Datasheet

 2018 Microchip Technology Inc. DS20006006A-page 11
MIC5501/2/3/4
Substituting PD 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
minimum footprint is 250°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5501-YMT at an
input voltage of 3.6V and 300 mA load with a minimum
footprint layout, the maximum ambient operating
temperature T
A
can be determined as follows:
EQUATION 4-4:
Therefore, the maximum ambient operating
temperature allowed in a 1 mm × 1 mm DFN package
is 65°C. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Microchip’s Designing
with Low-Dropout Voltage Regulators handbook.
0.240W 125CT
A
–250C/W=
T
A
65C=