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L4937NPD
DUAL 5V MULTIFUNCTION VOLTAGE REGULATOR
. . . . . . . . . .
STANDBYOUTPUT VOLTAGEPRECISION 5V ± 2% OUTPUT 2 TRACKED TO THE STANDBY OUTPUT 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 voltage regulators with two very low dropout outputs andadditionalfunctionssuchas power-onresetand input voltage sense. They are designed for supplying 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 2 3 4 5 6 7 8 9 10
D95AT162A
20 19 18 17 16 15 14 13 12 11
GND N.C. VO2 N.C. VO1 GND RESET N.C. N.C. GND
June 2000
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L4937NPD
BLOCK DIAGRAM
VS1
VO1
REFERENCE
1.23V REG1
VS2 EN REG2
VO2
1.23V 2µ
CT RES
RESET
2.0V
GND
D95AT163
THERMAL DATA
Symbol Rthj-case Parameter Thermal Resistance Junction-Case Max. Value 1.5 Unit °C/W
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L4937NPD
ABSOLUTE MAXIMUM RATINGS
Symbol VS Tj, Tstg IEN VEN VRES IRES PD DC Supply Voltage Transient Supply Voltage (T < 1s) Junction and Storage Temperature Range Enable Input Current (VEN ≤0.3V) Enable Input Voltage Reset Output Voltage Reset Output Current Power Dissipation Parameter Value 28 40 –55 to 150 ±1 VS 20 5 875 V mA mW Unit V V °C mA
Note : The circuit is ESD protected according to MIL–STD–883C.
APPLICATION CIRCUIT
VS1 CS
VO1 CO1
REFERENCE
1.23V REG1
VS2 EN REG2
VO2
1.23V 2µ
CT RES
CT
RESET
2.0V
GND
D95AT164
CS ≥ 1µF ; C01 ≥ 6µF ; C02 ≥ 10µF, ESR < 10Ω at 10KHz
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L4937NPD
ELECTRICAL CHARACTERISTICS (VS = 14V; –40°C ≤ TJ ≤ 125°C unless otherwise specified)
Symbol VS V O1 VO2 - VO1 Parameter Operating Supply Voltage Standby Output Voltage Output Voltage 2 Tracking Error 6V ≤ VS ≤ 25V 1mA ≤ IO1 ≤ 50mA 6V ≤ VS ≤ 25V 5mA ≤ IO2 ≤ 500mA Enable = LOW IO1 = 10mA IO1 = 50mA Vs = 4V, IO1 = 35mA 4.90 –25 5.00 Test Conditions Min. Typ. Max. 25 5.10 +25 Unit V V mV
VDP1 V IO1
Dropout Voltage 1 Input to Output Voltage Difference in Undervoltage Condition Dropout Voltage 2 Input to Output Voltage Difference in Undervoltage Condition Line Regulation Load Regulation 1 Load Regulation 2 Current Limit 1 Current Limit 2
0.1 0.2
0.25 0.4 0.4
V V V
VDP2 V IO2
IO1 = 100mA IO1 = 500mA Vs = 4.6V, IO1 = 350mA
0.2 0.3
0.3 0.6 0.6
V V V
VOL 1.2 VOLO1 VOLO2 ILIM1 ILIM2 IQSB
6V ≤ VS ≤ 25V IO1 = 1mA; IO2 = 5mA 1mA ≤ IO1 ≤ 50mA 5mA ≤ IO2 ≤ 500mA VO1 = 4.5V VO1 = 0V (note 1) VO2 = 0V 55 25 550 100 50 1000
20 25 50 200 100 1700
mV mV mV mA mA mA
Quiescent Current Standby Mode IO1 = 0.3mA; T J < 100°C (output 2 disabled) VEN ≥ 2.4V VS = 14V VS = 3.5V Quiescent Current IO1 = 50mA IO1 = 500mA
210 340
290 850 30
µA µA mA
IQ
ENABLE
VENL VENH VENhyst IEN Enable Input LOW Voltage (output 2 active) Enable Input HIGH Voltage Enable Hysteresis Enable Input Current 0V < VEN < 1.2V 2.5V < VEN < 7V –0.3 2.4 30 –10 –1 75 –1.5 0 1.5 7 200 –0.5 +1 V V mV µA µA
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L4937NPD
ELECTRICAL CHARACTERISTICS (continued) RESET
Symbol VRt VRth tRD tRR VRL ILRES VCTh VCTh, hyst Parameter Reset Low Threshold Voltage Reset Threshold Hysteresis Reset Pulse Delay Reset Reaction Time Reset Output LOW Voltage Reset Output HIGH Leakage Delay Comparator Threshold Delay Comparator Threshold Hysteresis CT = 100nF; tR > 100µs CT = 100nF RRES = 10KΩ to V01 VS = 1.5V VRES = 5V 2.0 100 Test Conditions Min. Vo1 -0.4 50 55 1 Typ. 4.7 100 100 10 Max. Vo1 -0.1 200 180 50 0.4 1 Unit V mV ms µs V µA V mV
Note : 1: Foldback characteristic
FUNCTIONAL DESCRIPTION The L4937NDis based on the SGS-THOMSON Microelectronics modular voltage regulator approach. Several out-standing features and auxiliary functions are provided to meet the requirements of supplying the microprocessor systems used in automotive applications. Furthermore the device is suitable also in other applications 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 feature 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 .