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LM3549

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High power sequential LED driver

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Data sheet

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NEW LP5861T ACTIVE 18-channel high-current RGB LED driver with 8-bit analog and 8-bit or 16-bit PWM dimming Newer high-current RGB LED driver with analog and PWM dimming

LM3549

ACTIVE
Data sheet Order now

Product details

Number of channels 3 LED current per channel (mA) 235 LED configuration Parallel Program memory Yes Topology Boost Programmable ramp control Yes Vin (min) (V) 2.7 Vin (max) (V) 5.5 Iout (max) (A) 0.72 Features I2C control Iq (typ) (mA) 1.6 Shutdown current (ISD) (typ) (µA) 1 Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 3 LED current per channel (mA) 235 LED configuration Parallel Program memory Yes Topology Boost Programmable ramp control Yes Vin (min) (V) 2.7 Vin (max) (V) 5.5 Iout (max) (A) 0.72 Features I2C control Iq (typ) (mA) 1.6 Shutdown current (ISD) (typ) (µA) 1 Operating temperature range (°C) -30 to 85 Rating Catalog
WQFN (RTW) 24 16 mm² 4 x 4
  • Over-Current Protection
  • Over-Temperature Protection
  • I2C Compatible Interface
  • Under-Voltage Lockout
  • LED Open and Short Protection and Detection
  • 95% Peak Efficiency Buck-Boost Converter
  • NVM Memory for Calibration Data and Standalone Usage without I2C Control
  • Soft Start

Key Specifications

  • Integrated buck-boost Converter
  • Programmable LED Drivers
  • 700 mA Maximum Drive Current
  • ±6% Current Accuracy Over Temperature
  • 24-pin WQFN Package

All trademarks are the property of their respective owners.

  • Over-Current Protection
  • Over-Temperature Protection
  • I2C Compatible Interface
  • Under-Voltage Lockout
  • LED Open and Short Protection and Detection
  • 95% Peak Efficiency Buck-Boost Converter
  • NVM Memory for Calibration Data and Standalone Usage without I2C Control
  • Soft Start

Key Specifications

  • Integrated buck-boost Converter
  • Programmable LED Drivers
  • 700 mA Maximum Drive Current
  • ±6% Current Accuracy Over Temperature
  • 24-pin WQFN Package

All trademarks are the property of their respective owners.

The LM3549 is a high power LED driver with up to 700mA output current. It has three constant current LED drivers and a buck boost SMPS for driving RGB LEDs with high efficiency. LED drivers are designed for sequential drive so only one driver can be enabled at a time.

LED driver output current settings can be stored to integrated non-volatile memory which allows stand-alone operation without I2C interface. Non-volatile memory is rewritable so current setting can be changed if needed.

The LM3549 has a fault detection feature that can detect several different fault conditions. In case of a fault error flags are set and FAULT output sends interrupt to control logic. Error flags can be read through I2C interface.

Total brightness can be controlled with PWM input or with master fader register if I2C interface is used.

The LM3549 is a high power LED driver with up to 700mA output current. It has three constant current LED drivers and a buck boost SMPS for driving RGB LEDs with high efficiency. LED drivers are designed for sequential drive so only one driver can be enabled at a time.

LED driver output current settings can be stored to integrated non-volatile memory which allows stand-alone operation without I2C interface. Non-volatile memory is rewritable so current setting can be changed if needed.

The LM3549 has a fault detection feature that can detect several different fault conditions. In case of a fault error flags are set and FAULT output sends interrupt to control logic. Error flags can be read through I2C interface.

Total brightness can be controlled with PWM input or with master fader register if I2C interface is used.

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Technical documentation

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Type Title Date
* Data sheet LM3549 High Power Sequential LED Driver datasheet (Rev. A) 03 May 2013
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note How to Select a RGB LED Driver 08 Aug 2019
User guide AN-2062 LM3549 Evaluation Kit (Rev. A) 30 Apr 2013

Design & development

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Evaluation board

LM3549SQEVNOPB — LM3549 Evaluation Module

The LM3549 is a high power LED driver with up to 700mA output current. It has three constant current LED drivers and a buck boost SMPS for driving RGB LEDs with high efficiency. LED drivers are designed for sequential drive so only one driver can be enabled at a time. LED driver output current (...)

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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