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LT3741EFE-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3741EFE-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT3741 3741f Typical applicaTion DescripTion High Power, Constant Current, Constant Voltage, Step-Down Controller The LT®3741 is a fixed frequency synchronous step-down DC/DCcontrollerdesignedtoaccuratelyregulatetheoutput current at up to 20A. The average current-mode controller willmaintaininductorcurrentregulationoverawideoutput voltage range of 0V to (VIN – 2V). The regulated current is set by an analog voltage on the CTRL pins and an external sense resistor. Due to its unique topology, the LT3741 is capable of sourcing and sinking current. The regulated voltage and overvoltage protection are set with a voltage divider from the output to the FB pin. Soft-Start is provided to allow a gradual increase in the regulated current during startup. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin or through the use of the SYNC pin and an external clock signal. Additional Features include an accurate external reference voltage for use with the CTRL pins, an accurate UVLO/EN pin that allows for programmable UVLO hysteresis, and thermal shutdown. L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7199560, 7321203 and others pending. 10V/20A Constant Current, Constant Voltage Step-Down Converter FeaTures applicaTions n Control Pin Provides Accurate Control of Regulated Output Current n 1.5% Voltage Regulation Accuracy n ±6% Current Regulation Accuracy n 6V to 36V Input Voltage Range n Wide Output Voltage Range Up to (VIN – 2V) n Average Current Mode Control n <1µA Shutdown Current n Up to 94% Efficiency n Additional Pin for Thermal Control of Load Current n Thermally Enhanced 4mm × 4mm QFN and 20-Pin FE Package n General Purpose Industrial n Super-Cap Charging n Applications Needing Extreme Short-Circuit Protection and/or Accurate Output Current Limit n Constant Current or Constant Voltage Source EN/UVLO EN/UVLO HG VIN CBOOT VREF VC CTRL1 CTRL2 LT3741 RT SYNC SW LG GND SENSE+ SENSE– VCC_INT 220nF 2.2µH 22µF 2.5m FB 10nF 39.2k 5.6nF 82.5k 88.7k 3741 TA01a 12.1k 150µF 2 10nF RNTC 100µF VIN 14V TO 36V VOUT 10V 20A 1µF SS RHOT 45.3k IOUT (A) 0 2 4 6 8 10 12 14 16 18 6 8 12 10 3741 TA01b 4 2 0 22 20 VIN = 18V VOUT = 10V ILIMIT = 20A VOUT vs IOUT |
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