LT3746

PRODUCTION

LT3746

32-Channel 20mA LED Driver with Buck Controller

PRODUCTION

32-Channel LED Driver, 1MHz Buck, 3 LEDs 10mA to 30mA per Channel, 500Hz 12-Bit Dimming slide

32-Channel LED Driver, 1MHz Buck, 3 LEDs 10mA to 30mA per Channel, 500Hz 12-Bit Dimming

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1ku List Price Starting From $5.90

Features

6V to 55V Power Input Voltage Range
32 Independent LED Outputs up to 30mA/13V
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

Additional Details

The LT3746 integrates a 32-channel LED driver with a 55V buck controller. The LED driver lights up to 30mA/13V 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.

The LT3746 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

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $5.90

Technical Documents 3

LT3746: 32-Channel 20mA LED Driver with Buck Controller Data Sheet 04/15/2013

R548 Reliability Data 03/26/2018

DC1406A - Demo Manual 05/12/2011

Design Resources 4

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
LT3746EUHH#PBF	56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3746EUHH#TRPBF	56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3746IUHH#PBF	56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3746IUHH#TRPBF	56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3746EUHH#PBF
Pin/Package Drawing
56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3746EUHH#TRPBF
Pin/Package Drawing
56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3746IUHH#PBF
Pin/Package Drawing
56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3746IUHH#TRPBF
Pin/Package Drawing
56-Lead QFN (5mm x 9mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Companion Parts 3

Parts	Product Life Cycle	Description
Digital Temperature Sensors1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Serial Bus Buffers, Extenders, and Accelerators2
LTC4311	PRODUCTION	Low Voltage I²C/SMBus Accelerator
LTC4317	PRODUCTION	Dual I²C/SMBus Address Translator

DC1406A

LT3746EUHH Demo Board | 32-Channel 20mA LED Driver (x3 for RGB), 9V ≤ VIN ≤ 40V, VLED up to 4.2V @ 20mA

DC1406A

LT3746EUHH Demo Board | 32-Channel 20mA LED Driver (x3 for RGB), 9V ≤ VIN ≤ 40V, VLED up to 4.2V @ 20mA

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Product Detail

Demonstration circuit 1406A features three LT3746's, a 32-channel 20mA LED driver with buck controller and serial interface. The three LT3746’s are connected in series to control 32 OSRAM RGB LEDs stuffed on the demo board. Each IC drives a separate color. The demo board input voltage range is 9V to 40V and the LED output voltage is 4.2V for the blue and green LEDs, and 3V for the red LEDs.

Each channel has an individually adjustable 12-bit (4096-step) grayscale PWM dimming control and a 6-bit (64-step) dot correction current adjustment. Individual open/short LED and overtemperature flags are sent back during status read-back. The evaluation software installed in a host computer communicates with the DC1406A via the interface board DC590B, an USB serial controller.

Resources

PDF

DC1406A -Schematic