l4937npd STMicroelectronics, l4937npd Datasheet
l4937npd
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l4937npd Summary of contents
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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. FOR PowerSO20 = 500mA ORDERING NUMBER: L4937NPD DESCRIPTION The L4937NPD is a monolithic integrated dual volt- age regulators with two very low dropout outputs andadditionalfunctionssuchas power-onresetand input voltage sense. They are designed for supply- ing microcomputer controlled systems specially in automotive applications. ...
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... L4937NPD BLOCK DIAGRAM V S1 REFERENCE REG1 REG2 1.23V RESET THERMAL DATA Symbol Parameter R Thermal Resistance Junction-Case thj-case 2/9 1.23V 2 2.0V Value Max. 1 RES GND D95AT163 Unit C/W ...
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... Note : The circuit is ESD protected according to MIL–STD–883C. APPLICATION CIRCUIT REFERENCE 1.23V RESET ESR < Value –55 to 150 875 1.23V REG1 REG2 2 2.0V D95AT164 at 10KHz L4937NPD Unit RES GND 3/9 ...
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... L4937NPD ELECTRICAL CHARACTERISTICS (V Symbol Parameter V Operating Supply Voltage S V Standby Output Voltage Output Voltage 2 Tracking Error 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 1.2 V Load Regulation 1 ...
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... The output 2 regulator uses the same output struc- ture as the standbyregulator, but rated for an output current of 500mA. The output 2 regulatorworks in tracking mode with the standby output voltage as a reference voltage when the output 2. The output 2 regulator can be switched off via the Enable input. L4937NPD Typ. Max. Unit 4.7 V -0.1 V ...
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... L4937NPD Figure 2 : QuiescentCurrent vs. Supply Voltage. 400 200 Figure 3 : Programmable Output 2 Voltage with External Resistors. RESET CIRCUIT Theblockcircuit diagramof thereset circuit is shown in fig.4. The resetcircuit 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 4 : Block Diagram of the Reset Circuit. Figure 5 : Typical Reset Output Waveforms. VOUT1 VRT +0.2V VRT 1.5V RESET VINPUT VOUT1 L4937NPD D95AT216 7/9 ...
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... L4937NPD mm inch DIM. MIN. TYP. MAX. MIN. TYP. A 3.6 a1 0.1 0.3 0.004 a2 3 0.1 0.000 b 0.4 0.53 0.016 c 0.23 0.32 0.009 D (1) 15.8 16 0.622 D1 9.4 9.8 0.370 E 13.9 14.5 0.547 e 1.27 0.050 e3 11.43 0.450 E1 (1) 10.9 11.1 0.429 E2 2.9 E3 5.8 6.2 0.228 G 0 0.1 0.000 H 15.5 15.9 0.610 h 1.1 L 0.8 1.1 0.031 N 10 (max.) 8 (max 0.394 (1) ”D and F” do not include mold flash or protrusions. ...
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... The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – Printed in Italy – All Rights Reserved 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 L4937NPD 9/9 ...