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STW4510 Datasheet(PDF) 28 Page - STMicroelectronics

No. de pieza STW4510
Descripción Electrónicos  2 step-down DC/DC converters / 5 LDO power management
PDF  57 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW4510 Datasheet(HTML) 28 Page - STMicroelectronics

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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
01
Vsdc1 @ 1.2V
OFF
ON
Value can be
changed
OFF
Vdig @ 1.2V
(alive)
No effect
No effect
No effect
ON
Vsdc2 @ 1.8V
(alive)
Sleep mode
HPM
No effect
ON
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
No effect
Switch ON/OFF
and value can be
changed
OFF



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