LT3591 - White LED Driver With Integrated Schottky In 3mm X 2mm DFN
The LT3591 is a fixed frequency Step-up DC/DC converter speci 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 pro le 3mm 2mm DFN package.
By Linear Technology Corporation
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