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LM2797 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI) |
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LM2797 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI) |
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3 / 14 page  Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V IN, EN, POK, BATOK pins: Voltage to Ground (Note 3) −0.3V to 5.6V Junction Temperature (T J-MAX-ABS) 150˚C Continuous Power Dissipation (Note 4) Internally Limited V OUT Short-Circuit to GND Duration (Note 4) Unlimited Storage Temperature Range −65˚C to 150˚C Lead Temperature (Soldering, 5 Sec.) 260˚C ESD Rating (Note 5) Human-body model: Machine model 2kV 200V Operating Ratings (Notes 1, 2) Input Voltage Range 2.6V to 5.5V Recommended Output Current Range 0mA to 120mA Junction Temperature Range -40˚C to 125˚C Ambient Temperature Range (Note 6) -40˚C to 85˚C Thermal Information Thermal Resistance, MSOP-8 220˚C/W Resistance, MSOP-8 Package ( θ JA) (Note 7) Electrical Characteristics (Notes 2, 8) Limits in standard typeface and typical values apply for T J =25 oC. Limits in boldface type apply over the operating junction temperature range. Unless otherwise specified: 2.6 ≤ V IN ≤ 5.5V, V(EN) = V IN,C1 =C2 = 1µF, CIN =COUT = 10µF. (Note 9) Symbol Parameter Conditions Min Typ Max Units LM2797-1.8, LM2798-1.8, LM2798-2.0 V OUT Output Voltage Tolerance 2.8V ≤ V IN ≤ 4.2V 0mA ≤ I OUT ≤ 120mA -5 +5 %of V OUT(nom) (Note 10) 4.2V < V IN ≤ 5.5V 0mA ≤ I OUT ≤ 120mA -6 +6 LM2798-1.5 V OUT Output Voltage Tolerance 2.8V ≤ V IN ≤ 4.2V 0mA ≤ I OUT ≤ 120mA -6 +6 %of V OUT(nom) (Note 10) 4.2V < V IN ≤ 5.5V 0mA ≤ I OUT ≤ 120mA -6 +6 All Output Voltage Options I Q Operating Supply Current I OUT = 0mA 35 50 µA I SD Shutdown Supply Current V(EN) = 0V 0.1 2 µA V R Output Voltage Ripple LM2798-1.8: V IN = 3.6V, IOUT = 120mA 20 mV p-p E PEAK Peak Efficiency LM2798-1.8: V IN = 3.0V, IOUT = 60mA 90 % E AVG Average Efficiency over Li-Ion Input Voltage Range (Note 11) LM2798-1.5: 3.0 ≤ V IN ≤ 4.2V, I OUT = 60mA 76 % LM2798-1.8: 3.0 ≤ V IN ≤ 4.2V, I OUT = 60mA 82 LM2798-2.0: 3.0 ≤ V IN ≤ 4.2V, I OUT = 60mA 75 t ON Turn-On Time LM2798, V IN=2.6V, IOUT=100mA, (Note 12) 400 µs LM2797, V IN=2.6V, IOUT=100mA, (Note 12) 100 f SW Switching Frequency 500 kHz I SC Short-Circuit Current V IN = 3.6, VOUT =0V 25 mA Enable Pin (EN) Characteristics V IH EN pin Logic-High Input 0.9 V IN V V IL EN pin Logic-Low Input 0 0.4 V I EN EN pin input current V EN =0V 0 nA V EN = 5.5V 30 www.national.com 3 |
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