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http://dx.doi.org/10.5762/KAIS.2011.12.6.2747

Design of a PWM DC-DC Boost Converter IC for Mobile Phone Flash  

Jung, Jin-Woo (Korea Electrotechnology Research Institute)
Heo, Yun-Seok (Department of Nano Systems Engineering, Center for Nano Manufacturing)
Park, Yong-Su (School of Electronics, Chung Cheong University)
Kim, Nam-Tae (Department of Electronic Engineering, Inje University)
Song, Han-Jung (Department of Nano Systems Engineering, Center for Nano Manufacturing)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.12, no.6, 2011 , pp. 2747-2753 More about this Journal
Abstract
In this paper, a PWM current-mode DC-DC boost converter for mobile phone flash application has been proposed. The converter which is operated with 5 Mhz high switching frequency is capable of reducing mounting area of passive devices such as inductor and capacitor, consequently is suitable for compact mobile phones. This boost converter consists of a power stage and a control block. Circuit elements of the power stage are inductor, output capacitor, MOS transistors and feedback resistors. Meanwhile, the control block consists of pulse width modulator, error amplifier, oscillator etc. Proposed boost converter has been designed and verified in a $0.5\;{\mu}m$ 1-poly 2-metal CMOS process technology. Simulation results show that the output voltage is 4.26 V in 3.7 V input voltage, output current 100 mA which is larger than 25 ~ 50 mA in conventional 500 Khz driven converter when the duty ratio is 0.15.
Keywords
Portable device; Current mode; PWM; DC-DC boost converter; CMOS; Switching regulator;
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