MIC5363 Datasheet, PDF (9/12 Pages) Micrel Semiconductor – High-PSRR, 300mA, μCap LDO in 1.2mm × 1.2mm Thin MLF®

Micrel, Inc.
Substituting P_D for P_D(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 standard footprint is
173°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating a 2.8V application with an
input voltage of 3.6V and 300mA output with a standard
footprint layout, the maximum ambient operating
temperature T_A can be determined as follows:
0.24W = (125°C − T_A) / (173°C/W)
T_A = 83°C
Therefore, a MIC5363-2.8YMT application with a 300mA
output current can accept an ambient operating
temperature of 83°C in a 1.2mm x 1.2mm Thin MLF^®
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
MIC5363/4
April 2012
9
M9999-043012-A