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LP3985IBL-2.7 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LP3985IBL-2.7 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 17 page Electrical Characteristics (Continued) Unless otherwise specified: V IN =VOUT(nom) + 0.5V, CIN = 1 µF, IOUT = 1mA, COUT = 1 µF, CBYPASS = 0.01µF. Typical values and limits appearing in standard typeface are for T J = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation, −40˚C to +125˚C. (Note 7) (Note 8) Symbol Parameter Conditions Typ Limit Units Min Max T ON Turn-On Time (Note 11) C BYPASS = 0.01 µF 200 µs e n Output Noise Voltage(Note 12) BW = 10 Hz to 100 kHz, C OUT = 1µF 30 µVrms Output Noise Density C BP = 0 230 nV/ I EN Maximum Input Current at EN V EN = 0.4 and VIN = 6.0 ±1nA V IL Maximum Low Level Input Voltage at EN V IN = 2.5 to 6.0V 0.4 V V IH Minimum High Level Input Voltage at EN V IN = 2.5 to 6.0V 1.4 V C OUT Output Capacitor Capacitance 120 µF ESR 5 500 m Ω TSD Thermal Shutdown Temperature 160 ˚C Thermal Shutdown Hysteresis 20 ˚C Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All voltages are with respect to the potential at the GND pin. Note 3: Additional information on lead temperature and pad temperature can be found in National Semiconductor Application Note (AN-1112). Note 4: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula: PD =(TJ -TA)/θJA, where TJ is the junction temperature, TA is the ambient temperature, and θ JA is the junction-to-ambient thermal resistance. The 364mW rating for SOT23-5 appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150˚C, for TJ, 70˚C for TA, and 220˚C/W for θJA. More power can be dissipated safely at ambient temperatures below 70˚C . Less power can be dissipated safely at ambient temperatures above 70˚C. The Absolute Maximum power dissipation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above 70˚C. Note 5: The human body model is 100pF discharged through 1.5k Ω resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 6: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 250mW rating for SOT23-5 appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125˚C, for TJ, 70˚C for TA, and 220˚C/W for θJA into (Note 4) above. More power can be dissipated at ambient temperatures below 70˚C . Less power can be dissipated at ambient temperatures above 70˚C. The maximum power dissipation for operation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above 70˚C. Note 7: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TJ = 25˚C or correlated using Statistical Quality Control (SQC) methods. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Note 8: The target output voltage, which is labeled VOUT(nom), is the desired voltage option. Note 9: An increase in the load current results in a slight decrease in the output voltage and vice versa. Note 10: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification does not apply for input voltages below 2.5V. Note 11: Turn-on time is time measured between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal value. Note 12: The output noise varies with output voltage option. The 30µVrms is measured with 2.5V voltage option. To calculate an approximated output noise for other options, use the equation: (30µVrms)(X)/2.5, where X is the voltage option value. 10136408 FIGURE 1. Line Transient Input Test Signal www.national.com 6 |
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