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LM2793LDX Scheda tecnica(PDF) 9 Page - National Semiconductor (TI) |
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LM2793LDX Scheda tecnica(HTML) 9 Page - National Semiconductor (TI) |
9 / 10 page Application Information (Continued) T J =TA +(PDMAX x θ JA) = 85˚C + (0.149W x 55˚C/W) = 93˚C The junction temperature rating takes precedence over the ambient temperature rating. The LM2793 may be operated outside the ambient temperature rating, so long as the junc- tion temperature of the device does not exceed the maxi- mum operating rating of 100˚C. The maximum ambient tem- perature rating must be derated in applications where high power dissipation and/or poor thermal resistance causes the junction temperature to exceed 100˚C. PCB Layout Considerations The LLP is a leadframe based Chip Scale Package (CSP) with very good thermal properties. This package has an exposed DAP (die attach pad) at the center of the package measuring 2.0mm x 1.2mm. The main advantage of this exposed DAP is to offer lower thermal resistance when it is soldered to the thermal land on the PCB. For PCB layout, National highly recommends a 1:1 ratio between the pack- age and the PCB thermal land. To further enhance thermal conductivity, the PCB thermal land may include vias to a ground plane. For more detailed instructions on mounting LLP packages, please refer to National Semiconductor Ap- plication Note AN-1187. www.national.com 9 |
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