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MIC39101-1.8BM Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC39101-1.8BM Datasheet(HTML) 11 Page - Micrel Semiconductor |
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11 / 12 page  August 2005 11 M9999-082505-B MIC39100/39101/39102 Micrel ΔT = TJ(max) – TA(max) TJ(max) = 125°C TA(max) = maximum ambient operating temperature For example, the maximum ambient temperature is 50°C, the ΔT is determined as follows: ΔT = 125°C – 50°C ΔT = 75°C Using Figure 4, the minimum amount of required copper can bedeterminedbasedontherequiredpowerdissipation.Power dissipation in a linear regulator is calculated as follows: PD = (VIN – VOUT) IOUT + VIN·IGND If we use a 2.5V output device and a 3.3V input at an output current of 1A, then our power dissipation is as follows: PD = (3.3V – 2.5V) × 1A + 3.3V × 11mA PD = 800mW + 36mW PD = 836mW From Figure 4, the minimum amount of copper required to operate this application at a ΔT of 75°C is 160mm2. 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 5, 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 as above, 836mW, the curve in Figure 5 shows that the required area of copper is 160mm2. The θJA of this package is ideally 63°C/W, but it will vary depending upon the availability of copper ground plane to which it is attached. |
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