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LT3746 - 32-Channel 20mA LED Driver with Buck Controller

The LT®3746 integrates a 32-channel LED driver with a 55V buck controller. The LED driver lights up to 30mA/13V of LEDs in series per channel, and the buck controller generates an adaptive bus voltage supplying the parallel LED strings. Each channel has individual 6-bit dot correction current adjustment and 12-bit grayscale PWM dimming. Both dot correction and grayscale are accessible via a serial data interface in TTL/CMOS logic.

The LT3746 performs full diagnostic and protection against open/short LED and overtemperature fault. The fault status is sent back through the serial data interface. The 30MHz fully-buffered, skew-balanced, cascadable serial data interface makes the chip extremely suitable for large screen LCD dynamic backlighting and mono-, multi-, full-color LED displays.

Features 6V to 55V Power Input Voltage Range 32 Independent LED Outputs up to 30mA/13V 6-Bit Dot Correction Current Adjustment 12-Bit Grayscale PWM Dimming 0.5μs Minimum LED On Time Adaptive LED Bus Voltage for High Efficiency Cascadable 30MHz Serial Data Interface Full Diagnostic and Protection: Individual Open/Short LED and Overtemperature Fault Typical Application

Applications Large Screen Display LED Backlighting Mono-, Multi-, Full-Color LED Displays LED Billboards and Signboards Packaging

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