STM32L552CCT3PTR datasheet(38/340 Pages) STMICROELECTRONICS

38 / 340 page

Functional overview

STM32L552xx

38/340

DS12737 Rev 6

The ultra-low-power STM32L552xx devices support dynamic voltage scaling to optimize its

power consumption in Run mode. The voltage from the main regulator that supplies the

logic (VCORE) can be adjusted according to the system’s maximum operating frequency.

The main regulator operates in the following ranges:

•

Range 0 with the CPU running at up to 110 MHz.

•

Range 1 with the CPU running at up to 80 MHz.

•

Range 2 with a maximum CPU frequency of 26 MHz. All peripheral clocks are also

limited to 26 MHz.

The VCORE can be supplied by the low-power regulator, the main regulator being switched

off. The system is then in Low-power run mode.

•

Low-power run mode with the CPU running at up to 2 MHz. Peripherals with

independent clock can be clocked by the HSI16.

3.9.4

SMPS step down converter

The built-in SMPS step down converter is a highly power-efficient DC/DC non-linear

switching regulator that improves low-power performance when the VDD voltage is high

enough. This SMPS step down converter automatically enters in bypass mode when the

VDD voltage falls below 2 V in Range 0 and Range 1.

Note:

There is no automatic SMPS bypass in Range 2.

The SMPS step down converter can be configured in:

•

High-power mode (HPM): achieving a high efficiency at high current load. It is the

default selected mode after POR reset.

•

Low power mode achieving very high efficiency at low load

•

Bypass mode

The SMPS step down converter can be switched in bypass mode at any time by the

application software.

Note:

The SMPS step down converter is available only on specific package.

SMPS step down converter power supply scheme

The SMPS step down converter requires an external coil with typical value of 4.7 μH to be

connected between the VLXSMPS and the V15SMPS pins and a 4.7μF capacitor to be

connected between the V15SMPS to VSSSMPS pins. It can be switched OFF by selecting

the Bypass mode by software. Thus, only main regulator is used by the application.

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