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http://dx.doi.org/10.7471/ikeee.2020.24.1.319

DCM DC-DC Converter for Mobile Devices  

Jung, Jiteck (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.24, no.1, 2020 , pp. 319-325 More about this Journal
Abstract
In this paper, a discontinuous-conduction mode (DCM) DC-DC buck converter is presented for mobile device applications. The buck converter consists of compensator for stable operations, pulse-width modulation (PWM) logic, and power switches. In order to achieve small hardware form-factor, the number of off-chip components should be kept to be minimum, which can be realized with simple and efficient frequency compensation and digital soft start-up circuits. Burst-mode operation is included for preventing the efficiency from degrading under very light load condition. The DCM DC-DC buck converter is fabricated with 0.18-um BCDMOS process. Programmable output with external resistors is typically set to be 1.8V for the input voltage between 2.8 and 5.0V. With a switching frequency of 1MHz, measured maximum efficiency is 92.6% for a load current of 100mA.
Keywords
DCM DC-DC converter; Mobile devices; Soft start-up; Burst-mode; PWM control;
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