STPMIC25APQR datasheet(31/145 Pages) STMICROELECTRONICS

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4.3

Buck converters

General description

The STPMIC25 includes 7 buck converters that are optimized to supply circuits with high current consumption

and meet fast transient response requirements.

All converters are based on an adaptive constant-on-time controller (COT) that guarantees an excellent transient

response and high efficiency across a wide range of operating conditions.

Each converter can work in two power modes: HP mode and LP mode. These modes differ both in performance

and quiescent current consumption. The highest performance can be reached in HP mode.

While in LP mode, the STPMIC25 has a much lower consumption and reduced general buck converter

performance.

The switching frequency of the converter is typically 2 MHz in a steady-state CCM condition.

In a typical MPU application:

•

BUCK1 is primarily dedicated to supply power to the VDDCPU domain.

•

BUCK2 is primarily dedicated to supply power to the VDDCORE domain.

•

BUCK3 is primarily dedicated to supply power to the VDDGPU domain.

•

BUCK4 is primarily dedicated to supply power to the VDD (VIO) domain.

•

BUCK5 is primarily dedicated to supply power to the VDDA18 domain.

•

BUCK6 is primarily dedicated to supply power to the DDR memory and VDDQDDR domains.

•

BUCK7's general purpose is to supply power to application peripherals.

BUCK1, BUCK2, BUCK3, BUCK6, and BUCK7 have excellent load transient responses across operating

conditions.

BUCK4 and BUCK5 supply sensitive power domains and they have a low output voltage ripple across operating

conditions.

STPMIC25

Power regulator descriptions

DS14278 - Rev 3

page 31/145

STPMIC25APQR Datasheet(PDF) 31 Page - STMicroelectronics