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LM3211 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM3211 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
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5 / 21 page  Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V IN -0.3V to 7.5V V SW Voltage -0.3V to 18V FB Voltage -0.3V to 7V V C Voltage 0.965V to 1.565V SHDN Voltage -0.3V to V IN FSLCT Voltage AGND to V IN Supply Voltage, Vs+ -0.3V to 14V Buffer Input Voltage Rail-to-Rail Buffer Output Voltage Rail-to-Rail ESD Ratings (Note 3) Human Body Model 2kV Machine Model 150V Operating Conditions Operating Temperature −40˚C to +125˚C Storage Temperature −65˚C to +150˚C Supply Voltage, V IN 2.2V to 7.5V V SW Voltage 17V Supply Gamma Buffer, Vs+ 4V to 14V Electrical Characteristics Specifications in standard type face are for T J = 25˚C and those with boldface type apply over the full Operating Tempera- ture Range (T J = −40˚C to +125˚C). Unless otherwise specified, VIN =2.2V and Vs+ = 8V. Switching Regulator Symbol Parameter Conditions Min (Note 4) Typ (Note 5) Max (Note 4) Units I Q Quiescent Current Not Switching, FSCLT = 0V 1.6 2 mA Not Switching, FSCLT = V IN 1.65 2.2 Switching, FSCLT = 0V 2.5 3 Switching, FSCLT = V IN 3.4 4 Shutdown mode 6 15 µA V FB Feedback Voltage 1.239 1.265 1.291 V %V FB/ ∆V IN Feedback Voltage Line Regulation 0.03 0.05 %/V I CL Switch Current Limit (Note 6) V IN = 2.5V, VOUT =8V 1.4 A R DSON Switch R DSON (Note 7) V IN = 2.7V 170 m Ω I B FB Pin Bias Current(Note 8) 30 90 nA V IN Input Voltage Range 2.2 7.5 V I SS Soft Start Current 5 11 15 µA T SS Internal Soft Start Ramp Time FSLCT = 0V 6.7 12 mS g m Error Amp Transconductance ∆I = 5µA 60 135 250 µmho A V Error Amp Voltage Gain 135 V/V D MAX Maximum Duty Cycle 78 85 % f S Switching Frequency FSLCT = 0V 500 600 700 kHz FSLCT = V IN 0.9 1.25 1.5 MHz I L Switch Leakage Current V SW = 17V 0.185 20 µA SHDN SHDN Threshold Output High 0.85 0.6 V Output Low 0.6 0.3 V I SHDN Shutdown Pin Current 0V ≤ SHDN ≤ V IN 0.5 1 µA UVP On Threshold 1.8 1.9 2 V Off Threshold 1.7 1.8 1.9 V Hysteresis 100 mV www.national.com 5 |
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