Microelectronic package with surface mounted passive element
A microelectronic package includes a packaging substrate having a chip mounting surface; a chip mounted on the chip mounting surface of the packaging substrate with the chip's active surface facing down to the chip mounting surface; a plurality of input/output (I/O) pads distributed on the active surface of the chip; and a discrete passive element mounted on the active surface of the chip. The discrete passive element may be a decoupling capacitor, a resistor, or an inductor.
1. A microelectronic package, comprising:
a packaging substrate having a chip mounting surface;
a chip mounted on the chip mounting surface of the packaging substrate with the chip's active surface facing down to the chip mounting surface;
a plurality of input/output (I/O) pads distributed on the active surface of the chip;
a redistribution layer (RDL) structure directly on the active surface of the chip between the chip and the chip mounting surface of the packaging substrate;
a cavity recessed into the RDL structure; and
a discrete passive element mounted within the cavity.
2. The microelectronic package according to claim 1 , wherein four side edges of the chip are encapsulated and surrounded by a molding compound.
3. The microelectronic package according to claim 1 , wherein the discrete passive element comprises a decoupling capacitor, a resistor, or an inductor.
4. The microelectronic package according to claim 1 , wherein the plurality of I/O pads comprise a ground I/O pad and a power I/O pad.
5. The microelectronic package according to claim 4 , wherein the discrete passive element is a decoupling capacitor comprising a first terminal and a second terminal, and wherein the first terminal is electrically connected to the ground I/O pad through a first bump pad in the RDL structure and the second terminal is electrically connected to the power I/O pad through a second bump pad in the RDL structure.
6. The microelectronic package according to claim 1 , wherein the discrete passive element is directly mounted on the RDL structure.
7. The microelectronic package according to claim 1 further comprising a plurality of bumps on RDL structure.
8. The microelectronic package according to claim 7 , wherein the plurality of bumps has a bump height.
9. The microelectronic package according to claim 8 , wherein the discrete passive element has a thickness smaller than the bump height.