ncv4279bdw ON Semiconductor, ncv4279bdw Datasheet - Page 9

• Manufacturer Part Number: ncv4279bdw
• 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
A heat sink effectively increases the surface area of the
Each material in the heat flow path between the IC and the
R qJA + R qJC ) R qCS ) R qSA
HEAT SINKS
qJA
:
http://onsemi.com
NCV4279B
(3)
9
where:
R
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
qJA
R
R
R
R
qJC
qCS
qSA
qJC
, it too is a function of package type. R
= the junction−to−case thermal resistance,
appears in the package section of the data sheet. Like
= the case−to−heatsink thermal resistance, and
= the heatsink−to−ambient thermal resistance.
qCS
and R
qSA
are