Vertical power delivery (VPWR) is a layout used in high-performance semiconductor electronics to reduce power losses along the power delivery network. In vertical power delivery, the voltage regulator module is mounted directly below the processing unit to which it supplies power. Although vertical power delivery reduces power losses and enables flexible PCB floorplans, it can potentially trade off efficiency with increasing power density, and due to keep-out zones for decoupling capacitors (decaps), it can degrade transient power-rail performance of nearby power rails.
This disclosure describes techniques that integrate multiple power rails into a single VPWR module. To accommodate non-core power rails, the VPWR module is wider, and is therefore less power dense, benefiting its efficiency. The greater width of the VPWR module also leads to a lower weight-to-solder ratio, resulting in better manufacturability. The non-core decaps are integrated into the VPWR module, leading to a reduction, elimination, or pushing out of the keep-out zone and a superior transient performance for non-core power rails.
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N/A, "Multi-rail Integration in Vertical Power Delivery", Technical Disclosure Commons, (November 18, 2020)