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6.3.3
Board power supply - SMPS / LDO configuration
STM32H7B3I-EVAL supports four "SMPS / LDO" configurations of the STM32H7B3LIH6QU microcontroller
described in
Table
1.
LDO supply only
2.
SMPS supply only (Default configuration)
3.
SMPS and LDO supplies cascaded
4.
SMPS and LDO supplies (SMPS supplies 1V8 to board as well)
Some PCB reworks are needed to change power configuration as shown in
Signal name
SMPS
LDO
3V3_MCU = VDD_LDO
VFBSD = GND
3V3_SMPS_IN = GND
3V3_MCU = 3V3_SMPS_IN
VDD_SMPS_IND_OUT = VDD_LDO
VDD_SMPS_IND_OUT = VCAP
VCAP capacitor
VCAP capacitor
VFBSD = VCAP
VFBSD = VDD_LDO
VDD_SMPS_IND_OUT = 1V8_AO
1V8_AO capacitor
1. The default setting is in bold.
UM2662 - Rev 1
Figure 10.
10:
Table 10.
Internal SMPS / LDO and board configuration
Supply config 1:
Setting
-
SB37
R251
SB10
R22
SB3
SB5
C121
C126
R263
R262
SB4
C21
MCU Power : SMPS / LDO
Table
Supply config 2:
LDD only
(1)
SMPS only
Figure 11
Figure 12
OFF
ON
ON
OFF
X
-
X
-
X
-
X
X
-
X
-
X
2.2 uF
100 nF
2.2 uF
100 nF
-
X
-
-
-
-
-
-
UM2662
Power supply
10:
Supply config 3:
Supply config 4:
SMPS and LDO
external SMPS
cascaded
Figure 13
Figure 14
ON
ON
ON
ON
-
-
-
-
-
-
X
X
X
X
-
-
2.2 uF
2.2 uF
2.2 uF
2.2 uF
-
-
X
X
-
X
-
X
page 19/95
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