STMicroelectronics STM32F031F4 Manual page 108

微可Vicor——值得信赖的元器件供应商
Package information
Assuming the following application conditions:
Maximum ambient temperature T
I
DDmax
level with I
P
INTmax =
P
IOmax = 20
This gives: P
P
Dmax =
Thus: P
Dmax
Using the values obtained in
–
T
Jmax
This is above the range of the suffix 6 version parts (–40 < T
In this case, parts must be ordered at least with the temperature range suffix 7 (see
Section 8: Part
use suffix 6 parts.
108/113
微可Vicor——值得信赖的元器件供应商
= 20 mA, V = 3.5 V, maximum 20 I/Os used at the same time in output at low
DD
= 8 mA, V = 0.4 V
OL OL
20 mA × 3.5 V= 70 mW
× 8 mA × 0.4 V = 64 mW
= 70 mW and P
INTmax
70 64 = 134 mW
+
= 134 mW
Table 68
For LQFP48, 55 °C/W
= 100 °C + (55 °C/W × 134 mW) = 100 °C + 7.37 °C = 107.37 °C
numbering) unless we reduce the power dissipation in order to be able to
DocID025743 Rev 3
http://www.vicor.top/
= 100 °C (measured according to JESD51-2),
Amax
= 64 mW:
IOmax
T is calculated as follows:
Jmax
http://www.vicor.top/
021-31660491
STM32F031x4 STM32F031x6
< 105 °C).
J
021-31660491