LP38856-1.2EVAL National Semiconductor, LP38856-1.2EVAL Datasheet - Page 2
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LP38856-1.2EVAL
Manufacturer Part Number
LP38856-1.2EVAL
Description
BOARD EVALUATION LP38856-1.2
Manufacturer
National Semiconductor
Series
PowerWise®r
Specifications of LP38856-1.2EVAL
Channels Per Ic
1 - Single
Voltage - Output
1.2V
Current - Output
3A
Voltage - Input
3 ~ 5.5V
Regulator Type
Positive Fixed
Operating Temperature
-40°C ~ 125°C
Board Type
Fully Populated
Utilized Ic / Part
LP38856
Lead Free Status / RoHS Status
Not applicable / Not applicable
PCB Layout
20193502
Evaluation Board Component and Pin Layout
Power Dissipation
The TO-263 package alone has a junction to ambient ther-
mal resistance (θ
) rating of 60˚C/W. When mounted on the
JA
LP38856S evaluation board the θ
rating is approximately
JA
37˚C/W.
Although there is only approximately 0.28 square inches of
copper area immediately under the tab, the top copper sur-
face area is extended to additional copper area on the
bottom of the board by five thermal vias.
With the 37˚C/W thermal rating the LP38856S evaluation
board will dissipate a maximum of 2.75W with T
= 25˚C.
A
20193506
FIGURE 2. Maximum Power Dissipation vs Ambient
Temperature
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