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1 L4937N DUAL MULTIFUNCTION OLTAGE REGULATOR STANDBY OUTPUT OLTAGE PRECISION 5 ± 2% OUTPUT 2 TRACKED TO THE STANDBY OUT- PUT OUTPUT 2 DISABLE FUNCTION FOR STANDBY MODE ERY LOW QUIESCENT CURRENT, LESS THAN 250µA, IN STANDBY MODE OUTPUT CURRENTS : I01 = 50mA, I02 = 500mA ERY LOW DROPOUT (max 0.4/0.6) OPERATING TRANSIENT SUPPLY OLTAGE UP TO 40 POWER-ON RESET CIRCUIT SENSING THE STANDBY OUTPUT OLTAGE. POWER-ON RESET DELAY PULSE DEFINED BY THE EXTERNAL CAPACITOR THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS PIN CONNECTION (top view) Heptawatt ORDERING NUMBER : L4937N DESCRIPTION The L4937N is a monolithic integrated dual voltage regulators with two very low dropout outputs and additional functions such as power-on reset and input voltage sense. It is designed for supplying microcomputer controlled systems specially in automotive applications. June /9
2 BLOCK DIAGRAM THERMAL DATA Symbol Parameter alue Unit R thj-case Thermal Resistance Junction-Case Max. 3 C/W 2/9
3 ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit S DC Supply oltage 28 Transient Supply oltage (T < 1s) 40 T j, T stg Junction and Storage Temperature Range 55 to 150 C I EN Enable Input Current ( EN 0.3) ± 1 ma EN Enable Input oltage S RES Reset Output oltage 20 I RES Reset Output Current 5 ma P D Power Dissipation (T A = 80 C, R th heatsink = 9 C/W) 5 W Note : The circuit is ESD protected according to MIL STD 883C. APPLICATION CIRCUIT C S 1µF ; C 01 6µF ; C 02 10µF, ESR < 10Ω at 10KHz 3/9
4 ELECTRICAL CHARACTERISTICS (S = 14; 40 C Tj 125 C unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit S Operating Supply oltage 25 O1 Standby Output oltage 6 S mA I O1 50mA O2 - O1 Output oltage 2 Tracking Error (note 1) 6 S 25 5mA I O2 500mA Enable = LOW m DP1 Dropout oltage 1 I O1 = 10mA I O1 = 50mA IO1 Input to Output oltage Difference in Undervoltage Condition S = 4, I O1 = 35mA 0.4 DP2 Dropout oltage 2 IO2 = 100mA I O2 = 500mA IO2 Input to Output oltage Difference in Undervoltage Condition S = 4.6, I O2 = 350mA 0.6 OL 1.2 Line Regulation 6 S m I O1 = 1mA; I O2 = 5mA OLO1 Load Regulation 1 1mA I O1 50mA 25 m OLO2 Load Regulation 2 5mA I O2 500mA 50 m I LIM1 Current Limit 1 O1 = 4.5 O1 = 0 (note 2) ma ma I LIM2 Current Limit 2 O2 = ma I QSB Quiescent Current Standby Mode (output 2 disabled) I O1 = 0.3mA; T J < 100 C EN 2.4 S = µa S = µa I Q Quiescent Current I O1 = 50mA I O1 = 500mA 30 ma ENABLE ENL Enable Input LOW oltage (output 2 active) ENH Enable Input HIGH oltage ENhyst Enable Hysteresis m I EN Enable Input Current 0 < EN < < EN < µa µa 4/9
5 ELECTRICAL CHARACTERISTICS (continued) RESET Symbol Parameter Test Conditions Min. Typ. Max. Unit Rt Reset Low Threshold oltage S = 14 o o1-0.1 Rth Reset Threshold Hysteresis m t RD Reset Pulse Delay C T = 100nF; t R > 100µs ms t RR Reset Reaction Time C T = 100nF µs RL Reset Output LOW oltage R RES = 10KΩ to 01 S I LRES Reset Output HIGH Leakage RES = 5 1 µa CTth Delay Comparator Threshold 2.0 CTth, hyst Delay Comparator Threshold Hysteresis 100 m Note : 1 : O2 connected to ADJ. O2 can be set to higher values by inserting an external resistor divider. 2 : Foldback characteristic FUNCTIONAL DESCRIPTION The L4937N is 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 ertical 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 2 input supply voltage. The output voltage is regulated up to the transient input supply voltage of 40. This feature avoids functional interruptions which could be generated by overvoltage pulses. The typical curve of the standby output voltage as a function of 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 shown in fig. 2 as a function of the supply input voltage 2. OUTPUT 2 OLTAGE The output 2 regulator uses the same output structure as the standby regulator, 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. The output 2 regulator can be switched off via the Enable input. 5/9
6 Figure 1 : Output oltage vs. Input oltage. Figure 2 : Quiescent Current vs. Supply oltage. RESET CIRCUIT The block circuit diagram of the reset circuit is shown in fig. 3. The reset circuit supervises the standby output voltage. The reset threshold of 4.7 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 : trd = CT x 2 2µA The reaction time of the reset circuit depends on 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 standby output 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 reset output waveforms are shown in fig. 6/9
7 Figure 3 : Block Diagram of the Reset Circuit. Figure 4 : Typical Reset Output Waveforms. OUT1 RT +0.2 RT INPUT OUT1 1.5 RESET t R t RD t RD t RR D95AT216 7/9
8 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A C D D E E F F G G G H H L L L L L L L L L M M (typ.) Dia A C L5 D1 L L1 L2 L3 D Heptawatt H3 H1 OUTLINE AND MECHANICAL DATA E M1 M F E1 E G G1 G2 L9 H2 4 Dia. L7 L4 H2 F1 F L6 HEPTAMEC 8/9
9 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 HEPTAWATT is a 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. 9/9
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