I have TPS7A4901DGNT and TPS7A3001MDGNTEP LDOs. Voltage drops are 5 V and 2 V respectively. Should I use heatsink with this parts?
Behtan Umut Mercan
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Operating at a 5V drop with max 150mA with thermal resistance of 63.4 gives a C increase of 47.55C. If operating the part at ambient that puts the part at 72.55C.
Operating at a 2V drop with max 200mA with thermal resistance of 69.3 gives a C increase of 27.72C. If operating the part at ambient 52.72C.
Both of these temperatures are within the safety range of operation. If operating above ambient temperatures, 25C, the first method to increase thermal performance that I would recommend is to see what from this app note you can implement into your design. The thermal resistances given above from the datasheets are derived from the JEDEC standards. This means that using the design decisions in the document can decrease the thermal resistance of the part on your board. At this time, assuming ambient of 25C, putting on a heatsink is unnecessary.