Robust multiple-phase switched-capacitor DC-DC converter with digital interleaving regulation scheme

• Published in: ISLPED'06 Proceedings of the 2006 International Symposium on Low Power Electronics and Design pp. 400 - 405
• Main Author: Ma, Dongsheng
• Format: Conference Proceeding
• Language: English
• Published: New York, NY, USA ACM 04.10.2006; IEEE
• Series: ACM Conferences
• Subjects: Charge pumps; DC-DC power converters; Design; Digital control; Hardware; Hardware > Integrated circuits; Hardware > Robustness; Hardware > Very large scale integration design > Application-specific VLSI designs > Application specific instruction set processors; Hysteresis; Interleaved codes; Interleaving Regulation; Robustness; Software and its engineering > Software notations and tools > General programming languages > Language features > Control structures; Stability; Switched-Capacitor DC-DC Converter; Switching converters; Transient response; Voltage; switched-capacitor DC-DC converter; interleaving regulation
• ISBN: 9781595934628; 1595934626
• DOI: 10.1145/1165573.1165671

An integrated switched-capacitor (SC) DC-DC converter with a digital interleaving regulation scheme is presented. By interleaving the newly-structured charge pump (CP) cells in multiple phases, the input current ripple and output voltage ripple are reduced significantly. The converter exhibits excellent robustness, even when one of the CP cells fails to operate. A fully digital controller is employed with a hysteretic control algorithm. It features dead-beat system stability and fast transient response. Hspice post-layout simulation shows that, with a 1.5 V input power supply, the SC converter accurately provides an adjustable regulated power output in a range of 1.6 to 2.7 V. The maximum output ripple is 40 mV when a full load of 0.54 W is supplied. Transient response of 1.8 ms is observed when the load current switches from half- to full-load (from 100 to 200 mA).