LT3491EDC Datasheet

PMIC - LED Drivers


The LT3491EDC is a fixed frequency step-up DC/DC converter specifically designed to drive up to six 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 2.3MHz 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 the tiny SC70 and 2mm × 2mm DFN packages. With such a high level of integration, the LT3491 provides a high efficiency LED driver solution in the smallest of spaces. LT3491EDC Features • Drives Up to Six White LEDs from a 3V Supply• High Side Sense Allows “One Wire Current Source”• Internal Schottky Diode• One Pin Dimming and Shutdown• 27V Open LED Protection• 2.3MHz Switching Frequency• ±5% Reference Accuracy• VIN Range: 2.5V to 12V• Requires Only 1µF Output Capacitor• Wide 300:1 True Color PWMTM Dimming Range• 8-Lead SC70 Package• Low Profile 6-Lead DFN Package(2mm × 2mm × 0.75mm) LT3491EDC Applications • Cellular Phones• PDAs, Handheld Computers• Digital Cameras• MP3 Players• GPS Receivers


[{"Name":"Topology","Value":"PWM, Step-Up (Boost)"},{"Name":"Type - Primary","Value":"Backlight"},{"Name":"Type - Secondary","Value":"White LED"},{"Name":"Frequency","Value":"1.8MHz ~ 2.8MHz"},{"Name":"Voltage - Supply","Value":"2.5 V ~ 12 V"},{"Name":"Operating Temperature","Value":"-40°C ~ 85°C"},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

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