L9001 datasheet(6/38 Pages) STMICROELECTRONICS

6 / 38 page

General description

L9001

6/38

DS12089 Rev 2

General description

The L9001 is a power management device targeting various automotive applications. The

device contains three voltage regulators: VDD1, VDD2 and ADCLDO.

1.1

VDD1 regulator

VDD1 is an asynchronous switch mode power supply with integrated FET and can be used

as pre-regulator for VDD2 and/or to supply external devices such as μC, transceivers, or

sensors. The regulated voltage can be configured to 3.3 V / 5 V or 6 V by a proper

connection of CONF3 input pin. Current capability is up to 1A, and the device provides an

internal peak current limitation as protection. In addition VDD1 output voltage is monitored

through VR1 pin and if the voltage goes outside the specified range, RSTN1 output is

asserted low; when the fault disappears the output is released after the specified hold time.

If the application does not require it, VDD1 regulator can be also disabled without the need

to insert additional external components.

1.2

VDD2 regulator

VDD2 is a configurable power supply with integrated FET that can be used as BUCK

regulator (also referenced as BUCK2 in this case) or as LDO regulator (also referenced as

LDO2 in this case) to supply μC or μC core. In fact the regulated voltage is highly

configurable and can be adjusted between 0.8 V and 5 V by proper sizing of external divider

on FB2 input pin. The choice between BUCK and LDO is done by setting the proper

connection of CONF2 input pin. Current capability is up to 1 A in BUCK mode and 300 mA

in LDO mode and the device provides an internal limitation according to the chosen option

(BUCK / LDO). In addition VDD2 output voltage is monitored through FB2 input pin and if

the voltage goes outside the specified range, RSTN2 output is asserted low; when the fault

disappears the output is released after the specified hold time.

The input voltage of VDD2 regulator can be connected to:



VS supply voltage, in a configuration in which VDD2 is directly supplied from battery



VDD1 output, in a configuration where VDD2 is supplied by VDD1 pre regulator

The connection to VS battery will automatically disable VDD1 as the device does not allow

the independent operation of VDD1 and VDD2 both supplied from battery.

If the application does not require it, VDD2 regulator can be disabled without the need to

insert additional external components.

1.3

ADCLDO regulator

ADCLDO is a LDO power supply with integrated FET which can be used for external loads

with low current demand. The regulated voltage VADC can be configured to 3.3 V / 5 V by a

proper connection of CONF1 input pin. Current capability is up to 100 mA, and the device

provides an internal current limitation as protection. In addition VADC output voltage is

monitored internally and if the voltage goes outside the specified range, ADCMON output is

asserted low; when the fault disappears the output is released after the specified hold time.

L9001 데이터시트(PDF) 6 Page - STMicroelectronics

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