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CS8151YT7 Fiches technique(PDF) 7 Page - Cherry Semiconductor Corporation

No de pièce CS8151YT7
Description  5V, 100mA Low Dropout Linear Regulator with WATCHDOG, RESET, & WAKE UP
Download  8 Pages
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Fabricant  CHERRY [Cherry Semiconductor Corporation]
Site Internet  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8151YT7 Fiches technique(HTML) 7 Page - Cherry Semiconductor Corporation

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7
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 too is a function of package type. RQCS and RQSA
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.
150¡C - T
A
PD
Application Diagram
Heat Sinks
VIN
Smart
Regulator
VOUT
IOUT
IIN
IQ
Control
Features
}
Figure 6. Single output regulator with key performance parameters
labeled.
CDelay
CDelay
WAKE UP
______
RESET
WDI
VOUT
V
IN
C2
VCC
I/O
I/O
BATTERY
Microprocessor
CS8151
______
RESET
C1
Gnd
Application Diagram


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