CS8281YDPR5 ON Semiconductor, CS8281YDPR5 Datasheet - Page 5

• Manufacturer Part Number: CS8281YDPR5
• Description: IC REG LDO DUAL MICROPWR D2PAK-5
• Manufacturer: ON Semiconductor

Specifications of CS8281YDPR5

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 6 ~ 26 V
• Voltage - Dropout (typical): 0.4V @ 250mA, 0.4V @ 100mA
• Number Of Regulators: 2
• Current - Output: 250mA, 100mA
• Current - Limit (min): 260mA, 105mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-5, D²Pak (5 leads + Tab), TO-263BA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: CS8281YDPR5OS

ENABLE
is high, V
The integrity of the ENABLE pin allows it to be tied to the
battery line through an external resistor (Figure 3). It will
withstand load dump potentials in this configuration.
Calculating Power Dissipation in a
Dual Output Linear Regulator
regulator (Figure 4) is
where:
permissible value of R
P D(max) + V IN(max) * V OUT1(min) I OUT1(max) )
V
The ENABLE function controls V
The maximum power dissipation for a dual output
V
V
V
I
application,
I
application, and
I
I
Once the value of P
BAT
OUT1(max)
OUT2(max)
Q
OUT1(max)
IN(max)
OUT1(min)
OUT2(min)
10 k
is the quiescent current the regulator consumes at both
OUT1
0.1 mF
V IN(max) * V OUT2(min) I OUT2(max) ) V IN(max) IQ
is the maximum input voltage,
and I
is the minimum output voltage from V
is the minimum output voltage from V
is the maximum output current, for the
is the maximum output current, for the
is on. When ENABLE is low, V
R QJA +
OUT2(max)
V
ENABLE
qJA
IN
Figure 3.
D(max)
can be calculated:
150°C * T A
.
GND
is known, the maximum
P D
V
V
OUT1
OUT2
OUT1
. When ENABLE
22 mF
ESR < 8W
22 mF
ESR < 8W
OUT1
http://onsemi.com
OUT1
OUT2
is off.
(1)
(2)
CS8281
,
,
5
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
heatsink will be required.
Heat Sinks
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
qJA
The value of R
In some cases, none of the packages will be sufficient to
A heat sink effectively increases the surface area of the
Each material in the heat flow path between the IC and the
R
R
R
R
V
IN
qJC
qCS
qSA
qJC
’s less than the calculated value in equation 2 will keep
, it too is a function of package type. R
Figure 4. Dual Output Regulator With Key
= 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.
I
IN
Performance Parameters Labeled.
R QJA + R QJC ) R QCS ) R QSA
qJA
REGULATOR
can be compared with those in the
Control
Features
SMART
qJA:
I
Q
I
I
OUT1
OUT2
qCS
and R
V
V
OUT2
qSA
OUT1
are
(3)