MIC5317-2.5YMT データシートの表示（PDF） - Micrel

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MIC5317-2.5YMT

High-Performance Single 150mA LDO

Micrel 

Micrel, Inc.

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

240°C/W.

The maximum power dissipation must not be exceeded

for proper operation.

For example, when operating the MIC5317-2.8YMT at an

input voltage of 3.6V and 150mA load with a minimum

footprint layout, the maximum ambient operating

temperature TA can be determined as shown in Equation

4:

0.120W = (125°C – TA)/(240°C/W)

TA = 96°C

Eq. 4

Therefore the maximum ambient operating temperature

of 96°C is allowed in a 1mm × 1mm DFN 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

MIC5317

August 23, 2013

10

Revision 1.0

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