Title :
A single-inductor dual-output switching converter with low ripples and improved cross regulation
Author :
Xu, Weiwei ; Li, Ye ; Gong, Xiaohan ; Hong, Zhiliang ; Killat, Dirk
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
This paper proposes a novel fly capacitor method for single-inductor dual-output (SIDO) switching converters to reduce the output ripples and spikes. An adaptive common-mode control is presented to suppress the cross regulation problem. The converter can automatically switch between pulse-width modulation (PWM) and pulse-frequency modulation (PFM) control to improve the efficiency. The SIDO converter is specified for one channel 1.2 V/400 mA and the other 1.8 V/200 mA with input voltage ranging from 2.7 V to 5 V. The chip has been fabricated on a 0.25 mum CMOS mixed signal process. The conversion efficiency is 82% at a total output power of 840 mW while the output ripples are about 20 mV and spikes less than 40 mV.
Keywords :
pulse frequency modulation; pulse width modulation; switching convertors; conversion efficiency; cross regulation; low ripples; power 840 mW; pulse-frequency modulation; pulse-width modulation; single-inductor dual-output switching converter; Adaptive control; Automatic control; CMOS process; Capacitors; Programmable control; Pulse width modulation; Pulse width modulation converters; Switches; Switching converters; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280825
