MIC5265 Micrel Semiconductor, MIC5265 Datasheet - Page 10

• Manufacturer Part Number: MIC5265
• Description: 150mA UCap LDO Regulator
• Manufacturer: Micrel Semiconductor

Substituting P
operating temperature will give the maximum operating
conditions for the regulator circuit. The junction-to-
ambient thermal resistance for the minimum footprint is
235 ° C/W. The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5265-2.8YD5 at an
input voltage of 5.0V at 150mA with a minimum footprint
layout, the maximum ambient operating temperature T
can be determined as follows:
Micrel, Inc.
MIC5265 Junction-To-Ambient Thermal Resistance
April 2005
(M5 or D5)
SOT-23-5
Package
D
Minimum Footprint
θ
for P
JA
Recommended
Thermal Resistance
235°C/W
D(max)
and solving for the ambient
Copper Clad
θ
JA
125°C
1” Sq.
145°C/W
θ
JC
A
10
Therefore, a 2.8V application at 150mA of output current
can accept an ambient operating temperature of 47°C in
a SOT-23-5 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
T
. 0
A
33
= 47.45°C
W
=
125
235
°
°
C
C
−
/
T
W
A
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