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LM3551SD Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM3551SD Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 15 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 pin: Voltage to GND 7.5V SW pin: Voltage to GND 21V FB pin: Voltage to GND 7V V C pin: Voltage to GND 1.26V ± 0.3V SD,T/F pins: Voltage to GND 7.5V FET-T, FET-F: Voltage to GND 6V Continuous Power Dissipation (Note 3) Internally Limited Junction Temperature (T J-MAX ) 150˚C Storage Temperature Range -65˚C to +150 Maximum Lead Temperature (Soldering) (Note 4) ESD Rating(Note 5) Human Body Model 2.0kV Operating Ratings(Notes 1, 2) Input Voltage Range 2.7V to 5.5V SW Voltage Max. (Note 6) 20V Junction Temperature (T J) Range -40˚C to +110˚C Ambient Temperature (T A) Range (Note 7) -40˚C to +85˚C Thermal Properties Junction-to-Ambient Thermal Resistance ( θ JA), SDA14B Package (Note 8) 37.3˚C/W ESD Caution Notice National Semiconductor recommends that all integrated circuits be handled with appropri- ate ESD precautions. Failure to observe proper ESD handling techniques can result in damage to the device. Electrical Characteristics(Notes 2, 9) Limits in standard typeface are for T J = +25˚ C. Limits in boldface type apply over the full operating junction temperature range (-40˚C ≤ T J ≤ +110˚C). Unless otherwise noted, specifications apply to the LM3551 and LM3552 Typical Application Circuit (pg. 1) with: V IN = 3.6V, V(SD) = 0V for LM3551 and V(EN) = VIN for LM3552, ILOAD = 0A (Note 10) Symbol Parameter Conditions Min Typ Max Units I Q Quiescent Current FB = V IN (Not Switching) 1.47 2.0 mA I SD Shutdown Current V(SD) = V IN LM3551 2.55 5.0 µA V(EN) = 0V LM3552 0.1 2.3 I CL(Note 11) Switch Current Limit V IN = 3.0V(Note 12) 2.1 A V FB Feedback Voltage 1.2285 1.265 1.2915 V I FB(Note 13) Feedback Pin Bias Current 50 nA g m Error Amp Transconductance ∆I = 5µA 135 µmho A V Error Amp Voltage Gain 135 V/V D MAX Maximum Duty Cycle 92.5 % f sw Switching Frequency 0.9 1.25 1.6 MHz I SDPIN Shutdown Pin Current (LM3551) V SD = 0V 3.0 6 µA I ENPIN Enable Pin Current (LM3552) V EN = 3.6V 3.0 6 µA I T/FPIN T/F Pin Current V T/F =0V 26 nA V T/F =VIN 22 I L-SW SW Pin Leakage Current V L-SW = 20V 0.07 8 µA R DSON-SW SW Pin R DSON I SW = 0.5A 0.165 Ω I L-T FET-T Leakage Current 0.1 µA R DSON-T FET-T R DSON 0.98 Ω I L-F FET-F Leakage Current 0.1 µA R DSON-F FET-F R DSON 0.36 Ω Th SD/EN Shutdown/Enable Pin Threshold Output High 1.2 V Output Low 0.3 www.national.com 3 |
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