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Merged Two-Stage Power Converter With Soft Charging Switched-Capacitor Stage in 180 nm CMOS

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2 Author(s)
Pilawa-Podgurski, R.C.N. ; Massachusetts Inst. of Technol., Cambridge, MA, USA ; Perreault, D.J.

In this paper, we introduce a merged two-stage dc-dc power converter for low-voltage power delivery. By separating the transformation and regulation function of a dc-dc power converter into two stages, both large voltage transformation and high switching frequency can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages. This mode of operation enables improved efficiency and/or power density in the switched-capacitor stage. A 5-to-1 V, 0.8 W integrated dc-dc converter has been developed in 180 nm CMOS. The converter achieves a peak efficiency of 81%, with a regulation stage switching frequency of 10 MHz.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 7 )