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LTM8025 Datasheet(PDF) 15 Page - Linear Technology

Part No. LTM8025
Description  36V, 3A Step-Down Module Regulator
Download  22 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTM8025 Datasheet(HTML) 15 Page - Linear Technology

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LTM8025
15
8025fc
For more information www.linear.com/LTM8025
applicaTions inForMaTion
Thermal Considerations
The LTM8025 output current may need to be derated if it
is required to operate in a high ambient temperature or
deliver a large amount of continuous power. The amount
of current derating is dependent upon the input voltage,
output power and ambient temperature. The temperature
rise curves given in the Typical Performance Character-
istics section can be used as a guide. These curves were
generated by a LTM8025 mounted to a 58cm2 4-layer FR4
printed circuit board. Boards of other sizes and layer count
can exhibit different thermal behavior, so it is incumbent
upon the user to verify proper operation over the intended
system’sline,loadandenvironmentaloperatingconditions.
The junction to air and junction to board thermal resis-
tances given in the Pin Configuration diagram may also
be used to estimate the LTM8025 internal temperature.
These thermal coefficients are determined for maximum
outputpowerperJESD51-9“JEDECStandard,TestBoards
for Area Array Surface Mount Package Thermal Measure-
ments” through analysis and physical correlation. Bear in
mind that the actual thermal resistance of the LTM8025
to the printed circuit board depends upon the design of
the circuit board.
The die temperature of the LTM8025 must be lower than
the maximum rating of 125°C, so care should be taken in
the layout of the circuit to ensure good heat sinking of the
LTM8025. The bulk of the heat flow out of the LTM8025
is through the bottom of the module and the LGA pads
into the printed circuit board. Consequently a poor printed
circuit board design can cause excessive heating, result-
ing in impaired performance or reliability. Please refer to
the PCB Layout section for printed circuit board design
suggestions.
The LTM8025 is equipped with a thermal shutdown that
will inhibit power switching at high junction temperatures.
Theactivationthresholdofthisfunction,however,isabove
125°C to avoid interfering with normal operation. Thus,
it follows that prolonged or repetitive operation under a
condition in which the thermal shutdown activates neces-
sarily means that the internal components are subjected
to temperatures above the 125°C rating for prolonged
or repetitive intervals, which may damage or impair the
reliability of the device.
Finally, be aware that at high ambient temperatures the
internalSchottkydiodewillhavesignificantleakagecurrent
increasing the quiescent current of the LTM8025.


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