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LM3940IT-3.3 bảng dữ liệu(PDF) 3 Page - National Semiconductor (TI) |
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LM3940IT-3.3 bảng dữ liệu(HTML) 3 Page - National Semiconductor (TI) |
3 / 11 page Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range −65˚C to +150˚C Operating Junction Temperature Range −40˚C to +125˚C Lead Temperature (Soldering, 5 seconds) 260˚C Power Dissipation (Note 2) Internally Limited Input Supply Voltage 7.5V ESD Rating (Note 3) 2 kV Electrical Characteristics Limits in standard typeface are for T J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un- less otherwise specified: V IN = 5V, IL = 1A, COUT = 33 µF. Symbol Parameter Conditions Typical LM3940 (Note 4) Units min max V O Output Voltage 5 mA ≤ I L ≤ 1A 3.3 3.20 3.40 V 3.13 3.47 Line Regulation I L = 5mA 20 40 mV 4.5V ≤ V O ≤ 5.5V Load Regulation 50 mA ≤ I L ≤ 1A 35 50 80 Z O Output Impedance I L (DC) = 100 mA I L (AC) = 20 mA (rms) 35 m Ω f = 120 Hz I Q Quiescent Current 4.5V ≤ V IN ≤ 5.5V 10 15 mA I L = 5mA 20 V IN = 5V 110 200 I L = 1A 250 e n Output Noise Voltage BW = 10 Hz–100 kHz 150 µV (rms) I L = 5mA V O −VIN Dropout Voltage I L = 1A 0.5 0.8 V (Note 5) 1.0 I L = 100 mA 110 150 mV 200 I L(SC) Short Circuit Current R L = 0 1.7 1.2 A Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de- vice outside of its rated operating conditions. Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal resistance, θJ−A, and the ambient temperature, TA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The value of θJ−A (for devices in still air with no heatsink) is 60˚C/W for the TO-220 package, 80˚C/W for the TO-263 package, and 174˚C/W for the SOT-223 package. The effective value of θJ−A can be reduced by using a heatsink (see Application Hints for specific information on heatsinking). Note 3: ESD rating is based on the human body model: 100 pF discharged through 1.5 k Ω. Note 4: All limits guaranteed for TJ = 25˚C are 100% tested and are used to calculate Outgoing Quality Levels. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. Note 5: Dropout voltage is defined as the input-output differential voltage where the regulator output drops to a value that is 100 mV below the value that is measured at VIN = 5V. www.national.com 3 |
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