NCV4299 ON Semiconductor, NCV4299 Datasheet - Page 18

• Manufacturer Part Number: NCV4299
• Description: 5.0v, 3.3v/150ma Low Quiescent Current Ldo W/reset, Delay, Adjustable Reset, Early Warning And Enable
• Manufacturer: ON Semiconductor

Heatsinks
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 heatsink 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
qJA
:
http://onsemi.com
(eq. 7)
NCV4299
18
where:
R
R
R
R
functions of the package type, heatsink and the interface
between them. These values appear in heatsink data sheets
of heatsink manufacturers. Thermal, mounting, and
heatsinking are discussed in the ON Semiconductor
application
ON Semiconductor website.
qJC
qCS
qSA
qJA
R
qJC
, it too is a function of package type. R
= the junction-to-case thermal resistance,
= the case-to-heatsink thermal resistance, and
= the heatsink-to-ambient thermal resistance.
appears in the package section of the data sheet. Like
note
AN1040/D,
available
qCS
and R
on
qSA
the
are