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PDF L4937NPD Data sheet ( Hoja de datos )
| Número de pieza | L4937NPD | |
| Descripción | DUAL 5V MULTIFUNCTION VOLTAGE REGULATOR | |
| Fabricantes | STMicroelectronics | |
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® L4937NPD
DUAL 5V 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 260µA, IN STANDBY MODE
. 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
. THERMAL SHUTDOWN AND SHORTCIRCUIT
PROTECTIONS
PowerSO20
ORDERING NUMBER: L4937NPD
DESCRIPTION
The L4937NPD is a monolithic integrated dual volt-
age regulators with two very low dropout outputs
andadditionalfunctionssuchas power-onresetand
input voltage sense. They are designed for supply-
ing microcomputer controlled systems specially in
automotive applications.
PIN CONNECTION (top view)
GND
N.C.
VS
VS
GND
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
D95AT162A
GND
N.C.
VO2
N.C.
VO1
GND
RESET
N.C.
N.C.
GND
June 2000
1/9
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
L4937NPD
ELECTRICAL CHARACTERISTICS (continued)
RESET
Symbol
VRt
VRth
tRD
tRR
VRL
Parameter
Reset Low Threshold Voltage
Reset Threshold Hysteresis
Reset Pulse Delay
Reset Reaction Time
Reset Output LOW Voltage
ILRES
VCTh
VCTh, hyst
Reset Output HIGH Leakage
Delay Comparator Threshold
Delay Comparator Threshold
Hysteresis
Note : 1: Foldback characteristic
Test Conditions
CT = 100nF; tR > 100µs
CT = 100nF
RRES = 10KΩ to V01
VS = 1.5V
VRES = 5V
Min.
Vo1 -0.4
50
55
1
Typ.
4.7
100
100
10
Max.
Vo1 -0.1
200
180
50
0.4
Unit
V
mV
ms
µs
V
1 µA
2.0 V
100 mV
FUNCTIONAL DESCRIPTION
The L4937NDis based on the SGS-THOMSON Mi-
croelectronics modular voltage regulator approach.
Several out-standing features and auxiliary func-
tions are provided to meet the requirements of sup-
plying the microprocessor systems used in automo-
tive applications.
Furthermore the device is suitable also in other ap-
plications requiring two stabilized voltages.
The modular approach allows other features and
functions to be realized easily when required.
STANDBY REGULATOR
The standby regulator uses an Isolated Collector
Vertical PNP transistor as the regulating element.
This structure allows a very low dropout voltage at
currents up to 50mA. The dropout operation of the
standby regulator is maintained down to 2V input
supply voltage. The output voltage is regulated up
to the transientinput supplyvoltageof 40V.This fea-
ture avoids functional interruptions which could be
generated by overvoltage pulses.
Figure 1 : Output Voltage vs. Input Voltage.
The typical curve of the standby output voltage as a
functionof the input supply voltage is shown in fig. 1.
The current consumption of the device (quiescent
current) is less than 260µA when output 2 is dis-
abled (standby mode). The dropout voltage is con-
trolled to reduce the quiescent current peak in the
undervoltage region and to improve the transient
response in this region.
The quiescentcurrent isshown in fig. 2 as a function
of the supply input voltage 2.
OUTPUT 2 VOLTAGE
The output 2 regulator uses the same output struc-
ture as the standbyregulator, but rated for anoutput
current of 500mA.
The output 2 regulatorworks in tracking mode with
the standby output voltage as a reference voltage
when the output 2.
The output 2 regulator can be switched off via the
Enable input.
5/9
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