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LM3435

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Compact Sequential Mode RGB LED driver with IC Control interface

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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

Product details

Number of channels 3 LED current per channel (mA) 2000 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Iout (max) (A) 2 Features I2C control Iq (typ) (mA) 5 Shutdown current (ISD) (typ) (µA) 8 Operating temperature range (°C) -40 to 125 Rating Catalog
Number of channels 3 LED current per channel (mA) 2000 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Iout (max) (A) 2 Features I2C control Iq (typ) (mA) 5 Shutdown current (ISD) (typ) (µA) 8 Operating temperature range (°C) -40 to 125 Rating Catalog
WQFN (RSB) 40 25 mm² 5 x 5
  • Sequential RGB Driving Mode
  • Low Component Count and Small Solution Size
  • Stable with Ceramic and Other Low ESR capacitors, No Loop Compensation Required
  • Fast Transient Response
  • Programmable Converter Switching Frequency up to 1 MHz
  • MCU Interface Ready With I2C Bus
  • Peak Current Limit Protection for the Switcher
  • LED Fault Detection and Reporting via I2C Bus

Key Specifications

  • Support up to 2A LED current
  • Typical ±3% LED current accuracy
  • Integrated N-Channel main and P-Channel synchronous MOSFETs
  • 3 Integrated N-Channel current regulating pass switches
  • LED Currents programmable via I2C bus independently
  • Input voltage range: 2.7 – 5.5 V
  • Thermal shutdown
  • Thermally enhanced WQFN package

All trademarks are the property of their respective owners.

  • Sequential RGB Driving Mode
  • Low Component Count and Small Solution Size
  • Stable with Ceramic and Other Low ESR capacitors, No Loop Compensation Required
  • Fast Transient Response
  • Programmable Converter Switching Frequency up to 1 MHz
  • MCU Interface Ready With I2C Bus
  • Peak Current Limit Protection for the Switcher
  • LED Fault Detection and Reporting via I2C Bus

Key Specifications

  • Support up to 2A LED current
  • Typical ±3% LED current accuracy
  • Integrated N-Channel main and P-Channel synchronous MOSFETs
  • 3 Integrated N-Channel current regulating pass switches
  • LED Currents programmable via I2C bus independently
  • Input voltage range: 2.7 – 5.5 V
  • Thermal shutdown
  • Thermally enhanced WQFN package

All trademarks are the property of their respective owners.

The LM3435, a Synchronously Rectified non-isolated Flyback Converter, features all required functions to implement a highly efficient and cost effective RGB LED driver. Different from conventional Flyback converter, LEDs connect across the VOUT pin and the VIN pin through internal passing elements at corresponding LED pins. Thus, voltage across LEDs can be higher than, equal to or lower than the input supply voltage.

Load current to LEDs is up to 2A with voltage across LEDs ranging from 2.0V to 4.5V. Integrated N-Channel main MOSFET, P-Channel synchronous MOSFET and three N-Channel current regulating pass switches allow low component count, thus reducing complexity and minimize board size. The LM3435 is designed to work exceptionally well with ceramic output capacitors with low output ripple voltage. Loop compensation is not required resulting in a fast load transient response. Non-overlapping RGB LEDs are driven sequentially through individual control. Output voltage hence can be optimized for different forward voltage of LEDs during the non-overlapping period. I2C interface eases the programming of the individual RGB LED current up to 1,024 levels per channel.

The LM3435 is available in the thermally enhanced 40-pin WQFN package.

The LM3435, a Synchronously Rectified non-isolated Flyback Converter, features all required functions to implement a highly efficient and cost effective RGB LED driver. Different from conventional Flyback converter, LEDs connect across the VOUT pin and the VIN pin through internal passing elements at corresponding LED pins. Thus, voltage across LEDs can be higher than, equal to or lower than the input supply voltage.

Load current to LEDs is up to 2A with voltage across LEDs ranging from 2.0V to 4.5V. Integrated N-Channel main MOSFET, P-Channel synchronous MOSFET and three N-Channel current regulating pass switches allow low component count, thus reducing complexity and minimize board size. The LM3435 is designed to work exceptionally well with ceramic output capacitors with low output ripple voltage. Loop compensation is not required resulting in a fast load transient response. Non-overlapping RGB LEDs are driven sequentially through individual control. Output voltage hence can be optimized for different forward voltage of LEDs during the non-overlapping period. I2C interface eases the programming of the individual RGB LED current up to 1,024 levels per channel.

The LM3435 is available in the thermally enhanced 40-pin WQFN package.

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Technical documentation

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Type Title Date
* Data sheet LM3435 Compact Sequential Mode RGB LED Driver with I 2 C Control Interface datasheet (Rev. C) 02 May 2013
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
User guide AN-2196 LM3435 Evaluation Board (Rev. A) 03 May 2013

Design & development

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Evaluation board

LM3435EVAL — Pico Projector LED Driver Evaluation Board

The LM3435 Evaluation Board has been designed for evaluating the performance of the device in a typical pico projector application. The end user can interface his own system to the evaluation board to test out the performance of the system. With LM3435, the system requires only single DC-DC (...)

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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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WQFN (RSB) 40 View options

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