ST L4909 User Manual

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L4909

EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR

■

3 OUTPUTS

- Vo1 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.

- Vo2 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.

- Vo3 : output voltage variable from 5 to 12 V;
limit current : 1.2 A.

■ ENABLE INPUT FOR EACH REGULATOR

■

FEEDBACK INPUT FOR EACH REGULATOR

■

SHORT CIRCUIT PROTECTION TO GROUND

■ OVERCURRENT WARNING

■

DRIVER FOR EXTERNAL SCR (CROWBAR
PROTECTION)

■ THERMAL SHUTDOWN

DESCRIPTION

It is a monolithic Multifunction Voltage Regulator; it
contains 3 regulators, (REG1, REG2, REG3) each
one with an enable input and a feedback input, to al­low the voltage setting via external resistive divider.

Each regulator is current limited and furthermore an
OR-ed warning signal is output (open collector, ac­tive low output) when the current in a regulator goes
above an over-current threshold (1 A typ for any reg­ulator).

When one output voltage is higherthan 20% typ of its
nominal value (for instance in case of input-to-output
short circuit), the crowbar output pin is activated, trig­gering an external SCR (connected between input
and ground) that blows the input line fuse.

MULTIWATT15

BLOCKDIAGRAM

EN1
EN2
EN3

OC

TRIG

GND

May 2000

THERMAL

SHUTDOWN

6
7
9

5

4

8

ENABLE

CONTROL

OVER

CURRENT

CHECK

REFERENCE
GENERATOR

REG1
REG2
REG3

++

REF

REF+20%

+

­+

+

­+

+

­+

REG1

-

REG2

-

REG3

-

+

3,13

+

+

14

15

+

11

10

D00AU1171

V

INA,VINB

2

V

O1

1

FB1

V

O2

FB2

V

O3

FB3

1/7

L4909

PIN CONNECTION

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

TAB CONNECTEDTO PIN 8

Table 1. Pin Description

No. Pin Name Function

1 FB1 REG1 feedback voltage input
2 Vo1 REG1 output voltage
3 VinA Input DC supply voltage
4 TRIG Trigger for external SCR (crowbar protection)
5 OC Over current warning output
6 EN1 REG1 enable input
7 EN2 REG2 enable input
8 GND Analog ground

9 EN3 REG3 enable input
10 FB3 REG3 feedback voltage input
11 Vo3 REG3 output voltage
12 N.C. Not Connected
13 VinB Input DC supply voltage
14 Vo2 REG2 output voltage
15 FB2 REG2 feedback voltage input

