Datasheet L4936N, L4936NH Datasheet (SGS Thomson Microelectronics)



DUAL MULTIFUNCTIONVOLTAGE REGULATOR

.STANDBYOUTPUTVOLTAGEPRECISION5V

± 2%

.

OUTPUT2TRACKEDTOTHESTANDBYOUT­PUT

.

OUTPUT 2 DISABLE FUNCTION FOR
STANDBYMODE

.VERY LOW QUIESCENT CURRENT, LESS

THAN 250µA,IN STANDBYMODE

.OUTPUT 2 VOLTAGESETTABLEFROM5 TO

20V

.OUTPUTCURRENTS: I

.

VERYLOWDROPOUT(max0.4V/0.6V)

=50mA,I02=500mA

01

.OPERATINGTRANSIENT SUPPLYVOLTAGE

UP TO 40V

.POWER-ON RESET CIRCUIT SENSING THE

STANDBYOUTPUT VOLTAGE

.

POWER-ON RESETDELAY PULSEDEFINED
BY THE EXTERNALCAPACITOR

.

EARLYWARNINGOUTPUTFOR SUPPLYUN­DERVOLTAGE

.

THERMALSHUTDOWNAND SHORTCIRCUIT
PROTECTIONS

PI N CONNECTION

(top view)

L4936N/NH

Multiwatt11

ORDERINGNUMBERS: L4936N (Multiwatt 11)

DES CRIPTI ON

TheL4936N/NHaremonolithicintegrateddualvolt­age regulators with two very low dropout outputs
andadditionalfunctionssuchaspower-onresetand
input voltagesense.They are designedfor supply­ing microcomputer controlledsystems specially in
automotiveapplications.

Multiwatt15

L4936NH (Multiwatt 15)

June 2000

TAB CONNECTED TOPIN 6

15
14

11
10

9
8
7
6
5
4
3
2
1

D94AT154

OUT2
ADJ
OUT1
SO
RES
GND
EN
CT
N.C.
SI
VS1/VS2

TAB CONNECTED TO PIN 6

13
12
11
10

9
8
7
6
5
4
3
2
1

OUT2
ADJ
OUT1
SO
N.C.
N.C.
RES
GND
EN
N.C.
CT
N.C.
SI
VS1
VS2

D95AT155

1/11

L4936N/NH

BLOCK DIAG RAM

V

V

EN

S1

REFERENCE

S2

1.23V

RESET

SI

SENSE

(optional)

REG1

REG2

2µ

2.0V

1.23V

1.23V

V

O1

V

O2

ADJ

CT
RES

SO

GND

D94AT143A

THERMAL DATA

Symbol Parameter Value Unit

R

thj-case

Note: VS1, VS2, SI pins are rated at 1500V versus positive ESD according to human body model; other pins are rated at 2000V.

2/11

ThermalResistance Junction-Case Max. 3

C/W

°

L4936N/NH

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

T

j,Tstg

I

SI

I

EN

V

EN

V

RES,VSO

I

RES,ISO

P

Note :

APPLI CATI ON CIRCUI T

DC Supply Voltage 28 V

S

TransientSupply Voltage (T < 1s) 40 V
Junctionand Storage TemperatureRange –55 to 150

Sense Input Current (V
Enable Input Current (VEN≤0.3V)
Enable Input Voltage V

≤

SI

0.3V or V

SI>VS

)

1

±

–1 mA

S

Reset and Sense OutputVoltage 20 V
Reset and Sense OutputCurrent 5 mA
Power Dissipation (TA=80°C, R

D

thheatsink

The circuit is ESD protected according to MIL–STD–883C.

=11°C/W)MW11

POWERDIP

5

1166

C

°

mA

W

mW

V

S1

C

S

REFERENCE

V

S2

EN

1.23V

RESET

SI

SENSE

(optional)

REG1

REG2

2µ

2.0V

1.23V

1.23V

D94AT144A

V

O1

V

O2

ADJ

CT
RES

SO

GND

C

O1

C

O2

CT

R

RES

V

O1

R

SO

CS≥ 1µF;C01≥ 6µF;C02≥ 10µF, ESR < 10Ω at 10KHz

3/11

L4936N/NH

ELECTRICAL CHARACTERISTICS (VS= 14V; –40°C unless otherwise specified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

V

O2-VO1

I

ADJ

V

DP1

V

V

DP2

V

V

OL 1.2

V

OLO1

V

OLO2

I

LIM1

I

LIM2

I

QSB

I

Operating Supply Voltage 25 V

S

StandbyOutput Voltage

O1

Output Voltage 2 TrackingError
(note 1)

