Session 26-5

A Fast-Transient DVS-Capable Switching Converter
with &DeltaI_L-Emulated Hysteretic Control

 

Abstract

A &DeltaIL-emulated hysteretic switching converter, achieving both low-ESR operation and fast load transient response, is presented. Designed with a 0.35μm CMOS process, it achieves sub-10mV output ripple and 7.6μs/14.4μs response times to 400mA load step-up/down changes. Reference tracking speed in DVS is less than 20μs/V, which is 9.4 times faster on down-tracking than conventional counterparts, due to a charge recycling technique. It achieves a maximum efficiency of 92.7% and a fixed frequency that is adaptively controlled at 1.7MHz.