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AP1184K550L Datasheet(PDF) 6 Page - Anachip Corp |
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AP1184K550L Datasheet(HTML) 6 Page - Anachip Corp |
6 / 11 page 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator AP1184 Anachip Corp. www.anachip.com.tw Rev.1.1 Sep 7, 2004 6/11 Functional Descriptions(Continued) Thermal Design The AP1184-XXX incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Although this device can operate with junction temperatures in the range of 150 oC, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation, the junction temperature is kept below this number. The example below shows the steps in selecting the proper surface mount package. Assuming, the following conditions: Vout=2.5V Vin=3.3V Vctrl=5V Iout=2A DC Avg. Calculate the maximum power dissipation using the following equation: Pd=Iout*(Vin-Vout)+(Iout/60)*(Vctrl-Vout) Pd=2*(3.3-2.5)+(2/60)*(5-2.5)=1.68W Using table below select the proper package and the amount of copper board needed. Package Copper Area θJA ( oC/W) Max Pd (Ta=25 oC) Max Pd (Ta=45 oC) SOP7 1.0” X 1.0” 65 1.7W 1.4W TO263 Pad Size-1.4”X1.4” 25-45 2.4W-4.4W 2.0W-3.6W Note: Above table is based on the maximum junction temperature of 135 oC. As shown in the above table, any of the two packages will do the job. For low cost applications the SOP7 package is recommended. |
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