LT3745
LT3745
PRODUCTION16-Channel 50mA LED Driver with Buck Controller
- Part Models
- 4
- 1ku List Price
- Starting From $7.47
Viewing:
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
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3745EUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT3745EUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT3745IUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT3745IUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3745EUJ#PBF | PRODUCTION | |
| LT3745EUJ#TRPBF | PRODUCTION | |
| LT3745IUJ#PBF | PRODUCTION | |
| LT3745IUJ#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| 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 |
| Temperature Sensors 1 | ||
| LTC2991 | RECOMMENDED FOR NEW DESIGNS | Octal I2C Voltage, Current, and Temperature Monitor |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT3745
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
LT3745 Demo Board | Three 16-Channel Buck RGB LED Drivers, Requires DC590B, 9V ≤ VIN ≤ 40V, VLED = 3.4V or 4.2V @ 50mA per Channel