金属填料改性对封装嵌入式集成电压调节器中环形电感的影响

With the increasing power needs for AI and datacenter applications, dc–dc converters have to be placed close to the chiplets to deliver power efficiently. Inductors used in these converter circuits have stringent requirements that cannot be met only by modifying inductor designs. Advances in magnetic materials are required to ensure the converter circuits meet high efficiencies. This work investigates the effect of shape, crystalline structure, and annealing of metal fillers of a metal-polymer composite (MPC) system comprising Fe-6.5 wt% Si and bisbenzocyclobutene (BCB) on magnetic permeability, saturation, small-signal losses ( r_acx ), and large-signal losses ( R_acx ). Magnetic permeabilities between 15.4 and 18.67 were achieved with a low-loss tangent between 0.016 and 0.032 at 5 MHz depending on the loading, heat treatment, and shape of filler. All the samples with varying loading of the filler shapes in the polymer matrix did not show saturation behavior up to 4-A dc. Through measurements, it was also concluded that annealing can help in the reduction of small- and large-signal losses in the magnetic core. The results presented in this work can help to drive innovation in magnetic materials used in dc–dc converters independent of conversion ratios.