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STM32H745II Datasheet(PDF) 113 Page - STMicroelectronics

Part # STM32H745II
Description  Dual 32-bit Arm® Cortex®-M7 up to 480MHz and -M4 MCUs,up to 2MB Flash, 1MB RAM, 46 com. and analog interfaces, SMPS
PDF  252 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32H745II Datasheet(HTML) 113 Page - STMicroelectronics

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DS12923 Rev 1
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STM32H745xI/G
Electrical characteristics
228
6.3.3
SMPS step-down converter
The devices embed a high power efficiency SMPS step-down converter. SMPS
characteristics for external usage are given in Table 27. The SMPS step-down converter
requires external components that are specified in Figure 16 and Table 26.
Figure 16.
External components for SMPS step-down converter
1. When bypassing the voltage regulator, the two 2.2 µF VCAP capacitors are not required and should be
replaced by two 100 nF decoupling capacitors.
2. This value corresponds to CEXT typical value. A variation of +/-20% is tolerated.
MSv61398V2
VCAP
VCAP
VDDLDO
VDDLDO
VDDSMPS
VDDSMPS
VLXSMPS
VLXSMPS
V reg
(OFF)
V reg
(OFF)
VDD
VDD
SMPS
(ON)
SMPS
(ON)
VSSSMPS
VSSSMPS
VFBSMPS
VFBSMPS
VSS
VSS
VCORE
VCORE
Cin
L
Cout1
Cout2
Cfilt
VCAP
VCAP
VDDLDO
VDDLDO
VDDSMPS
VDDSMPS
VLXSMPS
VLXSMPS
V reg
(ON)
V reg
(ON)
VDD
VDD
SMPS
P
(ON
N)
SMPS
(ON)
VSSSMPS
VSSSMPS
VFBSMPS
VFBSMPS
VSS
VSS
VCORE
VCORE
Cin
L
2xCout
CEXT
Cfilt
Direct SMPS supply
External SMPS supply, LDO supplied
by SMPS
VDD_
External
VDD_
External
Table 26. Characteristics of SMPS step-down converter external components
Symbol
Parameter
Conditions
Cin
Capacitance of external capacitor on VDDSMPS
4.7 µF
ESR of external capacitor
100 mΩ
Cfilt
Capacitance of external capacitor on VLXSMPS pin
220 pF
COUT
Capacitance of external capacitor on VFBSMPS pin
10 µF
ESR of external capacitor
20 mΩ
L
Inductance of external Inductor on VLXSMPS pin
2.2 µH
-
Serial DC resistor
150 mΩ
ISAT
DC current at which the inductance drops 30% from
its value without current.
1.7 A
IRMS
Average current for a 40 °C rise: rated current for
which the temperature of the inductor is raised 40°C
by DC current
1.4 A



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