关键词: DC DC, 高效率, 集成电容

Abstract:

A high-efficiency boost mode electronic power management chip with on-chip capacitor is proposed.Compared to the conventional structure,the presented circuit has 11 patterns:six groups of 2×,3 groups of 3×,and 2 groups of 4× booster modes.It also has the advantage of low-ripple and so on.The chip size is greatly reduced by using MIM capacitance and accumulation NMOS capacitance in series,which increases the capacity value per unit area.The proposed circuit is implemented using SMIC 0.18 μm CMOS process.The Cadence simulation results show that the efficiency is up to 83.6% when the output voltage is 3 V.When the switching frequency is 20 MHz with the input voltage from 1 V to 1.8 V,the area of overall capacitor integrated on chip is 900 μm×900 μm and the output ripple is less than 40 mV.

Key words: DC DC;high efficiency;on chip capacitor