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SI7322DN Scheda tecnica(PDF) 8 Page - Vishay Siliconix |
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SI7322DN Scheda tecnica(HTML) 8 Page - Vishay Siliconix |
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8 / 13 page  Vishay Siliconix AN822 Document Number 71681 03-Mar-06 www.vishay.com 1 PowerPAK® 1212 Mounting and Thermal Considerations Johnson Zhao MOSFETs for switching applications are now available with die on resistances around 1 m Ω and with the capability to handle 85 A. While these die capabilities represent a major advance over what was available just a few years ago, it is important for power MOSFET packaging technology to keep pace. It should be obvi- ous that degradation of a high performance die by the package is undesirable. PowerPAK is a new package technology that addresses these issues. The PowerPAK 1212-8 provides ultra-low thermal impedance in a small package that is ideal for space-constrained applications. In this application note, the PowerPAK 1212-8’s construction is described. Following this, mounting information is presented. Finally, thermal and electrical performance is discussed. THE PowerPAK PACKAGE The PowerPAK 1212-8 package (Figure 1) is a deriva- tive of PowerPAK SO-8. It utilizes the same packaging technology, maximizing the die area. The bottom of the die attach pad is exposed to provide a direct, low resis- tance thermal path to the substrate the device is mounted on. The PowerPAK 1212-8 thus translates the benefits of the PowerPAK SO-8 into a smaller package, with the same level of thermal performance. (Please refer to application note “PowerPAK SO-8 Mounting and Thermal Considerations.”) The PowerPAK 1212-8 has a footprint area compara- ble to TSOP-6. It is over 40 % smaller than standard TSSOP-8. Its die capacity is more than twice the size of the standard TSOP-6’s. It has thermal performance an order of magnitude better than the SO-8, and 20 times better than TSSOP-8. Its thermal performance is better than all current SMT packages in the market. It will take the advantage of any PC board heat sink capability. Bringing the junction temperature down also increases the die efficiency by around 20 % compared with TSSOP-8. For applications where bigger pack- ages are typically required solely for thermal consider- ation, the PowerPAK 1212-8 is a good option. Both the single and dual PowerPAK 1212-8 utilize the same pin-outs as the single and dual PowerPAK SO-8. The low 1.05 mm PowerPAK height profile makes both versions an excellent choice for applications with space constraints. PowerPAK 1212 SINGLE MOUNTING To take the advantage of the single PowerPAK 1212-8’s thermal performance see Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs. Click on the PowerPAK 1212-8 single in the index of this document. In this figure, the drain land pattern is given to make full contact to the drain pad on the PowerPAK package. This land pattern can be extended to the left, right, and top of the drawn pattern. This extension will serve to increase the heat dissipation by decreasing the ther- mal resistance from the foot of the PowerPAK to the PC board and therefore to the ambient. Note that increasing the drain land area beyond a certain point will yield little decrease in foot-to-board and foot-to- ambient thermal resistance. Under specific conditions of board configuration, copper weight, and layer stack, experiments have found that adding copper beyond an area of about 0.3 to 0.5 in2 of will yield little improve- ment in thermal performance. Figure 1. PowerPAK 1212 Devices |
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