Methods for packaging integrated circuits
Techniques for packaging an integrated circuit include attaching a die to a conductive layer before forming dielectric layers on an opposing surface of the conductive layer. The conductive layer may first be formed on a carrier substrate before the die is disposed on the conductive layer. The die may be electrically coupled to the conductive layer via wires or solder bumps. The carrier substrate is removed before the dielectric layers are formed. The dielectric layers may collectively form a coreless package substrate for the integrated circuit package.
1. An integrated circuit package, comprising:
a coreless package substrate having a topmost surface and a bottommost surface, wherein the coreless package substrate lacks a core layer and includes only build-up layers and a solder mask layer;
an integrated circuit die that is mounted on the topmost surface of the coreless package substrate;
conductive bumps that protrude from the topmost surface of the coreless package substrate and that are formed directly under the integrated circuit die;
molding compound that encapsulates the integrated circuit die within the integrated circuit package; and
solder balls that are formed at the bottommost surface of the coreless package substrate.
2. The integrated circuit package of claim 1 , further comprising:
solder bumps interposed between the integrated circuit die and the conductive bumps.
3. The integrated circuit package of claim 1 , further comprising:
a protective layer formed over the integrated circuit die.
4. The integrated circuit package of claim 3 , further comprising:
an adhesive layer interposed between the protective layer and the integrated circuit die.
5. The integrated circuit package of claim 3 , wherein the adhesive layer is as wide as the protective layer.
6. The integrated circuit package of claim 1 , wherein the integrated circuit die is attached to the coreless package substrate in a flip-chip configuration.
7. The integrated circuit package of claim 1 , wherein the build-up layers include interconnect paths formed in dielectric layers.
8. The integrated circuit package of claim 7 , wherein the interconnect paths do not protrude above the topmost surface of the coreless package substrate.
9. The integrated circuit package of claim 7 , wherein the interconnect paths comprise a patterned conductive layer.
10. The integrated circuit package of claim 9 , wherein the conductive layer is patterned after the integrated circuit die has been mounted on the topmost surface.