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CS8126-1YTHA5 Datasheet(PDF) 7 Page - Cherry Semiconductor Corporation

Part # CS8126-1YTHA5
Description  5V, 750mA Low Dropout Linear Regulator with Delayed RESET
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8126-1YTHA5 Datasheet(HTML) 7 Page - Cherry Semiconductor Corporation

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7
Application Notes: continued
Once the value of PD(max) is known, the maximum permis-
sible value of RQJA can be calculated:
RQJA =
(2)
The value of RQJA can then be compared with those in
the package section of the data sheet. Those packages with
RQJA's less than the calculated value in equation 2 will keep
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.
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 RQJA.
RQJA = RQJC + RQCS + RQSA
(3)
where:
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheatsink thermal resistance, and
RQSA = the heatsinkÐtoÐambient thermal resistance.
RQJC appears in the package section of the data sheet. Like
RQJA, it is a function of package type. RQCS and RQSA are
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data
sheets of heat sink manufacturers.
150¡C - TA
PD
Heat Sinks
VIN
Smart
Regulator
VOUT
IOUT
IIN
IQ
Control
Features
}
Figure 1. Single output regulator with key performance parameters
labeled.


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