A High-Efficient Current-Mode PWM DC-DC Buck Converter Using Dynamic Frequency Scaling

Abstract

Improving efficiency of power management solutions for battery-operated devices is an important issue. This paper presents design and implementation of a novel high-efficiency current-mode pulse width modulated (PWM) buck converter with dynamic frequency scaling. This circuit is capable of ensuring high efficiency under different load conditions, by dynamically changing the frequency of operation with respect to the load current with the help of a novel frequency decision circuit. In addition, soft start operation protects the circuit from large in-rush current during start up of the converter. The proposed circuit is implemented in TSMC 16nm FinFET CMOS technology. Simulation outcome has shown an output voltage of 0.8V, when the input voltage is ranging from 2.3 to 3.6V, with a maximum conversion efficiency of 92.25% (heavy loads) and 92.11% (light loads), making this circuit quite useful in power management ICs.