L4938N Datasheet, PDF (1/12 Pages) STMicroelectronics – DUAL MULTIFUNCTION VOLTAGE REGULATOR

L4938N/ND
®
L4938NPD
DUAL MULTIFUNCTION VOLTAGE REGULATOR
. STANDBYOUTPUT VOLTAGEPRECISION 5V
± 2%
. OUTPUT 2 TRACKED TOTHESTANDBY OUT-
PUT
. 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 UN-
DERVOLTAGE
. 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 ad-
ditional functions such as power-on reset and input
voltage sense. They are designedfor supplying mi-
crocomputer controlled systems specially in auto-
motive applications.
PIN CONNECTION (top view)
POWERDIP
SO20
PowerSO20
N.C.
CT
EN
GND
GND
RES
SO
V_O1
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
D95AT156
SI
V_S1
V_S2
GND
GND
V_O2
V_O2
ADJ
N.C.
C7
EN
GND
GND
GND
GND
RES
SO
VO1
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D93AT004
SI
VS1
VS2
GND
GND
GND
GND
VO2
VO2
ADJ
GND
N.C.
V_S2
V_S1
SI
N.C.
CT
EN
N.C.
GND
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D95AT169A
GND
N.C.
V_O2
ADJ
V_O1
SO
RESET
N.C.
N.C.
GND
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.