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A megahertz switching DC/DC converter using FeBN thin film inductor

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5 Author(s)
Ki Hyeon Kim ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Jongryoul Kim ; Hee-Jun Kim ; Suk Hee Han
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A dual spiral sandwiched thin film inductor with a dimension of 5 mm × 5 mm was fabricated by a LIGA-like micromachined process. FeBN magnetic films were used as a core material. The inductance and quality factor value of the inductor were measured approximately 1 μH and 4 up to 5 MHz, respectively. Using the FeBN film inductor, a hybrid dc/dc converter (15 mm × 12 mm × 1.5 mm) was designed and fabricated. The circuit topology of the converter was a zero voltage switching clamp voltage (ZVS-CV) buck converter. An input of 3.6 V was bucked to 2.7 V at a switching frequency of 1.8 MHz. The maximum power was 1.5 W. The measured efficiency of the buck converter reached a maximum value of 80% and kept stable up to 300 mA of load currents at 1.8 MHz.

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Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 5 )