STW4510 datasheet(28/57 Pages) STMICROELECTRONICS

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STw4510

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3.3

Power management module

STw4510 includes step-down DC/DC converters and regulators that supply the portable

application. These supplies can work in different modes depending on the application

needs.

The nominal mode is called high power mode (HPM). The mode is selected by Pwren signal

according to the state of the portable processor and of STw4510.

When Pwren signal = “0”, sleep mode and Vsdc1_OFF are selected. High power mode is

selected as default when Pwren signal = “1”.

When the STw4510 has it Pwren signal = “0”, the Vsdc2, Vanai (i = 1 to 3) current output are

reduced to save energy via the lower capability output current.

Each supply has a dedicated battery power supply and Vdig that has low output voltage

capabilities (1V, 1.2V, 1.5V) can be supplied by Vsdc2 to minimize the regulator voltage

drop, thus, reducing the power dissipation.

Each supply can be controlled and powered down through I2C programming, Pwren or by

Pon signals, excepted Vdig and Vsdc2. Power down can be programmed by default at

power up (special device configuration with dedicated start-up, see

Section 3.2.5: Power

supplies at start-up) or during the application management (Power control register @ 06h,

Power control register @ 07h, Power control register @ 08h).

In addition, an output current limitation prevents high current delivery in case of output short

circuit. Band gap, biasing and references have been performed by dedicated blocks.

Table 12.

Power supplies status

Power supplies

PWREN status

I2C interface

control

Status after Pon -

Initial status

Vsdc1 @ 1.2V

OFF

Value can be

changed

OFF

Vdig @ 1.2V

(alive)

No effect

Vsdc2 @ 1.8V

(alive)

Sleep mode

HPM

No effect

Vana1 @ 2.8V

Sleep mode

HPM

Switch ON/OFF

OFF

Vana3 @ 2.8V

Sleep mode

HPM

Switch ON/OFF

OFF

Vana2 @ 3.3V

Sleep mode

HPM

Switch ON/OFF

OFF

Vmmc @ 3.0V

No effect

Switch ON/OFF

and value can be

changed

OFF

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