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MIC5265-1.85YD5 Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC5265-1.85YD5 Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 11 page Micrel, Inc. MIC5265 February 2007 10 M9999-022307 MIC5265 Junction-To-Ambient Thermal Resistance Package θ JA Recommended Minimum Footprint θ JA 1” Sq. Copper Clad θ JC SOT-23-5 (M5 or D5) 235°C/W 125°C 145°C/W Thermal Resistance Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to- ambient thermal resistance for the minimum footprint is 235 C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5265-2.8YD5 at an input voltage of 5.0V at 150mA with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: W C T C W A / 235 125 33 . 0 ° − ° = TA = 47.45°C Therefore, a 2.8V application at 150mA of output current can accept an ambient operating temperature of 47°C in a SOT-23-5 package. 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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