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Electrolytic capacitor replacement is possible due to large capacitance in MLCCs. Along with the increasing high integration of the primary LSI and IC components in electronic devices, there has been a trend toward low voltage in the power supplies which supply these components. In addition, power consumption has also increased with the progression of multi-functionality and the trend toward the use of high current continues. To support the trends toward low voltage and high current, the power supplies of electronic devices have switched from intermediate bus converters to adopt dispersed power supply systems which place multiple miniature DC-DC converters (POL converters) near the LSI and IC loads. In a POL converter, multiple capacitors are externally attached. Previously, aluminum and tantalum capacitors were used in particular due to the need for large capacitance in output smoothing capacitors. However, the difficulty in miniaturizing these electrolytic capacitors is a hindrance to reducing the circuit space. In addition, they possess significant problems with self-heating due to ripple currents. The MLCCs used in many electronic devices are capacitors with superior characteristics, but their capacitance is comparatively low and they have been used primarily in filter and high-frequency circuits. However, with the advancements in the technology for thinning and multi-layering the MLCC dielectric materials in recent years, large-capacitance MLCCs that are between several dozen to over 100 μF have been developed, enabling the replacement of electrolytic capacitors.
