EL5220C Elantec Semiconductor, Inc. (acquired by Intersil), EL5220C Datasheet - Page 11

• Manufacturer Part Number: EL5220C
• Description: Dual 12MHz Rail-to-Rail, I/o Op-amp
• Manufacturer: Elantec Semiconductor, Inc. (acquired by Intersil)

Power Dissipation
With the high-output drive capability of the EL5220C
and EL5420C amplifiers, it is possible to exceed the
125°C “absolute-maximum junction temperature” under
certain load current conditions. Therefore, it is important
to calculate the maximum junction temperature for the
application to determine if load conditions need to be
modified for the amplifier to remain in the safe operating
area.
The maximum power dissipation allowed in a package is
determined according to:
where:
The maximum power dissipation actually produced by
an IC is the total quiescent supply current times the total
power supply voltage, plus the power in the IC due to the
loads, or:
T
T
P
Figure 2. Operation with Beyond-the-Rails
JA
JMAX
AMAX
DMAX
P
DMAX
= Thermal Resistance of the Package
= Maximum Junction Temperature
= Maximum Ambient Temperature
= Maximum Power Dissipation in the Package
1V
1V
=
P
DMAX
i
V
S
=
I
SMAX
T
------------------------------------------------
Input
JMAX
+
100µs
V
S
–
+
JA
T
–
AMAX
V
V
T
A
V
OUT
A
S
V
IN
=25°C
=±2.5V
=1
=6V
i
P-P
I
LOAD
i
11
when sourcing, and:
when sinking.
where
If we set the two P
we can solve for R
ures 3, 4, and 5 provide a convenient way to see if the
device will overheat. The maximum safe power dissipa-
tion can be found graphically, based on the package type
and the ambient temperature. By using the previous
equation, it is a simple matter to see if P
the device's power derating curves. To ensure proper
operation, it is important to observe the recommended
derating curves in Figures 3, 4, and 5.
12MHz Rail-to-Rail Input-Output Op Amps
i = 1 to 2 for Dual and 1 to 4 for Quad
V
I
V
I
SMAX
LOAD
S
OUT
Figure 3. Package Power Dissipation vs
P
= Total Supply Voltage
1200
1000
DMAX
800
600
400
200
i = Maximum Output Voltage of the Application
0
i = Load Current
= Maximum Supply Current Per Amplifier
EL5220C, EL5420C
0
JEDEC JESD51-7 High Effective Thermal Conductivity (4-
Layer) Test Board
LPP exposed diepad soldered to PCB per JESD51-5
870mW
1.136W
1.0W
=
Ambient Temperature
i
25
JA
V
MSOP8
=115°C/W
LOAD
DMAX
S
Ambient Temperature (°C)
I
50
SMAX
i to avoid device overheat. Fig-
JA
equations equal to each other,
TSSOP14
=100°C/W
+
75
V
85
OUT
i
100
JA
–
MAX T
SO14
=88°C/W
V
S
-
DMAX
J
=125°C
125
I
LOAD
exceeds
150
i