A 464-nA Quiescent Current Buck Converter With 93.7% Peak Efficiency for IoT Devices
Tian Guo, Quanzhen Duan, Minseok Lee, Jeongjin Roh
Abstract
This article presents a low-quiescent current, high-efficiency buck converter. A dynamic pulse frequency modulation control with adaptive <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> -time was proposed to increase efficiency. An ultra-low power system can be achieved with minimized quiescent current in each block and a low-power bandgap reference. The entire proposed buck converter consumed a quiescent current of 464 nA with a peak efficiency of 93.7 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$%$</tex-math></inline-formula> over the load range from 0 to 50 mA. In addition, a maximum converter output ripple of only 28 mV was achieved at this ultra-low quiescent current.