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MIC5265-1.85YD5 Datasheet(PDF) 10 Page - Micrel Semiconductor

Part # MIC5265-1.85YD5
Description  150mA 關Cap LDO Regulator
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC5265-1.85YD5 Datasheet(HTML) 10 Page - Micrel Semiconductor

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Micrel, Inc.
MIC5265
February 2007
10
M9999-022307
MIC5265 Junction-To-Ambient Thermal Resistance
Package
θ
JA Recommended
Minimum Footprint
θ
JA 1” Sq.
Copper Clad
θ
JC
SOT-23-5
(M5 or D5)
235°C/W
125°C
145°C/W
Thermal Resistance
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
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 TA
can be determined as follows:
W
C
T
C
W
A
/
235
125
33
.
0
°
−
°
=
TA = 47.45°C
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


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