Power
Quad LED Driver Drives up to 32 1A LEDs
Linear Technology has announced the LT3476, a 2MHz DC/DC converter designed to operate as a four channel constant current LED driver. Each channel of the LT3476 can drive up to eight 1A LEDs in series, enabling the LT3476 to drive up to 32 1A LEDs while delivering efficiencies up to 96%. Each of the four channels is operated by an independent True Color PWM signal, enabling each channel to be dimmed independently to ratios as high as 1000:1.
A fiThe LT3476 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. With an external sense resistor, the user programs the output current range of each channel. Each of the 4 independent driver channels utilizes an internal 1.5A, 36V NPN switch. Other features include open LED protection and thermal limiting.
The LT3476EUHF is available from stock in a thermally enhanced 38-lead 5mm x 7mm DFN package. 1,000-piece pricing starts at $4.64 each and the device is available from stock.
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