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(R)
L4936N/NH
DUAL MULTIFUNCTION VOLTAGE REGULATOR
.STANDBYOUTPUTVOLTAGEPRECI .OUTPUT2TRACKEDTOTHESTANDBYOUT.OUTPUT .VERY .OUTPUT2VOLTAGESETTABLEFROM5TO .OUTPUTCURRENTS:I .VERYLOWDROPOUT( .OPERATI .POWER.POWER.EARLYWARNI .THERMALSHUTDOWNANDSHORTCI
2% PUT SION 5V 20V PIN CONNECTION (top view)
2 DISABLE FUNCTION FOR STANDBY MODE LOW QUIESCENT CURRENT, LESS THAN 250A, IN STANDBY MODE
01 = 50mA, I02 = 500mA
Multiwatt 11
Multiwatt 15
max 0.4V/0.6V) NG TRANSIENT SUPPLY VOLTAGE UP TO 40V ON RESET CIRCUIT SENSING THE STANDBY OUTPUT VOLTAGE ON RESET DELAY PULSE DEFINED BY THE EXTERNAL CAPACITOR NG OUTPUT FOR SUPPLY UNDERVOLTAGE RCUIT PROTECTIONS
ORDERING NUMBERS: L4936N (Multiwatt 11) L4936NH (Multiwatt 15)
DESCRIPTION TheL4936N/NHare monolithic integrated dual voltage regulators with two very low dropout outputs and additionalfunctionssuchas power-onresetand input voltage sense. They are designed for supplying microcomputer controlled systems specially in automotive applications.
15 14
OUT2 ADJ OUT1 SO N.C. N.C. RES GND EN N.C. CT N.C. SI VS1 VS2
11 10 9 8 7 6 5 4 3 2 1
OUT2 ADJ OUT1 SO RES GND EN CT N.C. SI VS1/VS2
13 12 11 10 9 8 7 6 5 4 3 2 1
TAB CONNECTED TO PIN 6
D94AT154
TAB CONNECTED TO PIN 6
D95AT155
June 2000
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L4936N/NH
BLOCK DIAGRAM
VS1
VO1
REFERENCE REG1
1.23V
VS2 EN REG2
VO2
ADJ
1.23V 2
CT RES
RESET
2.0V
SI SENSE (optional) 1.23V
SO
GND
D94AT143A
THERMAL DATA
Symbol Rthj-case Parameter Thermal Resistance Junction-Case Max. Value 3 Unit C/W
Note: VS1, VS2, SI pins are rated at 1500V versus positive ESD according to human body model; o ther pins are rated at 2000V.
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L4936N/NH
ABSOLUTE MAXIMUM RATINGS
Symbol VS Tj, Tstg ISI IEN VEN VRES, V SO IRES, ISO PD DC Supply Voltage Transient Supply Voltage (T < 1s) Junction and Storage Temperature Range Sense Input Current (VSI 0.3V or VSI > VS) Enable Input Current (VEN 0.3V) Enable Input Voltage Reset and Sense Output Voltage Reset and Sense Output Current Power Dissipation (TA = 80C, R th heatsink = 11C/W) MW11 POWERDIP Parameter Value 28 40 -55 to 150 1 -1 VS 20 5 5 1166 V mA W mW Unit V V C mA mA
Note : The circuit is ESD protected according to MIL-STD-883C.
APPLICATION CIRCUIT
VS1 CS
VO1 CO1
REFERENCE
1.23V REG1 VO2
VS2 EN REG2
ADJ CO2
1.23V 2
CT RES
CT
RRES RESET SI 2.0V V O1 R SO SO SENSE (optional) 1.23V
GND
D94AT144A
CS 1F ; C01 6F ; C02 10F, ESR < 10 at 10KHz
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L4936N/NH
ELECTRICAL CHARACTERISTICS (VS = 14V; -40C unless otherwise specified)
Symbol VS V O1 VO2 - VO1 Parameter Operating Supply Voltage Standby Output Voltage Output Voltage 2 Tracking Error (note 1) ADJ Input Current 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 6V VS 25V 1mA IO1 50mA 6V VS 25V 5mA IO2 500mA Enable = LOW IO1 = 1mA; IO2 = 5mA IO1 = 10mA IO1 = 50mA VS = 4V, I O1 = 35mA 4.90 -25 5.00 Test Conditions Min. Typ. Max. 25 5.10 +25 Unit V V mV
IADJ VDP1 V IO1
-1
0.1 0.1 0.2
1 0.25 0.4 0.4
A 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 IO2 = 1mA; IO2 = 5mA 1mA IO1 50mA 5mA IO2 500mA VO1 = 4.5V VO1 = 0V (note 2) 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 < 100C (output 2 disabled) VEN 2.4V VS = 14V VS = 3.5V Quiescent Current IO1 = 50mA IO1 = 500mA
210 340
290 850 30
A A 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 A A
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L4936N/NH
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 > 100s CT = 100nF RRES = 10K to V01 VS = 1.5V VRES = 5V 2.0 100 Test Conditions VS = 14V Min. Vo1 -0.4 50 55 1 Typ. 4.7 100 100 0 Max. Vo1 -0.1 200 180 50 0.4 1 Unit V mV mV s V A V mV
SENSE
VSlth VSlth, hyst VSOL ILSO Sense Threshold Voltage Sense Threshold Hysteresis Sense Output LOW Voltage Sense Output Leakage VSI = 0.8V; V S 3V RSO = 10K to V01 VSO = 5V; VSI 1.5V 1.16 20 1.23 100 1.35 200 0.4 1 V mV V A
Note : 1 : VO2 connected to ADJ.VO2 can be set to higher values by inserting an external resistor divider. 2 : Foldback characteristic
