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http://dx.doi.org/10.5762/KAIS.2016.17.6.715

Design of a step-up DC-DC Converter using a 0.18 um CMOS Process  

Lee, Ja-kyeong (Department of Nano Engineering, Inje University/Department of Nanoscience and Engineering, Center for Nano Manufacturing, Inje University)
Song, Han-Jung (Department of Nano Engineering, Inje University/Department of Nanoscience and Engineering, Center for Nano Manufacturing, Inje University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.17, no.6, 2016 , pp. 715-720 More about this Journal
Abstract
This paper proposes a PWM (Pulse Width Modulation) voltage mode DC-DC step-up converter for portable devices. The converter, which is operated with a 1 MHz switching frequency, is capable of reducing the mounting area of passive devices, such as inductor and capacitor, and is suitable for compact mobile products. This step-up converter consists of a power stage and a control block. The circuit elements of the power stage are an inductor, output capacitor, MOS transistors Meanwhile, control block consist of OPAMP (operational amplifier), BGR (band gap reference), soft-start, hysteresis comparator, and non-overlap driver and some protection circuits (OVP, TSD, UVLO). The hysteresis comparator and non-overlapping drivers reduce the output ripple and the effects of noise to improve safety. The proposed step-up converter was designed and verified in Magnachip/Hynix 0.18um 1-poly, 6-metal CMOS process technology. The output voltage was 5 V with a 3.3 V input voltage, output current of 100 mA, output ripple less than 1% of the output voltage, and a switching frequency of 1 MHz. These designed DC-DC step-up converters could be applied to the Personal Digital Assistants(PDA), cellular Phones, Laptop Computer, etc.
Keywords
CMOS DC-DC step-up converter; PMIC; Portable devices; PWM; On chip; Voltage mode;
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