Title :
High-efficiency dc-dc converter chip size module with integrated soft ferrite
Author :
Hayashi, Zenchi ; Katayama, Yasushi ; Edo, Masaharu ; Nishio, Haruhiko
Author_Institution :
Device Technol. Lab., Fuji Electr. Corp. R&D Ltd., Nagano, Japan
Abstract :
This letter describes a power supply module with an ultrathin, high-efficiency switching dc-dc converter system in order to meet increasing demand for smaller, thinner and lighter devices in portable electronic equipment. Usually, the inductor is the largest passive components in a converter system. We formed inductors on ferrite wafers as a substrate to mount an IC chip using thin film technology. This realized a significantly small and thin module. The external size of the module is 3.5 mm × 3.5 mm × 1.0 mm. Its maximum output power is 1 W, and its efficiency is up to 93.4%. A high power density of 81.6 W/cc was realized.
Keywords :
CMOS analogue integrated circuits; DC-DC power convertors; ferrite devices; magnetic thin film devices; power integrated circuits; power supplies to apparatus; thin film inductors; 1 W; 93.4 percent; CMOS control circuit; IC chip mounting; dc-dc converter chip size module; external size; ferrite wafer inductors; high-efficiency switching dc-dc converter system; integrated soft ferrite; maximum output power; microinductor; portable electronic equipment; thin film technology; DC-DC power converters; Electronic equipment; Ferrites; Power generation; Power supplies; Pulse width modulation; Regulators; Switching converters; Thin film inductors; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.815895
