A monolithic step-down SC power converter with frequency-programmable subthreshold z-domain DPWM control for ultra-low power microsystems
作者： Ling Su , Dongsheng Ma , A. Paul Brokaw
DOI: 10.1109/ESSCIRC.2008.4681791
关键词: Capacitor 、 Low-power electronics 、 Engineering 、 Electronic engineering 、 Charge pump 、 CMOS 、 Pulse-width modulation 、 Control theory 、 Electrical engineering 、 Pulse-frequency modulation 、 Subthreshold conduction
摘要: This paper presents a fully integrated switched-capacitor (SC) power converter for ultra-low microsystems. The design features an efficient step-down charge pump and frequency-programmable digital feedback controller. controller is designed in the subthreshold region to reduce dissipation significantly. It employs programmable switching frequency pulse-width modulation (DPWM) maintain high efficiency under various loading scenarios, without causing random noise spectrum as pulse-frequency (PFM). monolithic implementation effectively suppresses noises glitches introduced by parasitic components from traditional bonding, packaging PCB wiring. test prototype was fabricated with 0.35-mum CMOS N-well process. supplies variable output 0.8 1.5 V 400 muW 7.5 mW precisely, ranging 200 KHz 1 MHz. achieves 66.7% of only 147.5 muW.
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