CS8101 Cherry Semiconductor Corporation, CS8101 Datasheet - Page 6

• Manufacturer Part Number: CS8101
• Description: Micropower 5V/ 100mA Low Dropout Linear Regulator with RESET and ENABLE
• Manufacturer: Cherry Semiconductor Corporation

In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
Figure 6: Single output regulator with key performance parameters
labeled.
V
IN
I
IN
}
Control
Features
Regulator
Smart
I
Q
I
OUT
Application Notes: continued
V
OUT
6
A heatsink 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
where:
R
R
are functions of the package type, heatsink and the inter-
face between them. These values appear in heatsink data
sheets of heatsink manufacturers.
QJC
QJA
R
R
R
QJC
QCS
QSA
, it too is a function of package type. R
appears in the package section of the data sheet. Like
= the junctionÐtoÐcase thermal resistance,
= the caseÐtoÐheatsink thermal resistance, and
= the heatsinkÐtoÐambient thermal resistance.
R
QJA
= R
QJC
Heatsinks
+ R
QJA
:
QCS
+ R
QSA
QCS
and R
QSA
(3)