Datasheet

Package information STM32L031x4/6
118/126 DS10668 Rev 6
7.8 Thermal characteristics
The maximum chip-junction temperature, T
J
max, in degrees Celsius, may be calculated
using the following equation:
T
J
max = T
A
max + (P
D
max × Θ
JA
)
Where:
• T
A
max is the maximum ambient temperature in ° C,
•Θ
JA
is the package junction-to-ambient thermal resistance, in ° C/W,
• P
D
max is the sum of P
INT
max and P
I/O
max (P
D
max = P
INT
max + P
I/O
max),
• P
INT
max is the product of I
DD
and V
DD
, expressed in Watts. This is the maximum chip
internal power.
P
I/O
max represents the maximum power dissipation on output pins where:
P
I/O
max = Σ (V
OL
× I
OL
) + Σ((V
DD
– V
OH
) × I
OH
),
taking into account the actual V
OL
/ I
OL
and V
OH
/ I
OH
of the I/Os at low and high level in the
application.
Table 77. Thermal characteristics
Symbol Parameter Value Unit
Θ
JA
Thermal resistance junction-ambient
LQFP48 - 7 x 7 mm / 0.5 mm pitch
57
°C/W
Thermal resistance junction-ambient
UFQFPN48 - 7 x 7 mm / 0.5 mm pitch
32
Thermal resistance junction-ambient
LQFP32 - 7 x 7 mm / 0.8 mm pitch
60
Thermal resistance junction-ambient
UFQFPN32 - 5 x 5 mm / 0.5 mm pitch
39
Thermal resistance junction-ambient
UFQFPN28 - 4 x 4 mm / 0.5 mm pitch
120
Thermal resistance junction-ambient
WLCSP25 - 0.4 mm pitch
70
Thermal resistance junction-ambient
TSSOP20 - 169 mils
60
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