MIC5375 datasheet(9/18 Pages) MICREL

9 / 18 page

Micrel, Inc.

MIC5375/6/7/8

January 2009

M9999-011309-B

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

250°C/W.

The maximum power dissipation must not be exceeded

for proper operation.

For example, when operating the MIC5375-2.8YMT 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 follows:

0.12W = (125°C – TA)/(250°C/W)

TA = 95°C

Therefore the maximum ambient operating temperature

of 95°C is allowed in a 1mm x 1mm TMLF

® 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

MIC5375 Datasheet(PDF) 9 Page - Micrel Semiconductor