LT3746 - 32-Channel 20mA LED Driver with Buck Controller

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

Typical Application

LT3746 Typical Application

Description

The LT®3746 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-56

LT3746 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3746EUHH#PBF QFN 56 E $7.07 $4.95 View
LT3746EUHH#TRPBF QFN 56 E $5.01 View
LT3746IUHH#PBF QFN 56 I $7.79 $5.45 View
LT3746IUHH#TRPBF QFN 56 I $5.51 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1406A LT3746EUHH Demo Board: 32-Channel, 2% Accurate, 20mA LED Driver; Use DC590B as Companion Board Contact Factory
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Companion Boards

Part Number Description Price Documentation
DC590B USB Serial Controller for Linear Technology QuikEval Demo Boards $50.00
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Click here to view our complete list of demo boards

Applications

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

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Design Tools

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