L4937 STMICROELECTRONICS [STMicroelectronics], L4937 Datasheet
L4937
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L4937 Summary of contents
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... June 2000 FOR = 500mA 02 ORDERING NUMBER : L4937N DESCRIPTION The L4937N is a monolithic integrated dual voltage regulatorswith two very low dropout outputsand ad- ditional functions such as power-on reset and input voltage sense designed for supplying micro- computer controlled systems specially in automo- tive applications. ...
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... L4937N BLOCK DIAGRAM THERMAL DATA Symbol R Thermal Resistance Junction-Case thj-case 2/9 Parameter Max. Value Unit 3 C/W ...
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... Reset Output Current RES P Power Dissipation ( Note : The circuit is ESD protected according to MIL–STD–883C. APPLICATION CIRCUIT ESR < Parameter 0.3V C/W) th heatsink at 10KHz L4937N Value Unit –55 to 150 3/9 ...
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... L4937N ELECTRICAL CHARACTERISTICS (V Symbol Parameter V Operating Supply Voltage S V Standby Output Voltage Output Voltage 2 Tracking Error O2 O1 (note 1) V Dropout Voltage 1 DP1 V Input to Output Voltage IO1 Difference in Undervoltage Condition V Dropout Voltage 2 DP2 V Input to Output Voltage IO2 Difference in Undervoltage Condition V Line Regulation OL 1 ...
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... Foldback characteristic FUNCTIONAL DESCRIPTION The L4937N is based on the SGS-THOMSON Mi- croelectronics modular voltage regulatorapproach. 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 ...
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... L4937N Figure 1 : Output Voltage vs. Input Voltage. Figure 2 : Quiescent Current vs. Supply Voltage. 400 200 RESET CIRCUIT Theblock circuit diagramof the resetcircuit is shown in fig.3. Thereset circuit supervisesthe standbyout- put voltage. The reset threshold of 4.7V is defined by the internal reference voltage and the standby output divider. ...
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... Figure 3 : Block Diagram of the Reset Circuit. Figure 4 : Typical Reset Output Waveforms. VOUT1 VRT +0.2V VRT 1.5V RESET VINPUT VOUT1 L4937N D95AT216 7/9 ...
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... L4937N mm DIM. MIN. TYP. MAX. MIN. A 4.8 C 1.37 D 2.4 2.8 0.094 D1 1.2 1.35 0.047 E 0.35 0.55 0.014 E1 0.7 0.97 0.028 F 0.6 0.8 0.024 F1 0.9 G 2.34 2.54 2.74 0.095 G1 4.88 5.08 5.28 0.193 G2 7.42 7.62 7.82 0.295 H2 10.4 H3 10.05 10.4 0.396 L 16.7 16.9 17.1 0.657 L1 14.92 L2 21.24 21.54 21.84 0.386 L3 22.27 22.52 22.77 0.877 L4 1.29 L5 2.6 2.8 3 0.102 L6 15.1 15.5 15.8 0.594 L7 6 6.35 6.6 0.236 L9 0.2 M 2.55 2.8 3.05 0.100 M1 4.83 5.08 5.33 0.190 V4 40 (typ.) Dia 3.65 3.85 0.144 Dia 8/9 inch OUTLINE AND TYP ...
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... The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – Printed in Italy – All Rights Reserved HEPTAWATT 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. Trademark of STMicroelectronics http://www.st.com L4937N 9/9 ...