CS8126 Cherry Semiconductor Corporation, CS8126 Datasheet - Page 7

• Manufacturer Part Number: CS8126
• Description: 5V/ 750mA Low Dropout Linear Regulator with Delayed RESET
• Manufacturer: Cherry Semiconductor Corporation

Once the value of P
sible value of R
The value of R
the package section of the data sheet. Those packages with
R
the die temperature below 150¡C.
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 1. Single output regulator with key performance parameters
labeled.
QJA
V
IN
's less than the calculated value in equation 2 will keep
I
IN
QJA
QJA
can then be compared with those in
R
can be calculated:
D(max)
QJA
}
Control
Features
Regulator
=
Smart
is known, the maximum permis-
150¡C - T
P
I
Q
D
A
I
OUT
Application Notes: continued
V
OUT
(2)
7
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
where:
R
R
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data
sheets of heat sink manufacturers.
QJC
QJA
R
R
R
QJC
QCS
QSA
, it 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
Heat Sinks
+ R
QJA
QCS
.
+ R
QSA
QCS
and R
QSA
are
(3)