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http://dx.doi.org/10.5762/KAIS.2014.15.3.1700

Design of a DC-DC Step-Down Converter for LED Backlight of Mobile Devices  

Son, Hyun-Sik (Department of Nanoscience and Engineering, Inje University)
Lee, Min-Ji (Department of Nanoscience and Engineering, Inje University)
Park, Won-Kyoung (Department of Nanoscience and Engineering, Inje University)
Song, Han-Jung (Department of Nanoscience and Engineering, Inje University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.3, 2014 , pp. 1700-1706 More about this Journal
Abstract
In this paper, a step down converter for LED backlight of mobile application has been proposed. The converter which is operated with 4 MHz high switching frequency is capable of reducing mounting area of passive devices consists of a power stage and a control block. Circuit elements of the power stage are inductor, output capacitor, MOS transistors and feedback resistors. The control block consists of pulse width modulator, error amplifier and oscillator etc. Proposed step down converter has been designed and verified using a $0.35{\mu}m$ 1-poly 4-metal BCD process technology. Simulation results show that the output voltage is 1.8 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 0.4.
Keywords
BCD process; Integrated circuit; LED backlight; Step-Down DC-DC converter;
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