Package leadframe for dual side assembly
Embodiments of a leadframe for a device packaging are used not only for structural support and connectivity to the I/O pins to the external world, but also for housing and/or mounting devices above and below the leadframe. Being electrically conductive, the leadframe also serves as a low resistance interconnect and good current carrier between the bondpads on one device or between the bondpads on different devices above and/or below the leadframe.
1. A method for assembling a packaged part, the method comprising:
positioning a first device on an adhesive guide;
placing a recessed first side of a leadframe over the first device, wherein the leadframe is conductive;
aligning the leadframe over the first device using the adhesive guide;
connecting the first device directly to the leadframe using an electrically conductive material;
mounting a second device directly to a second side of the leadframe; and
patterning the leadframe with at least one cutout and wirebonding through the cutout an electrical connection between the first device and the second device.
2. The assembling method of claim 1 further comprising patterning the leadframe with at least one cutout and beveling corners of the at least one cutout.
3. The assembling method of claim 1 further comprising patterning the leadframe with at least one cutout and two electrically isolated pieces, a first piece defining a high voltage side and a second piece defining a low voltage side.
4. The assembling method of claim 3 further comprising electrically connecting a PowerDie to a high voltage side and also to a low voltage side; and mounting the PowerDie to the leadframe using a conductive material.
5. The assembling method of claim 1 further comprising extending the leadframe continuously across an interior width of the packaged part, and positioning the leadframe between package pinouts located on substantially opposite sides of the package.
6. The assembling method of claim 1 further comprising exposing a bottom side of the first device and locating the exposed bottom side substantially in a same plane as an exposed face of pinouts on the packaged part's bottom side.
7. A method for assembling a packaged part, the method comprising:
positioning a first device on an adhesive guide;
placing a recessed first side of a leadframe over the first device, wherein the leadframe is conductive;
exposing a bottom side of the first device and locating the exposed bottom side substantially in a same plane as an exposed face of pinouts on the packaged part's bottom side;
aligning the leadframe over the first device using the adhesive guide;
connecting the first device directly to the leadframe using an electrically conductive material; and
mounting a second device directly to a second side of the leadframe.
8. The assembling method of claim 7 further comprising patterning the leadframe with at least one cutout and beveling corners of the at least one cutout.
9. The assembling method of claim 7 further comprising patterning the leadframe with at least one cutout and two electrically isolated pieces, a first piece defining a high voltage side and a second piece defining a low voltage side.
10. The assembling method of claim 9 further comprising electrically connecting a PowerDie to the high voltage side and also to the low voltage side; and mounting the PowerDie to the leadframe using a conductive material.
11. The assembling method of claim 7 further comprising extending the leadframe continuously across an interior width of the packaged part, and positioning the leadframe between package pinouts located on substantially opposite sides of the package.