A dual-mode single-inductor dual-output dc-dc converter with fast transient response

Abstract

A novel integrated single-inductor dual-output (SIDO) buck converter with peak current common-mode and the two output voltage ripples comparison differential-mode control method in continuous conduction mode is presented. The system can use only one inductor to provide two independent output voltages, 1.2V and 1.8V, with a maximum total output current 460mA. The proposed converter has been fabricated in a 0.18µm 1P6M CMOS process. Experimental results show the load transient response time is only 8µs and the cross-regulation is about 0.05mV/mA when the load current suddenly changes 200mA. The maximum power conversion efficiency 93.5% is achieved at total output power 240mW.