SGS Thomson Microelectronics L4937NPD Datasheet
DUAL5V MULTIFUNCTIONVOLTAGE REGULATOR
.STANDBYOUTPUTVOLTAGEPRECISION5V
± 2%
.
OUTPUT2TRACKEDTOTHESTANDBYOUTPUT
.
OUTPUT 2 DISABLE FUNCTION FOR
STANDBYMODE
.VERY LOW QUIESCENT CURRENT, LESS
THAN 260µA,INSTANDBYMODE
.OUTPUTCURRENTS: I
.
VERYLOWDROPOUT(max0.4V/0.6V)
=50mA,I02=500mA
01
.OPERATINGTRANSIENTSUPPLYVOLTAGE
UP TO 40V
.POWER-ON RESET CIRCUIT SENSING THE
STANDBYOUTPUTVOLTAGE
.POWER-ONRESET DELAY PULSEDEFINED
BY THE EXTERNALCAPACITOR
.
THERMALSHUTDOWNANDSHORTCIRCUIT
PROTECTIONS
L4 937N PD
PowerSO20
ORDERINGNUMBER: L4937NPD
DESCRIPTION
TheL4937NPDisa monolithicintegrateddualvoltage regulators with two very low dropout outputs
andadditionalfunctionssuchaspower-onresetand
inputvoltagesense.Theyaredesignedfor supplying microcomputer controlled systems specially in
automotiveapplications.
PI N CONNEC TIO N
(top view)
GND
N.C.
GND
N.C.
CT
EN
N.C.
GND 10
1
2
V
S
V
S
3
4
5
6
7
8
9
D95AT162A
20
19
18
17
16
15
14
13
12
11
GND
N.C.
V
O2
N.C.
V
O1
GND
RESET
N.C.
N.C.
GND
June 2000
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/9
L4937NPD
BLOCK DIAGRAM
V
V
EN
S1
S2
1.23V
REFERENCE
RESET
REG1
REG2
2µ
2.0V
1.23V
V
O1
V
O2
CT
RES
GND
D95AT163
THERMAL DATA
Symbol Parameter Value Unit
2/9
R
thj-case
ThermalResistance Junction-Case Max. 1.5
C/W
°
L4937NPD
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
T
j,Tstg
I
EN
V
EN
V
RES
I
RES
P
The circuit is ESD protected according to MIL–STD–883C.
Note :
APPLI CATI ON CI R CUIT
DC Supply Voltage 28 V
S
TransientSupply Voltage(T < 1s) 40 V
Junctionand Storage TemperatureRange –55 to 150
Enable Input Current(V
EN
0.3V)
≤
Enable Input Voltage V
1
±
S
Reset OutputVoltage 20 V
Reset OutputCurrent 5 mA
Power Dissipation 875 mW
D
°
mA
C
V
S1
C
S
REFERENCE
V
S2
EN
1.23V
RESET
REG1
REG2
2µ
CS≥ 1µF;C01≥ 6µF;C02≥ 10µF, ESR < 10Ω at 10KHz
2.0V
1.23V
D95AT164
V
O1
V
O2
CT
RES
GND
C
O1
CT
3/9
Loading...