Datasheet

Package information STM32F302x6 STM32F302x8
134/138 DocID025147 Rev 7
Example 2: High-temperature application
Using the same rules, it is possible to address applications that run at high ambient
temperatures with a low dissipation, as long as junction temperature T
J
remains within the
specified range.
Assuming the following application conditions:
Maximum ambient temperature T
Amax
= 115 °C (measured according to JESD51-2),
I
DDmax
= 20 mA, V
DD
= 3.5 V, maximum 9 I/Os used at the same time in output at low
level with I
OL
= 8 mA, V
OL
= 0.4 V
P
INTmax
=
20 mA × 3.5 V= 70 mW
P
IOmax
=
9 × 8 mA × 0.4 V = 28.8 mW
This gives: P
INTmax
= 70 mW and P
IOmax
= 28.8 mW:
P
Dmax
=
70
+
28.8 = 98.8 mW
Thus: P
Dmax
= 98.8 mW
Using the values obtained in Table 82 T
Jmax
is calculated as follows:
For LQFP100, 45°C/W
T
Jmax
= 115°C + (45°C/W × 98.8 mW) = 115 °C + 4.44°C = 119.44°C
This is within the range of the suffix 7 version parts (–40 < T
J
< 125 °C).
In this case, parts must be ordered at least with the temperature range suffix 7 (see
Section 8: Ordering information).
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