Abstract
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.
Original language | English (US) |
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Article number | 6193182 |
Pages (from-to) | 1557-1567 |
Number of pages | 11 |
Journal | IEEE Journal of Solid-State Circuits |
Volume | 47 |
Issue number | 7 |
DOIs | |
State | Published - 2012 |
Externally published | Yes |
Keywords
- Buck converter
- CMOS power delivery
- DC-DC converter
- feed-forward
- merged two-stage
- power management
- soft charging
- switched capacitor converter
ASJC Scopus subject areas
- Electrical and Electronic Engineering