LT3745-1 - 16-Channel 50mA LED Driver with Buck Controller

The LT®3745-1 integrates a 16-channel LED driver with a 55V buck controller. The LED driver lights up to 75mA/36V 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 LVDS logic. A ±4% LED current matching and a 0.5μs minimum LED on-time can be achieved at 50mA per channel.

The LT3745-1 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, cascadable LVDS serial data interface makes the chip extremely suitable for large screen LCD dynamic backlighting and mono-, multi-, full-color LED displays. The LT3745 uses a TTL/CMOS serial data interface instead of LVDS.

Features

6V to 55V Power Input Voltage Range
16 Independent LED Outputs Up to 75mA/36V
±4% LED Current Matching at 50mA (Typ ±1%)
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 LVDS Serial Data Interface
Full Diagnostic and Protection: Individual Open/Short LED and Overtemperature Fault
40-Lead 6mm × 6mm QFN Package