ST STM32U3 Application Note page 9

The figures below details the power supply schemes for packages with and without SMPS.
AN6011 - Rev 1
Figure 3. Power supply scheme for STM32U375/385xxxxQ (with SMPS)
1.65 – 3.6 V
3.3 V
VDDUSB
100 nF
V
DD
VDDSMPS
100 nF
10 µF
VLXSMPS
2.2 µH
1-2 x VDD11
4.7 μF, or
2 x 2.2 µF
VSSSMPS
V
DD
n x VDD
n x 100 nF
+ 10 µF
n x VSS
V
DDIO2
m x VDDIO2
m x100 nF
+ 4.7 µF
m x VSS
V
DDA
V
REF
100 nF
+ 1 µF
100 nF+ 1 µF
VBAT
Voltage regulator
SMPS
SMPS ON
SMPS OFF
LDO
V
DDIO1
OUT
GPIOs
IN
V
DDIO2
OUT
GPIOs
IN
VDDA
ADCs/
DACs/
V
REF+
OPAMPs/
V
REF-
COMPs/
VREFBUF
VSSA
AN6011
Power supply management
Backup circuitry
(LSE, RTC, TAMP,
backup registers)
Power switch
V
CORE
Kernel logic
(CPU, digital
and memories)
IO
logic
IO
logic
page 9/38