Patent ID: 7196907
Filing Date: 2007-03-27
Classification: H01R

Abstract:
1. An improved Land/Ball Grid Array (L/BGA) integrated circuit assembly, comprising: a bolster plate; a printed circuit board (PCB) above the bolster plate; a L/BGA socket mounted on the PCB; a L/BGA package mounted on and aligned with the L/BGA socket, the L/BGA package comprising: an elasto-plastic stiffener mounted on the package substrate of the L/BGA package, the elasto-plastic stiffener sharing a pressure with the semiconductor chip; a frame mounted on the PCB and surrounding the L/BGA socket, the L/BGA package, and the elasto-plastic stiffener; a heat transfer device mounted on the L/BGA package, the elasto-plastic stiffener, and the frame, wherein: the assembly is secured with fasteners through the heat transfer device, the frame, the PCB, and the bolster plate so that a top surface of the L/BGA package have intimate contact with a bottom surface of the heat transfer device; the elasto-plastic stiffener is plastically deformed under the elasto-plastic stiffener's portion of the pressure to conform the elasto-plastic stiffener to vertical variations of elements above and below the elasto-plastic stiffener; and the plastic deformation of the elasto-plastic stiffener defines an upper bound for the elasto-plastic stiffener's portion of the pressure, which in turn defines the semiconductor chip's portion of the pressure.