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MIC5239-3.0BM Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC5239-3.0BM Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 12 page MIC5239 Micrel MIC5239 10 January 2002 0 100 200 300 400 500 600 700 800 900 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W) 85 °C 50 °C 25°C T J = 125 °C Figure 7. Copper Area vs. Power-MSOP Power Dissipation (T A) 0 100 200 300 400 500 600 700 800 900 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W) ∆T JA = Figure 8. Copper Area vs. Power-SOIC Power Dissipation ( ∆∆∆∆∆T JA) 0 100 200 300 400 500 600 700 800 900 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W) 85 °C 50 °C 25°C T J = 125 °C Figure 9. Copper Area vs. Power-SOIC Power Dissipation (T A) The same method of determining the heat sink area used for the power-MSOP-8 can be applied directly to the power- SOIC-8. The same two curves showing power dissipation versus copper area are reproduced for the power-SOIC-8 and they can be applied identically. Power SOIC-8 Thermal Characteristics The power-SOIC-8 package follows the same idea as the power-MSOP-8 package, using four ground leads with the die attach paddle to create a single-piece electrical and thermal conductor, reducing thermal resistance and increas- ing power dissipation capability. Quick Method Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Refer to Figure 9, which shows safe operating curves for three different ambient temperatures, 25 °C, 50°C, and 85°C. From these curves, the minimum amount of copper can be determined by knowing the maxi- mum power dissipation required. If the maximum ambient temperature is 50 °C, and the power dissipation is 632mW, the curve in Figure 9 shows that the required area of copper is less than 100mm2,when using the power SOIC-8. Adjustable Regulator Application MIC5239BM/MM EN GND OUT IN VIN 2 41 3 5-8 V R1 R2 1 µF OUT ADJ Figure 10. Adjustable Voltage Application The MIC5239BM can be adjusted from 1.24V to 20V by using two external resistors (Figure 10). The resistors set the output voltage based on the following equation: V OUT = VREF (1 + R R 1 2 ) Where V REF = 1.23V. Feeback resistor R2 should be no larger than 300k Ω. |
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