휴대용 시스템을 위한 고효율 PWM DC-DC Buck 변환기

In this paper, we describe a current-mode DC-DC buck converter which operates in the input voltage range of 2.5~3.5V and load current up to 800㎃. It has been designed using a 0.35㎛ CMOS technology. The DC-DC converter design has been focused on minimizing the current consumption of the control circuits and a zero current sensing circuit is employed to improve the converter efficiency at light load condition. The converter designed using a 0.35㎛ CMOS technology exhibits a maximum power efficiency of 97.6% and output voltage ripple less than 2㎷. Its chip size is 1.53㎜×1.2㎜ including PAD.