6V ≤ V
1mA≤I

6V≤V
5mA≤I

≤ 25V

S

O1

≤

S

O2

50mA

≤

25V

500mA

≤

4.90 5.00 5.10 V

–25 +25 mV

Enable= LOW
ADJ InputCurrent IO1= 1mA; IO2= 5mA –1 0.1 1
DropoutVoltage 1 IO1= 10mA

Inputto Output Voltage

IO1

I

= 50mA

O1

VS = 4V,IO1= 35mA 0.4 V

0.1

0.2

Differencein Undervoltage
Condition

DropoutVoltage 2 IO1 = 100mA

Inputto Output Voltage

IO2

I

= 500mA

O1

VS = 4.6V,IO1= 350mA 0.6 V

0.2

0.3

Differencein Undervoltage
Condition

LineRegulation

6V ≤ V

I
Load Regulation 1
Load Regulation 2

1mA≤I
5mA≤I

Current Limit 1 VO1= 4.5V

V

≤ 25V

S

= 1mA; IO2= 5mA

O2

50mA

≤

O1

500mA

≤

O2

= 0V(note 2)

O1

55
25

100

50
Current Limit 2 VO2 = 0V 550 1000 1700 mA
Quiescent Current StandbyMode

(output2 disabled)

Quiescent Current IO1= 50mA

Q

I

= 0.3mA;TJ< 100°C

O1

2.4V

V

≥

EN

V

= 14V

S

V

= 3.5V

S

I

= 500mA

O1

210
340

0.25

0.4

0.3

0.6

20 mV

25 mV
50 mV

200
100

290
850

30 mA

µA

V
V

V
V

mA
mA

µ
µA

A

ENABLE

V

ENL

V

ENH

V

ENhyst

I

EN

4/11

EnableInput LOW Voltage

–0.3 1.5 V

(output2 active)
EnableInput HIGH Voltage 2.4 7 V
EnableHysteresis 30 75 200 mV
EnableInput Current 0V < VEN< 1.2V

2.5V < V

EN

<7V

–10

–1

–1.50–0.5

+1

µ
µ

A
A

L4936N/NH

ELECTRICAL CHARACTERISTICS (continued)

RESET

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

t

RD

t

RR

V

I

LRES

V

CTh

V

CTh, hyst

SENSE

ResetLow Threshold Voltage VS= 14V Vo1-0.4 4.7 Vo1-0.1 V

Rt

ResetThreshold Hysteresis 50 100 200 mV

Rth

ResetPulse Delay
ResetReaction Time CT= 100nF 1 0 50
ResetOutput LOW Voltage

RL

ResetOutput HIGH Leakage V
Delay Comparator Threshold 2.0 V
Delay Comparator Threshold

Hysteresis

= 100nF;tR> 100µs

C

T

= 10KΩto V

R

RES

VS= 1.5V

=5V 1 µ

RES

01

55 100 180 mV

100 mV

0.4 V

µs

A

V

Note :

V

Slth,hyst

V

SOL

I

LSO

Sense Threshold Voltage 1.16 1.23 1.35 V

Slth

Sense Threshold Hysteresis 20 100 200 mV
Sense Output LOW Voltage

Sense Output Leakage

1:V

connected to ADJ.VO2canbe setto higher values by inserting an externalresistor divider.

O2

2 : Foldbackcharacteristic

=0.8V; V

V

SI

R

=10KΩto V

SO

= 5V;VSI≥1.5V

V

SO

FUNCTI O NAL DESCRIPTI ON

TheL4936N/NHarebasedontheSGS-THOMSON
Microelectronics modular voltage regulator ap­proach.Severalout-standingfeaturesandauxiliary
functionsare providedto meet the requirementsof
supplyingthemicroprocessorsystemsusedin auto­motiveapplications.

Furthermorethe deviceis suitablealso in otherap­plicationsrequiringtwostabilizedvoltages.

The modular approach allows other features and
functionsto be realizedeasilywhen required.

STANDBYREGULATOR
The standby regulator uses an Isolated Collector

Vertical PNP transistor as the regulating element.
This structureallowsa verylow dropoutvoltage at
currentsup to 50mA. The dropoutoperationof the
standby regulator is maintained down to 2V input
supply voltage. The output voltage is regulatedup
tothetransientinputsupplyvoltageof40V.Thisfea­tureavoids functionalinterruptions whichcould be
generatedby overvoltagepulses.

