A 1 W class step-down micro-DC/DC converter that integrates a (4 mm/spl times/4 mm) planar inductor on a (4 mm/spl times/5 mm) power IC has been fabricated. The converter operation was stable at 3 MHz switching, achieving a power density of 5.6 W/cm/sup 3/ and a converter efficiency of approximately 80%.
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Nakazawa et al. (2000) studied this question.
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