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RT9193-16PU5 Datasheet(PDF) 9 Page - Richtek Technology Corporation |
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RT9193-16PU5 Datasheet(HTML) 9 Page - Richtek Technology Corporation |
9 / 14 page RT9193 9 DS9193-11 May 2008 www.richtek.com For recommended operating conditions specification of RT9193, where TJ(MAX) is the maximum junction temperature of the die (125 °C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance ( θJA is layout dependent) for TSOT-23-5/ SOT-23-5 package is 250 °C/W, SC-70-5 package is 333°C/ W, WDFN-6L 2x2 package is 165 °C/W and MSOP-8 package is 160 °C/W on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA= 25 °C can be calculated by following formula : PD(MAX) = (125 °C−25°C) / 333 = 300mW for SC-70-5 PD(MAX) = (125 °C−25°C) / 250 = 400mW for TSOT-23-5/ SOT-23-5 PD(MAX) = (125 °C−25°C) / 165 = 606mW for WDFN-6L 2x2 PD(MAX) = (125 °C−25°C) / 160 = 625mW for MSOP-8 The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. For RT9193 packages, the Figure 2 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. Figure 2. Derating Curve for Packages 0 100 200 300 400 500 600 700 0 25 50 75 100 125 Ambient Temperature (°C) TSOT-23-5/ SOT-23-5 SC 70-5 WDFN-6L 2x2 MSOP-8 |
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