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AP1186T5-15L-13 Datasheet(PDF) 6 Page - Diodes Incorporated |
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AP1186T5-15L-13 Datasheet(HTML) 6 Page - Diodes Incorporated |
6 / 9 page AP1186 1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR AP1186 Rev. 1 - 0 6 of 9 MARCH 2007 www.diodes.com © Diodes Incorporated Stability The AP1186-XXX requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for the microprocessor applications use standard electrolytic capacitors with typical ESR in the range of 50 to 100mΩ and an output capacitance of 100uF to 1000uF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The AP1186-XXX takes advantage of the phenomena in making the overall regulator loop stable. For most applications a minimum of 100uF aluminum electrolytic capacitor insures both stability and good transient response. Thermal Design The AP1186-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 = 1.5A 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. 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. Function Descriptions (Continued) Package Copper Area ΘJA ( oC/W) Max Pd ( Ta = 25 oC ) Max Pd ( Ta = 45oC ) TO263 Pad Size-1.4”X1.4” 25-45 2.4W-4.4W 2.0W-3.6W |
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