L4909 datasheet(4/7 Pages) STMICROELECTRONICS

Part #	L4909

Description	EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L4909

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SVR2

REG2 supply voltage rejec.

freq=120 Hz to 1KHz

60

dB

Vo3

REG3 output voltage range

5

12

V

V(FB3)

REG3 feedback voltage

EN3=ON;

1.22

1.27

1.32

V

Ilim3

REG3 output current limit

EN3=ON; Vin-Vo3<12V

1.20

1.70

A

line regulation

Io3=10mA; Vin-Vo3=3 to 25 V

Io3=10mA; Vin-Vo3=3 to 12 V

0.6

0.1

2%

load regulation

Io3=10 mA to 1.2A

Io3=10 mA to 0.5A

0.5

0.1

2%

Vd3

REG3 drop out

Io3=500mA

2.20

V

SVR3

REG3 supply voltage rejec.

freq=120 Hz to 1KHz

60

dB

ENx

enable input voltage

(active high)

STAND_BY

ON

3.5

0.8

V

Istby

current consumption in stand_by

EN1=EN2=EN3

≤0.5 V

20

µA

ITRIG

current at TRIG output

SCR trigger circuit in ON state;

V(TRIG) = 2V

25

mA

ZTRIG

TRIG to GND impedance

SCR trigger circuit in OFF state

0.2

K

Ω

V(FB)_TR

FBx voltage for trigger SCR on

any regulator

1.52

V

I(FB)

Feedback’s input current

any regulator

2

µA

I(EN)

EN’s input current

V(EN) = 5V

160

µA

Ion

current consumption in ON state

(current in the exter nal feedback resistors not

included)

one regulator ON; Vo = 12V

two regulators ON; Vo = 12V

three regulators ON; Vo = 12V

11

20

29

mA

V_OC_L

current_warning output

voltage

warning conditions

Isink < 3 mA

0.40

V

I_OC_H

current_warning leakage

no warning conditions

V(OC) = 15V

1

µA

I_oc/Ilim

warning threshold current / limit

current

any regulator

Vin - Vout <12V

0.6

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

∆V

o3

V

o3

-------------

∆V

o3

V

o3

-------------

ELECTRICAL CHARACTERISTCS (continued)

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