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LM2937-3.3 数据表(PDF) 3 Page - National Semiconductor (TI) |
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LM2937-3.3 数据表(HTML) 3 Page - National Semiconductor (TI) |
3 / 10 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. Input Voltage Continuous 26V Transient (t ≤ 100 ms) 60V Internal Power Dissipation (Note 2) Internally Limited Maximum Junction Temperature 150˚C Storage Temperature Range −65˚C to +150˚C Lead Temperature Soldering TO-220 (10 seconds) 260˚C TO-263 (10 seconds) 230˚C SOT-223 (Vapor Phase, 60 seconds) 215˚C SOT-223 (Infrared, 15 seconds) 220˚C ESD Susceptibility (Note 3) 2 kV Operating Conditions(Note 1) Temperature Range (Note 2) LM2937ES, LM2937ET −40˚C ≤ T A ≤ 125˚C LM2937IMP −40˚C ≤ T A ≤ 85˚C Input Voltage Range 4.75V to 26V Electrical Characteristics(Note 4) V IN = VNOM + 5V, IOUTmax = 500 mA for the TO-220 and TO-263 packages, IOUTmax=400mA for the SOT-223 package, COUT = 10 µF unless otherwise indicated. Boldface limits apply over the entire operating temperature range, of the indicated device, all other specifications are for T A = TJ = 25˚C. Output Voltage (V OUT) 2.5V 3.3V Units Parameter Conditions Typ Limit Typ Limit Output Voltage 5 mA ≤ I OUT ≤ IOUTmax 2.42 3.20 V (Min) 2.5 2.38 3.3 3.14 V(Min) 2.56 3.40 V(Max) 2.62 3.46 V(Max) Line Regulation(Note 5) 4.75V ≤ V IN ≤ 26V, 7.5 25 9.9 33 mV(Max) I OUT = 5mA Load Regulation 5 mA ≤ I OUT ≤ IOUTmax 2.5 25 3.3 33 mV(Max) Quiescent Current 7V ≤ V IN ≤ 26V, 2 10 2 10 mA(Max) I OUT = 5mA V IN = (VOUT + 5V), 10 20 10 20 mA(Max) I OUT = IOUTmax V IN = 5V, IOUT = IOUTmax 66 100125 66 100125 mA(Max) Output Noise 10 Hz–100 kHz, 75 99 µVrms Voltage I OUT = 5mA Long Term Stability 1000 Hrs. 10 13.2 mV Short-Circuit Current 1.0 0.6 1.0 0.6 A(Min) Peak Line Transient t f < 100 ms, RL = 100Ω 75 60 75 60 V(Min) Voltage Maximum Operational 26 26 V(Min) Input Voltage Reverse DC V OUT ≥ −0.6V, RL = 100Ω −30 −15 −30 −15 V(Min) Input Voltage Reverse Transient t r < 1 ms, RL = 100Ω −75 −50 −75 −50 V(Min) Input Voltage Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated Operating Conditions. Note 2: The maximum allowable power dissipation at any ambient temperature is PMAX = (125 − TA)/θJA, where 125 is the maximum junction temperature for op- eration, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125˚C and the electrical specifications do not apply. If the die temperature rises above 150˚C, the regulator will go into thermal shutdown. The junction-to-ambient thermal resistance θJA is 65˚C/W, for the TO-220 package, 73˚C/W for the TO-263 package, and 174˚C/W for the SOT-223 package. When used with a heatsink, θJA is the sum of the device junction-to-case thermal resistance θJC of 3˚C/W and the heatsink case-to-ambient thermal resistance. If the TO-263 or SOT-223 packages are used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package (see Application Hints for more information on heatsinking). Note 3: ESD rating is based on the human body model, 100 pF discharged through 1.5 k Ω. Note 4: Typicals are at TJ = 25˚C and represent the most likely parametric norm. Note 5: The minimum input voltage required for proper biasing of these regulators is 4.75V. Below this level the outputs will fall out of regulation. This effect is not the normal dropout characteristic where the output falls out of regulation due to the PNP pass transistor entering saturation. If a value for worst case effective input to output dropout voltage is required in a specification, the values should be 2.37V maximum for the LM2937-2.5 and 1.6V maximum for the LM2937-3.3. 3 www.national.com |
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