MODELLING AND ANALYSIS OF FULLY INTEGRATED 3:2 SWITCHED CAPACITOR DC-DC CONVERTER
Keywords:
witched-capacitor converter, charge-multiplier, series-parallel, performance analysis, DC-DC converter.Abstract
A type of DC-DC power converter known as a switched-capacitor converter efficiently changes one voltage level to another by employing switches and capacitors. They provide high-performance point-of-load voltage regulation for digital systems. This paper investigates general steady-state performance model of 3:2 series-parallel switched capacitor DC-DC converter. The existing basic SC converter analysis is extended to derive minimum achievable power loss for efficiency enhancement that suffers from both conduction and switching losses. The method relies on charge-multiplier approach and analysis is done to achieve 48mA load current realized on a 22nm technology node. According to the findings, a unit cell's switch size equates to 1Ω on-resistance, and a switching frequency of at least 200MHz is needed to achieve the target efficiency of more than 85% and an output voltage more than 0.72V.
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