A time-domain-control-based quasi- V2 buck converter with small area, fast transient response, wide load current range, and constant switching frequency is proposed in this paper. The proposed time-domain-based controller achieves compact core area and simplified constant switching frequency control by replacing the conventional voltage-domain comparator with a phase detector having an adaptive detection window. Moreover, a coupling-based inductor current emulator is also proposed to support the discontinuous conduction mode operation in the light load. The proposed buck converter is implemented using 0.35- μm CMOS process. The core area of the proposed buck converter is only 0.293 mm2. The measured peak efficiency in the continuous conduction mode is 92% and the end-to-end efficiency in the load current range of 25-700 mA is 73%. The undershoot/overshoot and recovery time with the up/down load current steps of 510 mA are 38/20 mV and 2.5/2.6 μs , respectively.
Bibliographical noteFunding Information:
Manuscript received September 3, 2017; revised November 12, 2017 and January 5, 2018; accepted January 31, 2018. Date of publication April 9, 2018; date of current version May 24, 2018. This paper was approved by Associate Editor Piero Malcovati. This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education under Grant NRF-2014R1A1A2055640. (Corresponding author: Seong-Ook Jung.) D.-H. Jung was with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea. He is now with Samsung Electronics Co., Ltd, Yongin 446-711, South Korea.
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering