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LT3591 - White LED Driver with Integrated Schottky in 3mm x 2mm DFN

The LT3591 is a fixed frequency step-up DC/DC converter specifi cally designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source;” one side of the LED string can be returned to ground anywhere, allowing a simpler one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The high switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. Few external components are needed: open-LED protection and the Schottky diode are all contained inside a low profi le 3mm × 2mm DFN package.

Features Drives Up to Ten White LEDs from a 3V Supply High Side Sense Allows “One Wire Current Source” Internal Schottky Diode One Pin Dimming and Shutdown 80:1 True Color PWMTM Dimming Range 42V Open LED Protection 1MHz Switching Frequency ±5% Reference Accuracy VIN Range: 2.5V to 12V Requires Only 2.2µF Output Capacitor Low Profile 8-Lead DFN Package (3mm × 2mm × 0.75mm) Typical Application

Applications Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Packaging

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