STW4510 datasheet(30/57 Pages) STMICROELECTRONICS

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STw4510

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3.3.2

Vsdc1 step-down DC/DC converter

Vsdc1 step down DC/DC converter is suitable to supply the core of the processor. Vsdc1

generates the regulated power supply with a very high efficiency. The 15 voltage levels

enable dynamic voltage suitable for any supply voltage of CMOS process. The regulated

output voltage levels are adjustable by the power control registers (

Power control register @

05h) via I2C interface. The power up and down is controlled by the signal Pwren.

The step down DC/DC converter runs on the internal RC oscillator.

Main features:

●

Programmable output voltage:

–

Vsdc1_sel [1:0] pads is fixed to 00 (directly connected to ground)

–

15 levels from 1.0 V to 1.5 V (vsdc1_prg [3:0] bits of power control register -

Power

control register @ 05h)

●

Fixed voltage can also be selected with Vsdc1_sel[1:0] (feature only available on the

die and on the 6 mm x 6 mm package):

–

01: fixed output voltage1.5V

–

10: fixed output voltage1.3V

–

11: fixed output voltage1.4V

●

2 power domains:

–

High power mode (HPM), 600 mA full load

–

Power down mode when step down DC/DC converter is switched off, no

consumption. The switch ON/OFF is controlled by the Pwren signal. VddOK

signal indicates to the processor that Vsdc1 supply is in the specified range.

●

Soft start circuitry from power off to high power mode

●

Specification guaranteed with input voltage from 2.7 V up to 5.5 V

Note:

High voltage level changes can be performed according to the device monitoring

constraints. Please refer to the application note AN2537 which explains how to change

VCORE value with high steps.

STW4510 Datasheet(PDF) 30 Page - STMicroelectronics

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