ISL28474 Intersil Corporation, ISL28474 Datasheet - Page 18

• Manufacturer Part Number: ISL28474
• Description: (ISL28274 / ISL28474) Rail-to-Rail Input-Output Instrumentation Amplifier and Precision Operational Amplifier
• Manufacturer: Intersil Corporation

Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (T
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related in Equation 1:
where:
• PD
• PD
where:
• T
• θ
• PD
• V
• I
• V
• R
T
PD
JMAX
dissipation of each amplifier in the package (PD
Equation 2:
application
MAX
MAX
JA
MAX
S
OUTMAX
L
MAXTOTAL
MAX
MAX
= Load resistance
= Supply voltage
= Thermal resistance of the package
=
= Maximum supply current of 1 amplifier
=
= Maximum ambient temperature
T
for each amplifier can be calculated as shown in
= Maximum power dissipation of 1 amplifier
2*V
MAX
= Maximum output voltage swing of the
S
+
×
is the sum of the maximum power
(
I
θ
SMAX
JA
xPD
+
MAXTOTAL
(
V
S
18
- V
OUTMAX
JMAX
)
) for all applications
)
×
V
--------------------------- -
OUTMAX
R
L
MAX
ISL28274, ISL28474
(EQ. 2)
(EQ. 1)
)
December 13, 2006
FN6345.0