FUNCTIONAL DESCRIPTION The L4936N/NHare basedon the SGS-THOMSON Microelectronics modular voltage regulator approach. Several out-standing features and auxiliary functions are provided to meet the requirements of supplyingthe microprocessorsystemsusedin 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 tothe transient inputsupplyvoltage of 40V.This feature avoids functional interruptions which could be generated by overvoltage pulses. 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 250A when output 2 is disabled (standby mode). The dropout voltage is controlled to reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region. The quiescent current is shownin fig. 2 as a function of the supply input voltage 2. OUTPUT 2 VOLTAGE The output 2 regulator uses the same output structure as the standbyregulator, but rated for an output current of 500mA. The output 2 regulator works in tracking mode with the standby output voltage as a reference voltage when the output 2 programming pin ADJ is connected to VO2. By connecting a resistor divider R1, R2 to the pin ADJ as shown in fig. 3, the output voltage 2 can be programmed to the value : VO2 = VO1 (1 + R1/R2) The output 2 regulator can be switched off via the Enable input.
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L4936N/NH
Figure 1 : Output Voltage vs. Input Voltage.
Figure 2 : QuiescentCurrent vs. Supply Voltage.
Figure 3 : Programmable Output 2 Voltage with External Resistors.
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L4936N/NH
RESET CIRCUIT Theblock circuit diagramoftheresetcircuit is shown in fig.4. Thereset circuit supervisesthe standbyoutput voltage. The reset threshold of 4.7V is defined by the internal reference voltage and the standby output divider. The reset pulse delay time tRD, is defined by the charge time of an external capacitor CT : CT x 2V tRD = 2A drops below the reset threshold for a time shorter than the reaction time tRR, no reset output variation occurs. The nominal reset delay is generated for standby output voltage drops longer than the time necessary for the complete discharging of the capacitor CT. This time is typically equal to 50s if CT = 100nF.The typical resetoutputwaveforms are shown in fig. 5. SENSE COMPARATOR This circuit compares aninput signalwith an internal voltage reference of typically 1.23V. The use of an external voltage divider makes the comparator very flexible in the application.This function can be used to supervisethe input voltage - either beforeor after the protectiondiode- andto give additionalinformationto the microprocessorsuch as lowvoltagewarnings.
The reaction time of the reset circuit dependson the discharge time limitation of the reset capacitor CT and is proportional to the value of CT. The reaction time of the reset circuit increases the noise immunity. In fact, if the standbyoutput voltage
Figure 4 :Block Diagram of the Reset Circuit.
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L4936N/NH
Figure 5 : Typical Reset Output Waveforms.
1.5V
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L4936N/NH
DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.4 17.25 10.3 2.65 4.25 4.73 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.88 1.45 16.75 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.43 2.6 2.6 3.85 0.862 0.854 0.685 0.679 0.406 0.104 0.167 0.186 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.87 1.7 17 1 0.55 0.95 1.95 17.25 0.019 0.035 0.057 0.659 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.214 0.102 0.102 0.152 0.067 0.669 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.037 0.077 0.679 MIN. inch TYP. MAX. 0.197 0.104 0.063
OUTLINE AND MECHANICAL DATA
Multiwatt11 V
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L4936N/NH
mm MIN. A B C E F G G1 H1 H2 L L1 L2 L3 L4 L5 L6 L7 S S1 Dia1 2.65 1.9 1.9 3.65 17.25 10.3 20.57 18.03 2.54 17.5 10.7 5.28 2.38 2.9 2.6 2.6 3.85 0.104 0.075 0.075 0.144 17.75 10.9 0.679 0.406 0.49 0.66 1.14 17.57 19.6 20.2 0.810 0.710 0.100 0.689 0.421 0.208 0.094 0.114 0.102 0.102 0.152 0.699 0.429 1.27 17.78 TYP. MAX. 5 2.65 1.6 0.55 0.75 1.4 17.91 0.019 0.026 0.045 0.692 0.772 0.795 0.050 0.700 MIN. inch TYP. MAX. 0.197 0.104 0.063 0.022 0.030 0.055 0.705
DIM.
OUTLINE AND MECHANICAL DATA
Multiwatt15 H
10/11
L4936N/NH
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2000 STMicroelectronics - Printed in Italy - All Rights Reserved MULTIWATT (R) is a Registered Trademark of STMicroelectronics STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com
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