LT3741-1 Datasheet | Linear Technology

LT3741/LT3741-1 High Power, Constant Current, Constant Voltage, Step-Down Controller Features nn Control Pin Provides Accurate Control of Regulated Output Current nn ±1.5% Voltage Regulation Accuracy nn ±6% Current Regulation Accuracy nn 6V to 36V Input Voltage Range nn Wide Output Voltage Range Up to (VIN - 2V) nn Average Current Mode Control nn <1µA Shutdown Current nn Up to 94% Efficiency nn Additional Pin for Thermal Control of Load Current nn Thermally Enhanced 4mm × 4mm QFN and 20-Pin FE Package APPLICATIONS nn General Purpose Industrial nn Super-Cap Charging nn Applications Needing Extreme Short-Circuit Protec- tion and/or Accurate Output Current Limit nn Constant Current or Constant Voltage Source DESCRIPTION The LT®3741 and LT3741-1 are fixed frequency synchronous step-down DC/DC controllers designed to accurately regulate the output current at up to 20A. The average currentmode controller will maintain inductor current regulation over a wide output 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. If sinking current is not required, or for parallel applications, use the LT3741-1. 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 200k Hz 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. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 7199560, 7321203 and others pending. TYPICA...