LT3745

PRODUCTION

16-Channel 50mA LED Driver with Buck Controller

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Overview

  • 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

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
LT3745
16-Channel 50mA LED Driver with Buck Controller
16-Channel LED Driver, 1MHz Buck, 10 LEDs, 25mA to 75mA per Channel, 500Hz 12-Bit Dimming Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters (ADCs) 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
Level Translators & Buffers 1
LTC4311
PRODUCTION Low Voltage I2C/SMBus Accelerator
Switching Regulators & Controllers 1
LT3798
PRODUCTION Isolated No Opto-Coupler Flyback Controller with Active PFC
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT3745
LTspice

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.

Evaluation Kits

eval board
schematic 1
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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Product Details

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.
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
DC1608A - Schematic

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LT3745
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