Title :
Planar inductor with ferrite layers for DC-DC converter
Author :
Mano, Yasuhiko ; Bae, Seok ; Moon, Jinseok ; Jung, Hyungmi ; Oh, Yongsoo
Author_Institution :
Central R&D Inst., Samsung Electro-mechanics Co., Ltd, Suwon, South Korea
Abstract :
The demand for miniaturized magnetic passive devices in power modules has been rapidly growing with mobile handset technology. Thus, we developed a minimum construction and sized planar inductor for micro DC-DC converters with a ferrite plating method and conventional flexible PCB processes. The ferrite plating process made it possible to deposit Ni-Zn spinel ferrite on a Cu electroplated planar coil without a non-magnetic insulation layer. These samples of a planar inductor with ferrite layers achieved a high quality factor of 17∼24 at 3∼5 MHz and inductance of 1.25∼1-30 μH in 6.0×6.0×0.19∼0.20 mm3, respectively. In addition, the estimated power loss of this developed inductor at 5 MHz in a switching buck DC-DC converter was about 15.7%. It showed excellent capability for portable power systems.
Keywords :
DC-DC power convertors; Q-factor; electroplating; ferrite devices; magnetic thin films; nickel compounds; switching convertors; thin film inductors; zinc compounds; 0.19 to 0.20 mm; 3 to 5 MHz; 6.0 mm; Ni0.15Zn0.68Fe2.15O4; ferrite layer planar inductor; ferrite plating method; flexible PCB processes; inductor power loss; magnetic passive devices; micro DC-DC converters; quality factor; spinel ferrite; switching buck DC-DC converter; Coils; DC-DC power converters; Ferrites; Inductance; Inductors; Insulation; Magnetic devices; Mobile handsets; Multichip modules; Q factor;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. The 13th International Conference on
Print_ISBN :
0-7803-8994-8
DOI :
10.1109/SENSOR.2005.1496561
