L4936N/NH DUAL 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 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 UNDERVOLTAGE THERMAL SHUTDOWN AND SHORTCIRCUIT PROTECTIONS Multiwatt 15 Multiwatt 11 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. PIN CONNECTION (top view) TAB CONNECTED TO PIN 6 11 OUT2 10 ADJ 9 OUT1 8 SO 7 RES 6 GND 5 EN 4 CT 3 N.C. 2 SI 1 VS1/VS2 OUT2 14 ADJ 13 OUT1 12 SO 11 N.C. 10 N.C. 9 RES 8 GND 7 EN 6 N.C. 5 CT 4 N.C. 3 SI 2 VS1 1 VS2 D94AT154 TAB CONNECTED TO PIN 6 June 2000 15 D95AT155 1/11 L4936N/NH BLOCK DIAGRAM VS1 VO1 1.23V REFERENCE REG1 VO2 VS2 EN ADJ REG2 1.23V CT 2µ RES 2.0V RESET SO SI SENSE (optional) 1.23V GND D94AT143A THERMAL DATA Symbol Rthj-case Parameter Thermal Resistance Junction-Case Max. Value Unit 3 °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. 2/11 L4936N/NH ABSOLUTE MAXIMUM RATINGS Symbol VS Parameter Value Unit DC Supply Voltage 28 V Transient Supply Voltage (T < 1s) 40 V –55 to 150 °C ISI Sense Input Current (VSI ≤0.3V or VSI > VS) ±1 mA IEN Enable Input Current (VEN ≤0.3V) –1 mA VEN Enable Input Voltage VS VRES, V SO Reset and Sense Output Voltage 20 V IRES, ISO Reset and Sense Output Current 5 mA 5 1166 W mW Tj, Tstg PD Junction and Storage Temperature Range Power Dissipation (TA = 80°C, R th heatsink = 11°C/W) MW11 POWERDIP Note : The circuit is ESD protected according to MIL–STD–883C. APPLICATION CIRCUIT VS1 VO1 CS CO1 1.23V REFERENCE REG1 VO2 VS2 ADJ EN CO2 REG2 CT 1.23V CT RES 2µ RRES V O1 2.0V RESET R SO SI SO SENSE (optional) 1.23V GND D94AT144A CS ≥ 1µF ; C01 ≥ 6µF ; C02 ≥ 10µF, ESR < 10Ω at 10KHz 3/11 L4936N/NH ELECTRICAL CHARACTERISTICS (VS = 14V; –40°C unless otherwise specified) Symbol Parameter Test Conditions Min. VS Operating Supply Voltage V O1 Standby Output Voltage 6V ≤ VS ≤ 25V 1mA ≤ IO1 ≤ 50mA 4.90 Output Voltage 2 Tracking Error (note 1) 6V ≤ VS ≤ 25V 5mA ≤ IO2 ≤ 500mA Enable = LOW –25 –1 VO2 - VO1 Typ. Max. Unit 25 V 5.10 V +25 mV 0.1 1 µA 0.1 0.2 0.25 0.4 V V 0.4 V 0.3 0.6 V V 5.00 IADJ ADJ Input Current IO1 = 1mA; IO2 = 5mA VDP1 Dropout Voltage 1 IO1 = 10mA IO1 = 50mA V IO1 Input to Output Voltage Difference in Undervoltage Condition VS = 4V, I O1 = 35mA VDP2 Dropout Voltage 2 IO1 = 100mA IO1 = 500mA V IO2 Input to Output Voltage Difference in Undervoltage Condition VS = 4.6V, IO1 = 350mA 0.6 V VOL 1.2 Line Regulation 6V ≤ VS ≤ 25V IO2 = 1mA; IO2 = 5mA 20 mV VOLO1 Load Regulation 1 1mA ≤ IO1 ≤ 50mA 25 mV VOLO2 0.2 0.3 Load Regulation 2 5mA ≤ IO2 ≤ 500mA 50 mV ILIM1 Current Limit 1 VO1 = 4.5V VO1 = 0V (note 2) 55 25 100 50 200 100 mA mA ILIM2 Current Limit 2 VO2 = 0V 550 1000 1700 mA IQSB Quiescent Current Standby Mode IO1 = 0.3mA; T J < 100°C (output 2 disabled) VEN ≥ 2.4V VS = 14V VS = 3.5V 210 340 290 850 µA µA 30 mA IQ Quiescent Current IO1 = 50mA IO1 = 500mA ENABLE VENL Enable Input LOW Voltage (output 2 active) –0.3 1.5 V VENH Enable Input HIGH Voltage 2.4 7 V VENhyst IEN 4/11 Enable Hysteresis Enable Input Current 0V < VEN < 1.2V 2.5V < VEN < 7V 30 75 200 mV –10 –1 –1.5 0 –0.5 +1 µA µA L4936N/NH ELECTRICAL CHARACTERISTICS (continued) RESET Symbol Parameter VRt Reset Low Threshold Voltage VRth Reset Threshold Hysteresis Test Conditions VS = 14V Min. Typ. Max. Unit Vo1 -0.4 4.7 Vo1 -0.1 V 50 100 200 mV tRD Reset Pulse Delay CT = 100nF; tR > 100µs 55 100 180 mV tRR Reset Reaction Time CT = 100nF 1 0 50 µs VRL Reset Output LOW Voltage RRES = 10KΩ to V01 VS = 1.5V 0.4 V ILRES Reset Output HIGH Leakage VRES = 5V 1 µA VCTh Delay Comparator Threshold 2.0 V VCTh, hyst Delay Comparator Threshold Hysteresis 100 mV SENSE VSlth Sense Threshold Voltage VSlth, hyst Sense Threshold Hysteresis VSOL Sense Output LOW Voltage VSI = 0.8V; V S ≥ 3V RSO = 10KΩ to V01 ILSO Sense Output Leakage VSO = 5V; VSI ≥ 1.5V 1.16 1.23 1.35 V 20 100 200 mV 0.4 V 1 µA 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 250µA 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. 5/11 L4936N/NH Figure 1 : Output Voltage vs. Input Voltage. Figure 2 : QuiescentCurrent vs. Supply Voltage. Figure 3 : Programmable Output 2 Voltage with External Resistors. 6/11 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 = 2µA 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 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 50µs 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. Figure 4 :Block Diagram of the Reset Circuit. 7/11 L4936N/NH Figure 5 : Typical Reset Output Waveforms. 1.5V 8/11 L4936N/NH mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 D OUTLINE AND MECHANICAL DATA 0.063 1 0.039 E 0.49 0.55 0.019 F 0.88 0.95 0.035 0.022 G 1.45 1.7 1.95 0.057 0.067 0.077 G1 16.75 17 17.25 0.659 0.669 0.679 H1 19.6 0.037 0.772 H2 20.2 0.795 L 21.9 22.2 22.5 0.862 0.874 L1 21.7 22.1 22.5 0.854 0.87 L2 17.4 18.1 0.685 L3 17.25 17.5 17.75 0.679 0.689 L4 10.3 10.7 10.9 0.406 0.421 L7 2.65 2.9 0.104 0.886 0.886 0.713 0.699 0.429 0.114 M 4.25 4.55 4.85 0.167 0.179 0.191 M1 4.73 5.08 5.43 0.186 0.200 0.214 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 Multiwatt11 V 9/11 L4936N/NH mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 0.063 E 0.49 0.55 0.019 0.022 F 0.66 0.75 0.026 0.030 G 1.14 1.27 1.4 0.045 0.050 0.055 G1 17.57 17.78 17.91 0.692 0.700 0.705 H1 19.6 0.772 H2 20.2 0.795 L 20.57 0.810 L1 18.03 0.710 L2 2.54 0.100 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L5 5.28 0.208 L6 2.38 0.094 L7 2.65 2.9 0.104 0.114 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 10/11 OUTLINE AND MECHANICAL DATA Multiwatt15 H 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 2000 STMicroelectronics – Printed in Italy – All Rights Reserved MULTIWATT 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 11/11