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Analog Devices LT3745

16-Channel 50mA LED Driver with Buck Controller

Overview

TopologyBuck Converter
Input voltage10-40 V
Switching frequency200-1050 kHz
Output 14 V

Description

The LT®3745 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 TTL/CMOS logic. A ±3% LED current matching and a 0.5µs minimum LED on-time can be achieved at 50mA per channel. The LT3745 performs full diagnostic and protectionagainst 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 suitablefor large screen LCD dynamic backlighting and mono-, multi-, full-color LED displays.

Features

  • 6V to 55V Power Input Voltage Range
  • 16 Independent LED Outputs Up to 75mA/36V
  • ±3% 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 Serial Data Interface
  • Full Diagnostic and Protection: Individual Open/Short
  • LED and Overtemperature Fault
  • 40-Lead 6mm × 6mm QFN Package.

Typical applications

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

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