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LM2745 Datenblatt(PDF) 3 Page - Texas Instruments |
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LM2745 Datenblatt(HTML) 3 Page - Texas Instruments |
3 / 37 page LM2745, LM2748 www.ti.com SNOSAL2E – APRIL 2005 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) VCC -0.3 to 7V BOOT Voltage -0.3 to 18V ISEN -0.3 to 14V FREQ/SYNC Voltage -0.5 to VCC + 0.3V All other pins -0.3 to VCC + 0.3V 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 (3) 2kV (1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device operates correctly. Operating Ratings do not imply specified performance limits. (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. (3) ESD using the human body model which is a 100pF capacitor discharged through a 1.5 k Ω resistor into each pin. Operating Ratings Supply Voltage Range, VCC (1) 3V to 6V BOOT Voltage Range 1V to 17V Junction Temperature Range (TJ) −40°C to +125°C Thermal Resistance ( θJA) 155°C/W (1) The power MOSFETs can run on a separate 1V to 14V rail (Input voltage, VIN). Practical lower limit of VIN depends on selection of the external MOSFET. See the MOSFET GATE DRIVERS section under Application Information for further details. Electrical Characteristics VCC = 3.3V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA= TJ= 25°C. Limits appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are specified by design, test, or statistical analysis. Symbol Parameter Conditions Min Typ Max Units VFB FB Pin Voltage VCC = 3V to 6V 0.591 0.6 0.609 V VON UVLO Thresholds VCC Rising 2.79 V VCC Falling 2.42 VCC = 3.3V, VSD = 3.3V LM2745 1.1 1.7 2.3 fSW = 600 kHz LM2748 1.0 1.5 2.1 Operating VCC Current mA IQ_VCC VCC = 5V, VSD = 3.3V LM2745 1.3 2 2.6 fSW = 600 kHz LM2748 1.0 1.8 2.6 Shutdown VCC Current VCC = 3.3V, VSD = 0V 1 3 µA tPWGD1 PWGD Pin Response Time VFB Rising 10 µs tPWGD2 PWGD Pin Response Time VFB Falling 10 µs ISS-ON SS Pin Source Current VSS = 0V 7 10 14 µA ISS-OC SS Pin Sink Current During Over VSS = 2.0V 90 µA Current ISEN-TH ISEN Pin Source Current Trip Point 25 40 55 µA IFB FB Pin Current Sourcing 20 nA ERROR AMPLIFIER GBW Error Amplifier Unity Gain Bandwidth 9 MHz G Error Amplifier DC Gain 118 dB SR Error Amplifier Slew Rate 2 V/µs IEAO EAO Pin Current Sourcing and 14 mA Sinking Capability 16 Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM2745 LM2748 |
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