ISL28118 INTERSIL [Intersil Corporation], ISL28118 Datasheet - Page 19

• Manufacturer Part Number: ISL28118
• Description: 40V Precision Single Supply Rail-to-Rail Output Low Power Operational Amplifiers
• Manufacturer: INTERSIL [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
applications 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 using Equation 1:
T
where:
• P
JMAX
dissipation of each amplifier in the package (PD
DMAXTOTAL
=
T
MAX
+
is the sum of the maximum power
θ
JA
xPD
MAXTOTAL
19
JMAX
) for all
ISL28118, ISL28218
(EQ. 1)
MAX
)
• PD
where:
• T
• θ
• PD
• V
• I
• V
• R
Equation 2:
PD
amplifier
application
qMAX
JA
MAX
S
OUTMAX
L
MAX
MAX
MAX
= Load resistance
= Total supply voltage
= Thermal resistance of the package
= Maximum ambient temperature
= Maximum quiescent supply current of 1
for each amplifier can be calculated using
= Maximum power dissipation of 1 amplifier
=
= Maximum output voltage swing of the
V
S
×
I
qMAX
+
(
V
S
- V
OUTMAX
)
×
V
--------------------------- -
OUTMAX
November 22, 2010
R
L
FN7532.1
(EQ. 2)