MODELLING AND ANALYSIS OF FULLY INTEGRATED 3:2 SWITCHED CAPACITOR 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 22  nm technology node. According to the findings, a unit cell's switch size equates to 1Ω on resistance, and a switching frequency of at least 200 MHz is needed to achieve the target efficiency  of more than 85% and an output voltage more than 0.72V.