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LM3495 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM3495 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 26 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. VIN, ILIM −0.3V to 20V SW/CSH (Note 5) −0.5V to 20V BOOST, HG −0.3V to 25V BOOST to SW −0.3V to 6V FB −0.3V to 2V TRACK, FREQ, FPWM, VLIN5, SNS, LG, CSL −0.3V to 6V Storage Temperature −65˚C to +150˚C Soldering Information Lead Temperature (soldering, 10 sec) 260˚C Infrared or Convection (15 sec) 235˚C ESD Rating (Note 2) 2kV Operating Ratings (Note 1) Supply Voltage Range (V IN) 2.9V to 18V BOOST to SW 2.5V to 5.5V Junction Temperature −40˚C to +125˚C Electrical Characteristics Specifications with standard type are for T J = 25˚C only; limits in boldface type apply over the full Operating Junction Temperature (T J) range. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T J = 25˚C, and are provided for reference purposes only. Unless otherwise indicated, V IN = 12V. Symbol Parameter Conditions Min Typ (Note 4) Max Units SYSTEM PARAMETERS V FB FB Pin Voltage -20˚C to 85˚C 0.594 0.6 0.606 V -40˚C to 125˚C 0.591 0.6 0.609 ∆V FB/VFB Line Regulation 2.9V < VIN < 18V, COMP/SD = 1.5V 0.1 % Load Regulation 1.1V < COMP/SD <1.8V 0.1 % V ON UVLO Thresholds VIN Rising 2.55 2.6 2.7 V VIN Falling 2.26 2.3 2.45 I Q Operating VIN Current COMP/SD > 0.3V Not switching 1.8 mA Quiescent Current COMP/SD < 0.3V Shutdown, VIN = 18V 33 µA I ILIM ILIM Pin Source Current 18 20 22 µA V ILIM-MAX Maximum Current Limit Sense Voltage 200 mV I SD COMP/SD Pin Pull-up current COMP/SD = 0V 2 2.6 µA V HICCUP COMP/SD Pin Hiccup Threshold 2V t DELAY Hiccup Delay 16 Cycles t COOL Cool Down Time Until Restart 4096 Cycles t SS Internal Soft start Time 400 Cycles V OVP Over Voltage Protection Threshold Asa%of nominal output voltage 116 125 132 % I FPWM FPWM Pin Pull-up Current FPWM = 0V 4.5 µA V FPWM-LO FPWM Operation Threshold FPWM Voltage Falling 0.9 V R SNS SNS Pin Input Resistance SNS = 1.5V COMP/SD > 0.3V 30 k Ω R DIS SNS Pin Discharge FET R DSON SNS = 1.5V COMP/SD = 0V 350 440 530 Ω GATE DRIVE I BOOST BOOST Pin Leakage Current BOOST - SW = 5.5V 25 nA R DS1 High-Side FET Driver Pull-up ON resistance BOOST - SW = 4.5V 4.5 Ω R DS2 High-Side FET Driver Pull-down ON resistance BOOST - SW = 4.5V 0.9 Ω www.national.com 3 |
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