ncv4279c ON Semiconductor, ncv4279c Datasheet - Page 9

• Manufacturer Part Number: ncv4279c
• Description: 5.0 V Micropower 150 Ma Ldo Linear Regulator With Delay, Adjustable Reset, And Monitor Flag
• Manufacturer: ON Semiconductor

package to improve the flow of heat away from the IC and
into the surrounding air.
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of R
where:
A heatsink effectively increases the surface area of the
Each material in the heat flow path between the IC and the
R
R
R
θJC
θCS
θSA
= the junction- -to- -case thermal resistance,
= the case- -to- -heatsink thermal resistance, and
= the heatsink- -to- -ambient thermal resistance.
R θJA = R θJC + R θCS + R θSA
HEATSINKS
θJA
:
http://onsemi.com
(3)
9
R
functions of the package type, heatsink and the interface
between them. These values appear in heatsink data sheets
of heat sink manufacturers.
the application note, AN1040/D, “Mounting Considerations
for
ON Semiconductor web site.
ON Semiconductor applications note AN1040/D.
θJA
R
Further mounting and cooling information is available in
Thermal, mounting, and heatsinking are discussed in the
θJC
, it too is a function of package type. R
Power
appears in the package section of the data sheet. Like
Semiconductors”
located
θCS
and R
in
θSA
the
are