Linear Technology pushes 32-channel LED driver LT3746

Photocoupler

Linear Technology Corporation (Linear Technology Corporation) Release 32 channel LED driver LT3746, the device integrates 55V buck controller. The LED driver powers up to 30mA of LED current per channel and can drive up to 13V of series LEDs, making it ideal for applications such as large LED billboards. Each channel has a separate 6-bit correction current regulation and 12-bit grayscale PWM dimming capability. Combined with a minimum LED on-time of 0.5μs, the LT3746 offers a very wide dynamic contrast ratio. Both point correction and grayscale dimming can be done through a serial interface in TTL/CMOS logic. The LT3746 's 6V to 55V input voltage range makes the device ideal for wide input supply voltage ranges common in commercial and industrial designs, typically ranging from 12V to 48V. The combination of a minimum of external components and a 5mm x 9mm QFN package allows the LT3746 to provide a highly compact solution footprint for multi-channel LED applications.

The LT3746's internal step-down controller produces an adaptive bus voltage slightly higher than the parallel LED string to provide over 90% efficiency. 32 separate linear current sinks are used to regulate and modulate the current of individual LED strings, providing a number of features in a compact footprint solution. The LT3746 provides comprehensive diagnostics and protection against LED open/short and overtemperature faults and returns fault status via the serial data interface. The 30MHz full buffer, slew rate balanced, cascadable serial data interface makes the LT3746 ideal for dynamic backlighting of large-screen LCDs as well as full-color LED displays.

The LT3746EUHH is available in a 56-lead 5mm x 9mm QFN package and is priced at $4.95 each in 1,000-piece quantities. The Extended Temperature Grade or Tier 1 version of the LT3746IUHH is also available in 1,000-piece quantities for $5.45 each. All versions are available from stock. For more information, please visit