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STM32L552CC Datasheet(PDF) 39 Page - STMicroelectronics

Part # STM32L552CC
Description  Ultra-low-power Arm® Cortex®-M33 32-bit MCUTrustZone®FPU, 165 DMIPS, up to 512 KB Flash memory, 256 KB SRAM, SMPS
PDF  340 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L552CC Datasheet(HTML) 39 Page - STMicroelectronics

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DS12737 Rev 6
39/340
STM32L552xx
Functional overview
78
Figure 6. SMPS step down converter power supply scheme
If the selected package is with the SMPS step down converter option but it is never used by
the application, it is recommend to set the SMPS power supply pins as follows:
•
VDDSMPS and VLXSMPS connected to VSS
•
V15SMPS connected to VDD
SMPS step down converter fast startup
After POR reset, the SMPS step down converter starts in High-power mode and in Low
startup mode. The low-startup feature is selected to limit the inrush current after power-on
reset.
However, it is possible to configure a faster startup on the fly and it is applied for next startup
either after a system reset or wakeup from low-power mode except Shutdown and VBAT
modes. The fast startup is selected by setting the SMPSFSTEN bit in the PWR_CR4
register.
Table 9. SMPS external components
Component
Description
Value
C
SMPS output capacitor(1)
1. For example GRM155R60J475ME87J and GRM21BR71E475KA73L.
4.7 µF
L
SMPS inductance(2)
2. For example TDK MLP2016H4R7MT.
4.7 µH
MSv49346V1
Main
regulator
VDDSMPS
VLXSMPS
VDD
SMPS
Step Down
Converter
VSSSMPS
V15SMPS
VCORE
V15SMPS
VDD
VSS



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