D00AU1153

FB2
V

O2

V

INB

N.C.
V

O3

FB3
EN3
GND
EN2
EN1
OC
TRIG
V

INA

V

O1

FB1

2/7

ABSOLUTEMAXIMUMRATINGS

Symbol Parameter Value Unit

Vin VinA,VinB input DC supply voltage 40 V

Io Vo1, Vo2, Vo3 output currents internally limited

Voc OC output voltage min (15, Vin) V

VENx ENx input voltage 15 V

Top Operating temperature range 0 to 70

Tstg Storage temperature - 40 to 150

THERMAL DATA

Symbol Parameter Value Unit

L4909

o

C

o

C

R

TH j-case

ELECTRICAL CHARACTERISTICS (C

Thermal Resistance Junction to Case 1.8 °C/W

= 100nF; Vin-Vo=5V;Io=10mA;T

out

=25°C unless otherwise

case

specified

Symbol Parameter Test Condition Min. Typ. Max. Unit

Vo1 REG1 output voltage range 5 12 V

V(FB1) REG1 feedback voltage EN1=ON; 1.22 1.27 1.32 V

Ilim1 REG1 output current limit EN1=ON; Vin-Vo1<12V 1.20 1.70 A

V

∆

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

V

∆ V

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

V

line regulation Io1=10mA; Vin-Vo1=3 to 25V

o1

o1

load regulation Io1=10 mA to 1.2A

o1

o1

Io1=10mA; Vin-Vo1=3 to 12V

Io1=10 mA to 0.5A

Vd1 REG1 drop out Io1=500mA 2.20 V

SVR1 REG1 supply voltage rejec. freq=120 Hz to 1KHz 60 dB

Vo2 REG2 output voltage range 5 12 V

V(FB2) REG2 feedback voltage EN2 = ON; 1.22 1.27 1.32 V

0.6

0.1

0.5

0.1

2%

2%

Ilim2 REG2 output current limit EN2=ON; Vin-Vo2<12V 1.20 1.70 A

∆ V

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

V

o2

∆ V

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

V

o2

line regulation Io2=10mA;Vin-Vo2=3 to 25 V

o2

load regulation Io2=10 mA to 1.2A

o2

Io2=10mA;Vin-Vo2=3 to 12 V

Io2=10 mA to 0.5A

0.6

0.1

0.5

0.1

2%

2%

Vd2 REG2 drop out Io2=500mA 2.2 V

3/7

L4909

ELECTRICAL CHARACTERISTCS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

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

∆V

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

V

o3

∆ V

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

V

o3

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

o3

load regulation Io3=10 mA to 1.2A

o3

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

Io3=10 mA to 0.5A

0.6

0.1

0.5

0.1

2%

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;

25 mA

V(TRIG) = 2V

V

ZTRIG TRIG to GND impedance SCR trigger circuit in OFF state 0.2 KΩ

V(FB)_TR FBx voltage fortrigger 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 nalfeedbackresistors not
included)

V_OC_L current_warning output

voltage

I_OC_H current_warning leakage no warning conditions

one regulator ON; Vo= 12V
two regulators ON; Vo = 12V
three regulators ON; Vo = 12V

warning conditions
Isink < 3 mA

11
20
29

mA

0.40 V

1 µA

V(OC) = 15V

I_oc/Ilim warning threshold current / limit

current

any regulator
Vin - Vout<12V

0.6

4/7

L4909

The current protection is a function of the Vce, i.e. the drop between input and output voltages (Vin-Vo). The
shape of that relationship is shown in following figure 1.

Figure 1.

Figure 2. REGULATOR TYPICAL APPLICATION

FROM

RECTIFIER

ULTRAFAST FUSE

V

INA

+5V

330nF

4.7K

PULL-UP

RESISTOR

(*) It is possible toenable the regulatorsconnecting the ENxpins to Vinthrough a 25KΩ

Suggested valueforRAxis 1.2KΩ
Thevalue of RBxmustbe choosen, depending onthe desiredoutput voltage V

V

ox

RBx=R

-1

Ax

1.27

(*)EN1

(*)EN2

(*)EN3

OC

TRIG

3

6

7

9

5

4

GND

V

INB

13

V

O1

2

V

O2

14

V

O3

11

R

B3RB2RB1

FB1

1

FB2

15

FB3

12

following the

ox?

RA3RA2R

8

100µF

A1

formula:

100µF

100nFSCR

D00AU1154

100µF

100nF

100nF

5/7

L4909

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 5 0.197

B 2.65 0.104
C 1.6 0.063
D 1 0.039

E 0.49 0.55 0.019 0.022

F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060

G1 17.53 17.78 18.03 0.690 0.700 0.710
H1 19.6 0.772
H2 20.2 0.795

L 21.9 22.2 22.5 0.862 0.874 0.886

L1 21.7 22.1 22.5 0.854 0.870 0.886
L2 17.65 18.1 0.695 0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114

M 4.25 4.55 4.85 0.167 0.179 0.191

M1 4.63 5.08 5.53 0.182 0.200 0.218

S 1.9 2.6 0.075 0.102

S1 1.9 2.6 0.075 0.102

Dia1 3.65 3.85 0.144 0.152

mm inch

OUTLINEAND

MECHANICALDATA

Multiwatt15 V

6/7

L4909

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of useofsuch information nor for anyinfringement ofpatents or otherrightsofthird partieswhichmayresultfrom its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics

2000 STMicroelectronics - All Rights Reserved

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