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LM27966 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI) |
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LM27966 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI) |
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3 / 13 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 -0.3V to 6.0V SCL, SDIO, VIO, RESET pin voltages -0.3V to (V IN+0.3V) w/ 6.0V max I Dx Pin Voltages -0.3V to (V POUT+0.3V) w/ 6.0V max Continuous Power Dissipation (Note 3) Internally Limited Junction Temperature (T J-MAX) 150oC Storage Temperature Range -65oC to +150o C Maximum Lead Temperature (Soldering) (Note 4) ESD Rating(Note 5) Human Body Model 2.0kV Operating Rating (Notes 1, 2) Input Voltage Range 2.7V to 5.5V LED Voltage Range 2.0V to 4.0V Junction Temperature (T J) Range -30˚C to +100˚C Ambient Temperature (T A) Range(Note 6) -30˚C to +85˚C Thermal Properties Juntion-to-Ambient Thermal Resistance ( θ JA), SQA24A Package (Note 7) 41.3˚C/W ESD Caution Notice National Semiconduc- tor recommends that all integrated circuits be handled with appropriate ESD precautions. Failure to observe proper ESD handling techniques can result in damage to the device. Electrical Characteristics (Notes 2, 8) 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 = 3.6V; VRESET =VIN; VIO = 1.8V VDx = 0.4V; VDAUX = 0.4V; RSET = 16.9kΩ;Dx =DAUX = Fullscale Current; EN-MAIN, EN-D5 Bits = “1”; C1=C2=1.0µF, C IN=COUT=1.0µF; Specifications related to output current(s) and current setting pins (I Dx and ISET) apply to Main Display and Auxiliary LED. (Note 9) Symbol Parameter Condition Min Typ Max Units I Dx Output Current Regulation Main Display or Auxiliary LED Enabled 3.0V ≤ V IN ≤ 5.5V EN-AUX= ’0’ 18.2 (-9.5%) 20.1 22.0 (+9.5%) mA (%) 3.0V ≤ V IN ≤ 5.5V EN-AUX = ’1’ and EN-MAIN = EN-D5 = ’0’ 19.2 (-7.7%) 20.8 22.4 (+7.7%) mA (%) Maximum Output Current Regulation Main Display and Auxiliary LED Enabled (Note 10) 3.2V ≤ V IN ≤ 5.5V R SET = 8.33k Ω V LED = 3.6V EN-MAIN = EN-D5 = EN-AUX = “1” 30 Dx mA 30 D AUX I Dx-MATCH LED Current Matching (Note 11) 0.3 1.7 % R OUT Open-Loop Charge Pump Output Resistance Gain = 3/2 2.75 Ω Gain = 1 1 V DxTH V Dx 1x to 3/2x Gain Transition Threshold V Dx Falling RSET = 16.9k Ω 175 mV V HR Current Source Headroom Voltage Requirement (Note 12) I Dxx = 95% xIDxx (nom.) (I Dxx (nom) ≈ 15mA) Gain = 3/2 EN-MAIN = EN-D5 and/or EN-AUX= "1" 110 mV I Q Quiescent Supply Current Gain = 1.5x, No Load 2.90 3.32 mA I SD Shutdown Supply Current All EN-x bits = "0" 3.4 5.4 µA V SET I SET Pin Voltage 2.7V ≤ V IN ≤ 5.5V 1.25 V I Dx/ I SET Output Current to Current Set Ratio Main Display, DAUX 200 f SW Switching Frequency 0.89 1.27 1.57 MHz t START Start-up Time P OUT = 90% steady state 250 µs f PWM Internal Diode Current PWM Frequency 20 kHz www.national.com 3 |
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