A High Efficiency Current-Mode DC-DC Step-Down Converter with Wide Range of Output Current

Abstract

This paper presents a high efficiency current-mode DC-DC step-down converter with wide range of output current. The converter adaptively operates as Pulse-Width Modulation (PWM). An on-chip current sensing technique is employed to reduce external components and no extra I/O pins are needed for the current-mode controller. A soft-start operation is designed to eliminate the excess large current during the startup of the regulator. The circuit has been designed with TSMC 2P4M 0.35 mu m CMOS process. The range of the supply voltage is from 2 to 5V, which is suitable for single-cell lithium-ion battery.