-mode; Low Power; High Efficiency;
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