LT3746
32-Channel 20mA LED
Driver with Buck Controller
Features n n n n n n n n Description 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 Applications Large Screen Display LED Backlighting Mono-, Multi-, Full-Color LED Displays
n LED Billboards and Signboards L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners. 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. …