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LM3743 Fiches technique(PDF) 3 Page - National Semiconductor (TI) |
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LM3743 Fiches technique(HTML) 3 Page - National Semiconductor (TI) |
3 / 23 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. V CC -0.3V to 6V SW to GND -0.3V to 6V Boot to GND -0.3V to 12V Boot to SW -0.3V to 6V SS/TRACK, ILIM, COMP/EN,FB to GND -0.3V to V CC Junction Temperature 150˚C Storage Temperature −65˚C to 150˚C Soldering Information Lead Temperature (soldering, 10sec) 260˚C Infrared or Convection (20sec) 235˚C ESD Rating (Note 3) + / – 2 kV Operating Ratings Supply Voltage Range, V CC (Note 2) 3.0V to 5.5V Junction Temperature Range (T J) −40˚C to +125˚C Electrical Characteristics V CC = 3.3V, COMP/EN floating unless otherwise indicated in the conditions col- umn. Limits in standard type are for T J = 25˚C only; limits in boldface type apply over the junction temperature (TJ) range of -40˚C to +125˚C. 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. Symbol Parameter Conditions Min Typ Max Units SYSTEM PARAMETERS V FB FB pin voltage in regulation 3.0V ≤ V CC ≤ 5.5V 0.786 0.8 0.814 V V UVLO UVLO thresholds Input voltage rising 2.84 3.0 V Input voltage falling 2.45 2.66 I VCC Operating V CC current f SW = 300 kHz, LM3743-300 1.5 2.5 mA Operating V CC current f SW = 1 MHz, LM3743-1000 1.8 3.0 mA Shutdown V CC current COMP/EN = 0V 6 50 µA I SS/TRACK SS/TRACK pin source current V SS/TRACK =0V 8 10.2 12.5 µA I ILIM ILIM pin source current V ILIM =0V 42.5 50 57.5 µA V ILIM Current Limit Trip Level –25 0 25 mV I COMP/EN COMP/EN pin pull-up current V COMP/EN =0V 4 µA V HS-CLIM High-side current limit threshold Measured at V CC pin with respect to SW 500 mV ERROR AMPLIFER GBW Error Amplifier Unity Gain Bandwidth 30 MHz G Error Amplifier DC Gain 90 dB SR Error Amplifier Slew Rate 6 V/ms I FB FB pin Bias Current 10 200 nA I EAO EAO pin sourcing/sinking current capability V COMP/EN = 1.5, VFB = 0.75V 1.7 mA V COMP/EN = 1.5, VFB = 0.85V -1 GATE DRIVE I SHDN-BOOT BOOT Pin Shutdown Current V BOOT-VSW = 3.3V, VCOMP/EN =0V 25 50 µA R HG-UP High Side MOSFET Driver Pull-up ON resistance V BOOT-VSW = 3.3V, IHGATE = 350mA (sourcing) 1.6 Ω R HG-DN High Side MOSFET Driver Pull-down ON resistance V BOOT-VSW = 3.3V, IHGATE = 350mA (sinking) 1 Ω R LG-UP Low Side MOSFET Driver Pull-up ON resistance V CC = 3.3V, ILGATE = 350mA (sourcing) 1.6 Ω R LG-DN Low Side MOSFET Driver Pull-down ON resistance V CC = 3.3V, ILGATE = 350mA (sinking) 1 Ω OSCILLATOR f SW Oscillator Frequency 3.0V ≤ V CC ≤ 5.5V, LM3743-300 255 300 345 kHz 3.0V ≤ V CC ≤ 5.5V, LM3743-1000 850 1000 1150 D MAX Max Duty Cycle f SW = 300 kHz, LM3743-300 85 91 % f SW = 1 MHz, LM3743-1000 69 76 www.national.com 3 |
Numéro de pièce similaire - LM3743 |
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Description similaire - LM3743 |
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