SGS Thomson Microelectronics L4937N Datasheet
DUAL MULTIFUNCTIONVOLTAGE REGULATOR
.
STANDBYOUTPUTVOLTAGEPRECISION5V
± 2%
.
OUTPUT2TRACKEDTOTHESTANDBYOUTPUT
.OUTPUT 2 DISABLE FUNCTION FOR
STANDBYMODE
.VERY LOW QUIESCENT CURRENT, LESS
THAN250µA,IN STANDBYMODE
.OUTPUTCURRENTS: I
.
VERYLOW DROPOUT(max 0.4V/0.6V)
=50mA,I02=500mA
01
.OPERATINGTRANSIENTSUPPLYVOLTAGE
UP TO 40V
.POWER-ON RESET CIRCUIT SENSING THE
STANDBYOUTPUTVOLTAGE
.POWER-ONRESET DELAYPULSEDEFINED
BY THEEXTERNALCAPACITOR
.
THERMALSHUTDOWNANDSHORTCIRCUIT
PROTECTIONS
L4937N
Heptawatt
ORDERING NUMBER : L4937N
DES CRIP T ION
TheL4937Nis amonolithicintegrateddual voltage
regulatorswithtwoverylowdropoutoutputsandadditionalfunctionssuch as power-onresetand input
voltage sense. It is designed for supplying microcomputer controlled systems specially in automotiveapplications.
PIN CONNECTI ON
(top view)
June 2000
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L4937N
BLOCK DIAGRAM
THERMAL DATA
Symbol Parameter Value Unit
2/9
R
thj-case
Thermal Resistance Junction-Case Max. 3
C/W
°
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
DC Supply Voltage 28 V
S
Transient Supply Voltage (T < 1s) 40 V
T
j,Tstg
I
EN
V
EN
V
RES
I
RES
P
Note : The circuit is ESD protected according to MIL–STD–883C.
Junction and Storage Temperature Range –55 to 150
Enable Input Current (V
EN
0.3V)
≤
Enable Input Voltage V
1
±
S
Reset Output Voltage 20 V
Reset Output Current 5 mA
Power Dissipation (TA=80°C, R
D
th heatsink
=9°C/W)
5W
APP LICATIO N CIRCUIT
L4937N
C
°
mA
CS≥ 1µF;C01≥ 6µF;C02≥ 10µF, ESR < 10Ω at 10KHz
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