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RT9198-30PV Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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RT9198-30PV Datasheet(HTML) 10 Page - Richtek Technology Corporation |
10 / 18 page RT9198/A 10 DS9198/A-12 May 2008 www.richtek.com For recommended operating conditions specification of RT9198/A, 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-23-3/TSOT- 23-5/SOT-23-3/SOT-23-5 package is 250 °C/W, SC-70-5 and SC-82 package is 333 °C/W and WDFN-6L 2x2 package is 165 °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)/250 = 400mW (TSOT-23-3/ TSOT-23-5/SOT-23-3/SOT-23-5) PD(MAX) = (125 °C − 25°C)/333 = 300mW (SC-70-5/SC-82) PD(MAX) = (125 °C − 25°C) / 165 = 606mW (WDFN-6L 2x2) The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. For RT9198/A 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 15 30 45 60 75 90 105 120 135 Ambient Temperature (°C) SOT-23-3/SOT-23-5 TSOT-23-3/TSOT-23-5 SC 70-5 SC-82 WDFN-6L 2x2 |
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