LT3745
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LT3745

16-Channel 50mA LED Driver with Buck Controller

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $5.90
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
Additional Details
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The LT3745 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 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.

Applications

  • Large Screen Display LED Backlighting
  • Mono-, Multi-, Full-Color LED Displays
  • LED Billboards and Signboards
Part Models 4
1ku List Price Starting From $5.90

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3745EUJ#PBF
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LT3745EUJ#TRPBF
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LT3745IUJ#PBF
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LT3745IUJ#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1608A

LT3745 Demo Board | Three 16-Channel Buck RGB LED Drivers, Requires DC590B, 9V ≤ VIN ≤ 40V, VLED = 3.4V or 4.2V @ 50mA per Channel

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DC1608A

LT3745 Demo Board | Three 16-Channel Buck RGB LED Drivers, Requires DC590B, 9V ≤ VIN ≤ 40V, VLED = 3.4V or 4.2V @ 50mA per Channel

LT3745 Demo Board | Three 16-Channel Buck RGB LED Drivers, Requires DC590B, 9V ≤ VIN ≤ 40V, VLED = 3.4V or 4.2V @ 50mA per Channel

Product Detail

Demonstration circuit 1608A features the LT3745, a 16-channel 50mA buck LED driver controller and serial interface. Each channel drives a single LED. Three LT3745's are connected in series with each one controlling a color in a 16 LED RGD array. Each channel has an individually adjustable 12-bit (4096-step) grayscale PWM dimming control and a 6-bit (64-step) dot correction current adjustment.


The demo board input voltage range is 9V to 40V and the buck controller outputs 3.4V or 4.2V depending on the color of the LED.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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