CS8122 Cherry Semiconductor Corporation, CS8122 Datasheet - Page 7

• Manufacturer Part Number: CS8122
• Description: 2% 5V/ 750mA Low Dropout Linear Regulator with Delayed RESET
• Manufacturer: Cherry Semiconductor Corporation

A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed
to determine the value of R
R
QJA
= R
QJC
Heat Sinks
+ R
QJA
:
QCS
+ R
QSA
Application Notes: continued
(3)
7
where:
R
R
R
R
R
are functions of the package type, heatsink and the inter-
face between them. These values appear in heat sink data
sheets of heat sink manufacturers.
QJC
QCS
QSA
QJC
QJA
, it too is a function of package type. R
= the junctionÐtoÐcase thermal resistance,
appears in the package section of the data sheet. Like
= the caseÐtoÐheatsink thermal resistance, and
= the heatsinkÐtoÐambient thermal resistance.
QCS
and R
QSA