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RT9013-33PU5 Datasheet(PDF) 9 Page - Richtek Technology Corporation |
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RT9013-33PU5 Datasheet(HTML) 9 Page - Richtek Technology Corporation |
9 / 12 page RT9013 Preliminary 9 DS9013-05 August 2007 www.richtek.com Figure 2. Derating Curves for RT9013 Packages Where TJ(MAX) is the maximum operation junction temperature, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT9013, where TJ(MAX) is the maximum junction temperature of the die (125 °C) and TA is the operated ambient temperature. The junction to ambient thermal resistance θJA (θJA is layout dependent) for WDFN-6L 2x2 package is 165 °C/W, SOT-23-5 package is 250°C/W and SC-70-5 package is 333 °C/W on the standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA = 25 °C can be calculated by following formula : PD(MAX) = (125 °C − 25°C) / 165 = 0.606 W for WDFN-6L 2x2 packages PD(MAX) = (125 °C − 25°C) / 250 = 0.400 W for SOT-23-5 packages PD(MAX) = (125 °C − 25°C) / 333 = 0.300 W for SC-70-5 packages The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. For RT9013 packages, the Figure 2 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 12.5 25 37.5 50 62.5 75 87.5 100 113 125 Ambient Temperature ( °C) Single Layer PCB WDFN-6L 2x2 SOT-23-5 SC-70-5 |
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