A New Isolation Technology for Automotive Power-Integrated-Circuit Applications

In this paper, a new bulk silicon isolation structure with wafer-thick trenches is proposed for automotive (42 V) power-integrated-circuit applications. This technology provides the advantages of complete isolation with lower wafer cost and higher thermal-dissipation capability as compared with the silicon-on-insulator technology. Experimental results show that the new isolation structure can provide complete electrical isolation and with a 13% reduction in thermal resistance.