NCV8141 ON Semiconductor, NCV8141 Datasheet
NCV8141
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NCV8141 Summary of contents
Page 1
... Incorporating all of these features saves both cost, and board space. The NCV8141 provides a low sleep mode current as compared to the CS8141. Consult your local sales representative for a low sleep mode current version of the CS8140. ...
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... WDI CMOS compatible input lead. The Watchdog function monitors the falling edge of the incoming digital pulse train. The signal is usually generated by the system microprocessor Regulated output voltage, 5.0 V (typ). OUT NCV8141 Overvoltage Overtemperature Regulation Short Circuit Undervoltage Figure 1. Block Diagram Function is disabled when ENABLE is LOW and WDI is invalid ...
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... Thermal Shutdown Overvoltage Shutdown ENABLE Threshold HIGH LOW Input Current HIGH LOW Threshold Hysteresis 3. To observe safe operating junction temperatures, low duty cycle pulse testing is used in tests where applicable. NCV8141 Rating ) BAT Reflow (SMD styles only) (Note qJA qJC qCA ≤ ...
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... Input Voltage High Input Voltage Low Input Current Threshold Frequency f WDI 4. To observe safe operating junction temperatures, low duty cycle pulse testing is used in tests where applicable connected to RESET and V P OUT. NCV8141 (7.0 ≤ V ≤ 5.0 mA ≤ OUT Test Conditions V Increasing OUT V ...
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... Stable Region 1 0.1 C vout 0. OUTPUT CURRENT (mA) Figure 4. Output Stability -40 NCV8141 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 -40 350 400 450 500 -20 Figure 3. Dropout Voltage vs. Temperature 1000 Unstable Region 25°C -40°C 100 0.1 NOTE: At 125°C an additional area of instability occurs (0 ...
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... Line Regulation: The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques The NCV8141 is a 5.0 V Watchdog Regulator with protection circuitry and three logic control functions that allow a microprocessor to control its own power supply. The NCV8141 is designed for use in automotive, switch mode power supply post regulator, and battery powered systems ...
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... Thermal shutdown is an effective means to prevent die overheating since the power transistor is the principle heat source in the IC. REGULATOR CONTROL FUNCTIONS The NCV8141 differs from all other linear regulators in its unique combination of control features. Watchdog and ENABLE Function V is controlled by the logic functions ENABLE and OUT Watchdog (Table 1) ...
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... WDI Held Low or is too Slow after a Normal Period of Operation; ENABLE = LOW Figure 9. Timing Diagrams for Watchdog and ENABLE Functions V OUT V R(HI) V R(LO) RESET V R(LO) V R(PEAK) t POR Figure 10. Power RESET and Power Down NCV8141 Batt V Batt IN ENABLE WDI 0 V RESET OUT POR Normal Operation Batt V Batt IN ...
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... WDI lead now left to discharge through the input impedance of the enable lead (approximately 150 kW) and the enable signal disappears. The output voltage remains at 5 long as the NCV8141 continues to receive the correct watchdog signal. The microprocessor can power itself down by terminating its watchdog signal ...
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... V Switch R 1 110 0 Figure 13. Application Diagram for NCV8141. The NCV8141 Provides a 5.0 V Tightly Regulated Supply and Control Function to the Microprocessor. In this Application, the Microprocessor Controls its own Power Down Sequence (see text). NCV8141 V OUT V IN NCV8141 RESET WDI ...
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... This represents the worst case load conditions for the regulator at low temperature. NCV8141 V OUT mF* NCV8141 2.7 kW ENABLE RESET DELAY WDI GND R*** Figure 14. Application Diagram Step 4: Maintain the worst case load conditions set in in Figure 14 Step 3 and vary the input voltage until the oscillations 2 increase ...
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... Those packages with R 's less than the calculated value in Equation 2 will keep qJA the die temperature below 150°C. NCV8141 In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heatsink will be required. I ...
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... N 0.017 0.023 0.43 P 0.058 0.078 1.47 ° ° ° 0.095 0.105 2.41 U 0.256 REF 6.50 REF V 0.305 REF 7.75 REF 2.16 0.085 1.27 0.050 3.8 0.150 1 mm inches ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCV8141/D 8.53 4.57 0.91 1.40 1.68 0.25 2.79 0.58 1.98 ° 8 2.67 ...