CS8361 Cherry Semiconductor Corporation, CS8361 Datasheet - Page 5

• Manufacturer Part Number: CS8361
• Description: 5V Dual Micropower Low Dropout Regulator with ENABLE and RESET
• Manufacturer: Cherry Semiconductor Corporation

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
Figure 2: 5V, 8V Regulator
Figure 3: Dual 5V Regulator
B+
** C2 and C3 are required for stability.
B+
* C1 is required if regulator is located far from power supply filter.
** C2 and C3 are required for stability.
* C1 is required if regulator is located far from power supply filter.
R
0.1 F
QJA
0.1 F
= R
QJC
C1*
Heat Sinks
C1*
+ R
QJA
QCS
:
Gnd
V
For V
Gnd
IN
V
V
IN
+ R
TRK
CS8361
TRK
QSA
CS8361
~ V
~ 8V, R1/R2 ~ 0.6
STBY
ENABLE
RESET
ENABLE
V
RESET
V
Application Notes: continued
V
STBY
(1 + R1/R2)
Test & Application Circuits
TRK
V
Adj
STBY
TRK
Adj
(3)
R3
R1
R1
5
where:
R
R
are functions of the package type, heat sink and the inter-
face between them. These values appear in heat sink data
sheets of heat sink manufacturers.
C3**
C3**
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
R2
= the junctionÐtoÐcase thermal resistance,
= the caseÐtoÐheat sink thermal resistance, and
= the heat sinkÐtoÐambient thermal resistance.
10 F
ESR<8
10 F
ESR<8
C2**
C2**
5V, 100mA
5V, 100mA
SW 8V,
250mA
SW 5V,
250mA
10 F
ESR<8
10 F
ESR<8
V
Gnd
V
Gnd
RESET
I/O
RESET
I/O
DD
DD
MCU
MCU
QCS
and R
QSA