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The L4938Nis a monolithic integrateddual voltage regulatorswith twoverylowdropoutoutputsandadditional functions such as power-on reset and input voltagesense. They are designedfor supplyingmicrocomputer controlled systems specially in automotive applications.
L4938NPD Maximum Ratings
Symbol
Parameter
Value
Unit
VS
DC Supply Voltage
28
V
Transient Supply Voltage (T < 1s)
40
V
Tj,Tstg
Junction and Storage Temperature Range
-55to150
°C
ISI
Sense Input Current (VSI0.3V or VSI>VS)
±1
mA
IEN
Enable Input Current (VEN0.3V)
±1
mA
VEN
Enable Input Voltage
VS
VRES,VSO
Reset and Sense Output Voltage
20
V
IRES,ISO
Reset and Sense Output Current
5
mA
PD
Power Dissipation
75
mW
Note : The circuit is ESD protected according to MILSTD883C
L4938NPD Features
·STANDBYOUTPUTVOLTAGEPRECISION5V ± 2% ·OUTPUT2TRACKEDTOTHESTANDBYOUT PUT ·OUTPUT 2 DISABLE FUNCTION FOR STANDBYMODE ·VERY LOW QUIESCENT CURRENT, LESS ·THAN 250mA, IN STANDBYMODE ·OUTPUT 2 VOLTAGESETTABLE FROM5 TO20V ·OUTPUTCURRENTS : I01 = 50mA, I02 = 500mA .VERY LOWDROPOUT (max 0.4V/0.6V) ·OPERATINGTRANSIENT SUPPLY VOLTAGE UP TO 40V ·POWER-ON RESET CIRCUIT SENSING THE STANDBYOUTPUT VOLTAGE ·POWER-ON RESET DELAY PULSE DEFINED BY THE EXTERNAL CAPACITOR ·EARLYWARNINGOUTPUTFORSUPPLYUN-DERVOLTAGE ·THERMALSHUTDOWNANDSHORTCIRCUIT PROTECTIONS
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