Automotive pixelated dome light reference design for interior lighting
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Key Document


This reference design details a solution to drive and control 30 LEDs individually for automotive interior dome light applications. The high pixel count can be used to create different light zones or welcome light animations. The design also implements LED multiplexing functionality to control up to 150 LEDs. It uses a step-down voltage converter, a linear voltage regulator, three linear LED drivers with serial peripheral interface (SPI), and a microcontroller LaunchPad™ development kit.

  • High pixel count
  • LED multiplexing (150 LEDs)
  • CISPR25 compliant

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMR33630-Q1  3.8-V to 36-V, 3-A synchronous step-down voltage converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TLC6C5724-Q1  Automotive 24 channel Full diagnostics constant current RGB LED driver  LED drivers  Sample & Buy View Design Kits & Evaluation Modules
TPS7B82-Q1  Automotive 300-mA, off-battery (40-V), ultra-low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMR33630-Q1 Download Download
TLC6C5724-Q1 Download -
TPS7B82-Q1 Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 5604 05 Jun 2019
Design files (6)
Title Type Size (KB) Date
ZIP 305 05 Jun 2019
ZIP 1198 05 Jun 2019
PDF 329 05 Jun 2019
PDF 261 05 Jun 2019
PDF 57 05 Jun 2019
PDF 284 05 Jun 2019
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
MSP430F5529 USB LaunchPad development kit  MSP-EXP430F5529LP  Development kit 

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