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http://dx.doi.org/10.7471/ikeee.2019.23.3.1061

Design of Highly Integrated 3-Channel DC-DC Converter Using PTWS for Wearable AMOLED  

Jeon, Seung-Ki (School of Electrical and Computer Engineering, Chungbuk National University)
Lee, Hui-Jin (School of Electrical and Computer Engineering, Chungbuk National University)
Choi, Ho-Yong (School of Electrical and Computer Engineering, Chungbuk National University)
Publication Information
Journal of IKEEE / v.23, no.3, 2019 , pp. 1061-1067 More about this Journal
Abstract
In this paper, a highly integrated 3-channel DC-DC converter is designed using power transistor width scaling (PTWS). For positive voltage, $V_{POS}$, a boost converter is designed using the set-time variable pulse width modultaion (SPWM) dual-mode and PTWS to improve efficiency at light load. For negative voltage, $V_{NEG}$, a 0.5 x regulated inverting charge pump is designed with pulse skipping modulation (PSM) controller to reduce power consumption, and for an additional positive voltage, $V_{AVDD}$, a LDO circuit is designed. The proposed DC-DC converter has been designed using a $0.18{\mu}m$ BCDMOS process. Simulation results show that the proposed converter has power efficiency of 56%~90% for load current range of 1 mA~70 mA and output ripple voltage less than 5 mV at positive voltage.
Keywords
PTWS; SPWM; DC-DC converter; AMOLED display; charge pump; boost; LDO;
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