UM2408 Rev 1
23/45
UM2408
Hardware layout and configuration
44
6.4.7 External
power supply output
When powered by USB, VIN or EXT, the 5V (CN8 pin 9 or CN11 pin 18) can be used as
output power supply for an ST Zio shield or an extension board. In this case, the maximum
current of the power source specified in
When STM32H7 Nucleo-144 board is power supplied by VIN, the jumper configuration must
be the following: Jumper JP2 on pin 3-4 "VIN".
The 3.3 V (CN8 pin 7 or CN11 pin 16) can be used also as power supply output. The current
is limited by the maximum current capability of the regulator U11 (1300 mA max).
6.4.8
Internal SMPS / LDO Configuration
Different internal SMPS / LDO configurations are supported. Please refer to
for
solder bridge configuration corresponding to each of them.
Table 9. External power sources maximum currents
Input power
name
Connector pins
Voltage range
Max current
Limitation
VIN
CN8 pin 15
CN11 pin 24
7 V to 11 V
800 mA
From 7 V to 11 V only and input current
capability is linked to input voltage:
– 800 mA input current when VIN=7 V
– 450 mA input current when 7 V<VIN<9 V
– 250 mA input current when9 V<VIN<11 V
EXT
CN11 pin 6
4.75 V to 5.25 V 500 mA
-
CHGR
CN1
5 V
-
-
3.3V
CN8 pin 7
CN11 pin 16
3 V to 3.6 V
-
-
Table 10. SMPS / LDO configuration
Supply config 1:
Internal LDO only
Supply config 2:
Internal SMPS only
(default)
Supply config 3:
Internal SMPS &
LDO cascaded
Supply config 5:
external SMPS
SMPS
OFF
ON
ON
ON
LDO
ON
OFF
ON
ON
SB25
X
-
X
X
R33
X
-
X
X
SB74
X
-
X
X
C58
2.2 uF
100 nF
2.2 uF
2.2 uF
C54
2.2 uF
100 nF
2.2 uF
2.2 uF
SB92
-
X
X
X
SB79
-
X
X
-
SB75
-
X
-
X
SB76
-
X
-
X
