Hardware layout and configuration UM2408
22/51 UM2408 Rev 2
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 an
output power supply for an ST Zio shield or an extension board. In this case, the maximum
current of the power source specified in
Table 9
When the 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 a 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. Refer to Table 10 for the 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 and
LDO cascaded
Supply config 5:
external SMPS
SMPS OFF ON ON ON
LDO ON OFF ON ON
SB25 X - XX
R33 X - XX
SB74 X - XX
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 XX
SB79 - X X-
SB75 - X -X
SB76 - X -X
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