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.

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