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LT3763 - 60V High Current Step-Down LED Driver Controller

The LT3763 is a fixed frequency, synchronous, step-down DC/DC controller designed to accurately regulate output currents up to 20A. The average current mode control- ler will maintain inductor current regulation over a wide output voltage range from 0V to 55V. Output current is set by analog voltages on the CTRL pins and an external sense resistor. Voltage regulation and overvoltage protection are set with a voltage divider from the output to the FB pin. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin or with the SYNC pin and an external clock signal. Input and output current sensing provides input current limiting and an accurate measurement of these currents. The FBIN pin is provided for applications requiring a peak power tracking function.

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, a PWM driver for LED applications, output voltage fault detection, and thermal shutdown.

Features Accurately Control Input and Output Current 3000:1 True Color PWM™ Dimming ±1.5% Voltage Regulation Accuracy ±6% Current Regulation Accuracy 6V to 60V Input Voltage Range Wide Output Range Up to 55V <2µA Shutdown Current Control Pin for Thermal Control of Load Current Input and Output Current Monitor and Limit Open, Short, and C/10 Fault Detection PWM Driver Output for LED Applications Thermally Enhanced 28-Lead FE Package Typical Application

Applications High Power Architectural Lighting Automotive Lighting Aviation and Marine Strobe Lights Solar-Powered Chargers, Laser Diodes Packaging

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