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L4938NPD

STMicroelectronics
Part Number L4938NPD
Manufacturer STMicroelectronics
Description DUAL MULTIFUNCTION VOLTAGE REGULATOR
Published Mar 22, 2005
Detailed Description ® L4938N/ND L4938NPD DUAL MULTIFUNCTION VOLTAGE REGULATOR . . . . . . . . . . . . STANDBYOUTPUT VOLTAGEPRECISION 5V ±...
Datasheet PDF File L4938NPD PDF File

L4938NPD
L4938NPD

Overview
® L4938N/ND L4938NPD DUAL MULTIFUNCTION VOLTAGE REGULATOR .
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STANDBYOUTPUT VOLTAGEPRECISION 5V ± 2% OUTPUT 2 TRACKED TO THE STANDBY OUTPUT OUTPUT 2 DISABLE FUNCTION FOR STANDBY MODE VERY LOW QUIESCENT CURRENT, LESS THAN 250µA, IN STANDBY MODE OUTPUT 2 VOLTAGE SETTABLE FROM 5 TO 20V OUTPUT CURRENTS : I01 = 50mA, I02 = 500mA VERY LOW DROPOUT (max 0.
4V/0.
6V) OPERATING TRANSIENT SUPPLY VOLTAGE UP TO 40V POWER-ON RESET CIRCUIT SENSING THE STANDBY OUTPUT VOLTAGE POWER-ON RESET DELAY PULSE DEFINED BY THE EXTERNAL CAPACITOR EARLY WARNING OUTPUT FOR SUPPLY UNDERVOLTAGE THERMAL SHUTDOWN AND SHORTCIRCUIT PROTECTIONS PowerDIP (12+2+2) SO20 (12+4+4) PowerSO20 ORDERING NUMBERS: L4938N (PDIP) L4938ND (SO) L4938NPD (PSO20) DESCRIPTION The L4938N is a monolithic integrated dual voltage regulatorswith two very low dropout outputsand additional functions such as power-on reset and input voltage sense.
They are designedfor supplying microcomputer controlled systems specially in automotive applications.
PIN CONNECTION (top view) POWERDIP SO20 PowerSO20 N.
C.
1 2 3 4 5 6 7 8 9 10 D93AT004 20 19 18 17 16 15 14 13 12 11 SI VS1 VS2 GND GND GND GND VO2 VO2 ADJ N.
C.
CT EN GND GND RES SO VO1 1 2 3 4 5 6 7 8 D95AT156 16 15 14 13 12 11 10 9 SI VS1 VS2 GND GND VO2 VO2 ADJ GND N.
C.
VS2 VS1 SI N.
C.
CT EN N.
C.
GND 1 2 3 4 5 6 7 8 9 10 D95AT169A 20 19 18 17 16 15 14 13 12 11 GND N.
C.
VO2 ADJ VO1 SO RESET N.
C.
N.
C.
GND C7 EN GND GND GND GND RES SO VO1 April 1999 1/12 This is advanced information on a new product now in development or undergoing evaluation.
Details are subject to change without notice.
L4938N - L4938ND - L4938NPD BLOCK DIAGRAM VS1 VO1 REFERENCE 1.
23V REG1 VO2 VS2 EN REG2 ADJ 1.
23V 2µ CT RES RESET 2.
0V SI SENSE (optional) 1.
23V SO GND D94AT143A THERMAL DATA Symbol Rthj-case Rthj-amb Parameter Thermal Resistance Junction-Case Thermal Resistance Junction-Ambient Max.
Max.
Powerdip 14 90 PowerSO20 <2 – SO20 – 20 Unit °C/W °C/W...


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