cs8183 ON Semiconductor, cs8183 Datasheet - Page 7

• Manufacturer Part Number: cs8183
• Description: Dual Micropower 200 Ma Low Dropout Tracking Regulator/line Driver
• Manufacturer: ON Semiconductor

permissible value of R
package section of the data sheet. Those packages with
R
the die temperature below 150°C.
dissipate the heat generated by the IC, and an external heat
sink will be required.
V
qJA
I
application,
I
application,
I
I
Once the value of PD(max) is known, the maximum
The value of R
In some cases, none of the packages will be sufficient to
IN
OUT1(max)
OUT2(max)
Q
OUT(max)
’s less than the calculated value in equation 2 will keep
is the quiescent current the regulator consumes at
Figure 15. Dual Output Regulator with Key
I
IN
Performance Parameters Labeled
.
is the maximum output current, for the
is the maximum output current, for the
qJA
R qJA + 150°C * T A
can then be compared with those in the
Control
Features
REGULATOR
qJA
SMART
can be calculated:
P D
I
Q
I
OUT
http://onsemi.com
V
OUT
(2)
CS8183
7
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
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
A heatsink effectively increases the surface area of the
Each material in the heat flow path between the IC and the
R
R
R
R
qJC
qCS
qSA
qJC
, it 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.
R qJA + R qJC ) R qCS ) R qSA
qJA:
qCS
and R
qSA
(3)
are