LT3497EDDB#TRMPBF

LINEAR TECHNOLOGY  LT3497EDDB#TRMPBF  发光二极管驱动器, 2输出, 升压逐步上升, 2.5V-10V输入, 2.3MHz开关, 35V/200mA输出, DFN-10

The is a dual full function step-up DC/DC Converter specifically designed to drive up to 12 white LEDs 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 and expensive factory calibration. The two independent converters are capable of driving asymmetric LED strings. Accurate LED dimming and shutdown of the two LED strings can also be controlled independently. The LT3497 features 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 1-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.

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Two independent boost converters capable of driving asymmetric LED strings

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Internal Schottky diodes

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±5% Reference accuracy

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Dual wide 250:1 True Colour PWMTM Dimming

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Requires only 1µF output capacitor per converter