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MIC5316-GGCYMT Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC5316-GGCYMT Datasheet(HTML) 11 Page - Micrel Semiconductor |
11 / 14 page Micrel, Inc. MIC5316 July 2008 11 M9999-070208-A Thermal Considerations The MIC5316 is designed to provide 300mA of continuous current for both outputs in a very small package. Maximum ambient operating temperature can be calculated based upon the output current and the voltage drop across the part. Given that the input voltage is 1.8V, the output voltage is 1.5V for VOUT1, 1.0V for VOUT2 and the output current = 300mA for each output. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + VBIAS IGND Because this device is CMOS and the ground current is typically <100µA over the load range, the power dissipation contributed by the ground current is <1% and can be ignored for this calculation. PD = (1.8V – 1.5V) × 300mA + (1.8V – 1.0V) × 300mA PD = 0.33W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − = JA A J(MAX) D(MAX) θ T T P TJ(max) = 125°C, the maximum junction temperature of the die. The junction-to-ambient thermal resistance for the minimum footprint, is θJA = 70°C/W. Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5316-F5CYMT at an input voltage of 1.8V and 300mA, loads at each output with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.33W = (125°C – TA)/(70°C/W) TA = 101.9°C For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf |
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