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MIC5305-4.75BD5 Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC5305-4.75BD5 Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 12 page Micrel, Inc. MIC5305 June 2007 10 M9999-062507 Table 1 shows junction-to-ambient thermal resistance for the MIC5305 in the 6-pin 2mm × 2mm MLF ® package. Package θJA Recommended Minimum Footprint θJC 6-Pin 2x2 MLF ® 93°C/W 2°C/W Table 1. 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 (the minimum amount of copper that you can solder the part to) is 93°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5305-2.9BML at an input voltage of 5.0V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: C/W 93 T C 125 0.32W A ° − ° = TA = 95.2°C Therefore, a 2.9V application at 150mA of output current can accept an ambient operating temperature of 95.2°C in a 6-pin 2mm x 2mm MLF ® package. For a full dis- cussion 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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