L9001 datasheet(15/38 Pages) STMICROELECTRONICS

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DS12089 Rev 2

15/38

L9001

Power supply

The connection of VDD1 output voltage to VR1 also allows the usage of VDD1 as pre-

regulator for VDD2 in case VDD2 regulator is not disabled (see Section 5.3 for details).

To guarantee full flexibility in the system power supply architecture, VDD1 regulator can also

be disabled, if the application does not require it. This can be configured by shorting the

VR1 output pin to VS supply and CONF3 to ground.

Table 9. VDD1 regulator parameters

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VR1

Output voltage

CONF3 LOW

1 A > Iload1 > ILIM_BP1

3.2

3.3

3.4

CONF3 MID

1 A > Iload1 > ILIM_BP1

4.85

5.15

CONF3 HIGH

1 A > Iload1 > ILIM_BP1 ,

VS > 6 .5 V

5.82

6.18

Iload1

Output current

dVSR1_ac

Line transient response(1)

Not tested, guaranteed by

design, SR < 1 V/μs

-8

dVLR1_ac

Load transient

response(1)

Not tested, guaranteed by

design, Iload1 > ILIM_BP1,

dt = 10 μs

-8

VR1_byp

Output voltage in bypass

mode

CONF3 LOW

Iload1 < ILIM_BP1

3.25

3.45

CONF3 MID

Iload1 < ILIM_BP1

4.93

5.08

5.23

CONF3 HIGH

Iload1 < ILIM_BP1

5.91

6.09

6.27

Ilim1

Current limitation

2.2

2.8

SwFreq1

Switching frequency

465

kHz

RDSon1

High side RDSon

0.5

SS1

Soft start control

CONF3 LOW

(20%-80%)

15.5

V/ms

CONF3 MID

(20%-80%)

V/ms

CONF3 HIGH

(20%-80%)

24.5

V/ms

ICMP1_l

LPM current low

threshold

-3

ICMP1_h

LPM current

high

threshold

ILIM_BP1

Bypass LDO current

limitation

-22

Cout1

Capacitor at VR1

Application info

μF

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