The typicalcurve of the standbyoutputvoltage as a
functionof theinputsupplyvoltageisshowninfig.1.

3V

≥

S

01

0.4 V

1

µ

The current consumption of the device (quiescent
current) is less than 250µA when output 2 is dis-

abled(standbymode).The dropoutvoltage is con­trolledto reducethe quiescentcurrentpeak in the
undervoltage region and to improve the transient
responsein this region.

Thequiescentcurrentis showninfig.2asafunction
of the supplyinput voltage2.

OUTPUT2 VOLTAGE
Theoutput2 regulatoruses the sameoutputstruc-

tureas thestandbyregulator,butratedforanoutput
currentof 500mA.

The output2 regulatorworksintrackingmodewith
the standbyoutputvoltage as a referencevoltage
when the output 2 programming pin ADJ is con­nectedto V

tothe pinADJas shownin fig. 3,the outputvolt-

R

2

. By connectinga resistordividerR1,

O2

age 2 can be programmedto thevalue :

V

O2=VO1

(1 + R1/R2)

The output 2 regulator can be switched off via the
Enableinput.

A

5/11

L4936N/NH

Figure1 : OutputVoltagevs. InputVoltage.

Figure2 : QuiescentCurrent vs. SupplyVoltage.

Figure3 : ProgrammableOutput2 Voltagewith ExternalResistors.

6/11

L4936N/NH

RESETCIRCUIT
Theblockcircuitdiagramoftheresetcircuitisshown

infig.4.Theresetcircuitsupervisesthestandbyout­put voltage. The reset threshold of 4.7Vis defined
by the internal reference voltage and the standby
outputdivider.

The reset pulse delay time t
chargetime of an externalcapacitorC

C

T

=

t

RD

2µA

, is defined by the

RD

x2V

:

T

Thereactiontimeoftheresetcircuitdependsonthe
discharge time limitation of the reset capacitor C

and is proportionalto the value of CT.
The reaction time of the reset circuitincreasesthe

noiseimmunity.In fact,ifthestandbyoutputvoltage

Figure4 :Block Diagramof the ResetCircuit.

drops below the reset thresholdfor a time shorter
thanthe reactiontimet

, noresetoutputvariation

RR

occurs. The nominal reset delay is generated for
standbyoutput voltage drops longer than the time
necessary for the complete discharging of the ca­pacitorC
C

T

. This time is typically equal to 50µsif

T

=100nF.Thetypicalresetoutputwaveformsare

shownin fig.5.
SENSECOMPARATOR

Thiscircuitcomparesaninputsignalwithan internal
voltagereferenceof typically1.23V.The useof an
externalvoltagedividermakesthecomparatorvery
flexiblein theapplication.Thisfunctioncanbeused
tosupervisetheinputvoltage-eitherbeforeor after

T

theprotectiondiode- andtogiveadditionalinforma­tiontothemicroprocessorsuchaslowvoltagewarn­ings.

7/11

L4936N/NH

Figure5 : TypicalResetOutputWaveforms.

1.5V

8/11

L4936N/NH

DIM.

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

A5

B 2.65 0.104
C 1.6 0.063
D 1 0.039

E 0.49 0.55 0.019 0.022

F 0.88 0.95 0.035 0.037
G 1.45 1.7 1.95 0.057 0.067 0.077

G1 16.75 17 17.25 0.659 0.669 0.679
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 0.87 0.886
L2 17.4 18.1 0.685
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 4.73 5.08 5.43 0.186 0.200 0.214

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

0.197

0.713

OUTLINE AND

MECHANICAL DATA

Multiwatt11 V

9/11

L4936N/NH

DIM.

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

A5

B 2.65 0.104
C 1.6 0.063

E 0.49 0.55 0.019 0.022

F 0.66 0.75 0.026 0.030
G 1.14 1.27 1.4 0.045 0.050 0.055

G1 17.57 17.78 17.91 0.692 0.700 0.705
H1 19.6 0.772
H2 20.2 0.795

L 20.57 0.810

L1 18.03
L2 2.54
L3 17.25 17.5 17.75 0.679 0.689
L4 10.3 10.7 10.9 0.406 0.421 0.429
L5 5.28 0.208
L6 2.38
L7 2.65 2.9 0.104 0.114

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

0.197

0.710

0.100

0.699

0.094

OUTLINE AND

MECHANICAL DATA

Multiwatt15 H

10/11

L4936N/NH

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