Embedded inductor for semiconductor device circuit

Abstract

An embedded inductor which includes a spiral conductive inductor embedded in a magnetically permeable body composed of particles of pre-sintered magnetically permeable (e.g. ferromagnetic) material and an epoxy binder.

What is claimed is:  
     
         1 . An electronic device comprising: 
 an electrically conductive inductor; 
 a magnetically permeable body that includes particles of a pre-sintered magnetically permeable material in an epoxy binder; and  
 wherein said electrically conductive inductor is embedded in said magnetically permeable body.  
   
     
     
         2 . An electronic device according to  claim 1 , wherein said electrically conductive inductor is spiral.  
     
     
         3 . An electronic device according to  claim 1 , wherein said electrically conductive inductor is comprised of copper.  
     
     
         4 . An electronic device according to  claim 1 , wherein said electrically conductive inductor is comprised of electrically conductive epoxy.  
     
     
         5 . An electronic device according to  claim 4 , wherein said electrically conductive epoxy includes silver particles.  
     
     
         6 . An electronic device according to  claim 1 , wherein said magnetically permeable material comprises pre-sintered permalloy.  
     
     
         7 . An electronic device according to  claim 1 , wherein said magnetically permeable material comprises NiZn Ferrite.  
     
     
         8 . An electronic device according to  claim 1 , wherein said magnetically permeable material comprises MnZn Ferrite.  
     
     
         9 . An electronic device according to  claim 1 , further comprising an insulated printed circuit board, wherein said magnetically permeable body is disposed on a surface of said insulated printed circuit board.  
     
     
         10 . An electronic device according to  claim 9 , further comprising an insulation layer disposed over said magnetically permeable body.  
     
     
         11 . An electronic device according to  claim 10 , wherein said electrically conductive inductor includes a terminal at each respective end thereof, said terminals being electrically connected to respective connection pads.  
     
     
         12 . An electronic device according to  claim 11 , wherein said connection pads are disposed on a free surface of one of said insulation layer and said insulated printed circuit board and each connected electrically to a respective terminal through a via.  
     
     
         13 . An electronic device according to  claim 9 , wherein said electrically conductive inductor is spiral.  
     
     
         14 . An electronic device according to  claim 1 , wherein said electrically conductive inductor includes a terminal at each respective end thereof, said terminals being electrically connected to respective connection pads.  
     
     
         15 . An electronic device according to  claim 14 , further comprising another electronic element electrically connected to at least one of said connection pads to form an electronic circuit.  
     
     
         16 . An electronic device according to  claim 10 , wherein said electronic circuit is a buck converter.  
     
     
         17 . An electronic device according to  claim 1 , wherein said magnetically permeable material is ferromagnetic.