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LT3590 - 48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN

The LT3590 is a fixed frequency buck mode converter specifically designed to drive up to 10 LEDs in series from a 48V DC source. Series connection of the LEDs provides identical LED currents of up to 50mA, resulting in uniform brightness and eliminating the need for ballast resistors. A fixed frequency, current mode architecture results in stable operation over a wide range of input voltage and output voltage.

The high switching frequency of 850kHz permits the use of tiny, low profile inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. The power switch, Schottky diode and control circuitry are all contained inside a space saving SC70 package or 2mm x 2mm DFN package to allow a small converter footprint and lower parts cost.

Features 4.5V to 55V Input Voltage Range Up to 50mA LED Current 80mA, 55V Switch Internal Schottky Diode 15µA Supply Current in Shutdown 500µA Supply Current Operating, Not Switching Switching Frequency: 850kHz 200mV Feedback Voltage with ±5% Accuracy CTRL Input Performs Dimming and Shutdown 91% Efficiency (10 LEDs, 50mA) Requires Only 1µF Output Capacitor 8-Lead SC70 Package 6-Lead 2mm × 2mm DFN Package Typical Application

Applications LED Fixed Signage Traffic Signs Neon Sign Replacement Packaging

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