Integrated circuit package-on-package stacking system and method of manufacture thereof

1. An integrated circuit package-on-package stacking system comprising:

a first integrated circuit package having a first substrate and a first integrated circuit formed on the first substrate;

a metalized interposer substrate of flexible tape over the first integrated circuit package;

a stiffener integrated with the metalized interposer substrate thinner than the first substrate whereby the stiffener provides structural integrity and mitigates structural deformation, the stiffener having an extension along an outer edge of the metalized interposer substrate or the first substrate, the extension operable to cover at least a portion of the outer edge of the metalized interposer substrate or the first substrate;

a second integrated circuit package directly on the metalized interposer substrate and supported only by the metalized interposer substrate; and

a transition interconnect on the first integrated circuit package, the transition interconnect, entirely and directly below the stiffener, exposed between the first substrate and the metalized interposer substrate.

2. The system as claimed in claim 1 wherein the transition interconnect is attached to the metalized interposer substrate.

3. The system as claimed in claim 1 further comprising:

a contact pad on the metalized interposer substrate; and

a discrete component coupled to the contact pad.

4. The system as claimed in claim 1 wherein the second integrated circuit package is smaller than the first integrated circuit package.

5. The system as claimed in claim 1 further comprising an electromagnetic shield over the second integrated circuit package.

6. The system as claimed in claim 1 further comprising:

a through conductor in the first substrate of the first integrated circuit package;

wherein the metalized interposer substrate over the first integrated circuit package includes the metalized interposer substrate configured to provide a redistribution layer; and

wherein the stiffener integrated with the metalized interposer substrate includes dimensions within package extents based on the metalized interposer substrate.

7. The system as claimed in claim 1 wherein the transition interconnect is a solder ball.

8. The system as claimed in claim 3 wherein the discrete component is a passive component.

9. The system as claimed in claim 4 wherein the second integrated circuit package is a land grid array package.

10. The system as claimed in claim 5 wherein the electromagnetic shield is mounted on the metalized interposer substrate.

11. A method of manufacture of an integrated circuit package-on-package stacking system comprising:

providing a first integrated circuit package having a first substrate and a first integrated circuit formed on the first substrate;

mounting a metalized interposer substrate of flexible tape over the first integrated circuit package;

integrating a stiffener with the metalized interposer substrate thinner than the first substrate whereby the stiffener provides structural integrity and mitigates structural deformation, the stiffener having an extension along an outer edge of the metalized interposer substrate or the first substrate, the extension covering at least a portion of the outer edge of the metalized interposer substrate or the first substrate;

attaching a second integrated circuit package directly on the metalized interposer substrate and supported only by the metalized interposer substrate 130 ; and

attaching a transition interconnect on the first integrated circuit package, the transition interconnect entirely and directly below the stiffener and exposed between the first substrate and the metalized interposer substrate.

12. The method as claimed in claim 11 wherein attaching the transition interconnect includes attaching the transition interconnect to the metalized interposer substrate.

13. The method as claimed in claim 11 further comprising:

providing a contact pad on the metalized interposer substrate; and

coupling a discrete component to the contact pad.

14. The method as claimed in claim 11 wherein attaching the second integrated circuit package includes the second integrated circuit package being smaller than the first integrated circuit package.

15. The method as claimed in claim 11 further comprising providing an electromagnetic shield over the second integrated circuit package.

16. The method as claimed in claim 11 further comprising:

providing a through conductor in the first substrate of the first integrated circuit package;

wherein mounting the metalized interposer substrate includes configuring the metalized interposer substrate to provide a redistribution layer; and

wherein integrating the stiffener includes forming the stiffener with dimensions within package extents based on the metalized interposer substrate.

17. The method as claimed in claim 11 wherein attaching the transition interconnect includes providing the transition interconnect as a solder ball.

18. The method as claimed in claim 13

wherein coupling the discrete component to the contact pad includes coupling a passive component as the discrete component.

19. The method as claimed in claim 14 wherein attaching the second integrated circuit package includes attaching a land grid array package as the second integrated circuit package.

20. The method as claimed in claim 15 wherein providing the electromagnetic shield includes mounting the electromagnetic shield on the metalized interposer substrate.