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Product details

Parameters

Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Iout (Max) (A) 2 Vout (Min) (V) 1.5 Vout (Max) (V) 4.7 Regulated outputs (#) 3 Topology Buck-Boost Dimming method Individual RGB PWM Power factor correction (Min) Operating temperature range (C) -40 to 125 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 5 Vref (V) 1.24 open-in-new Find other General lighting LED drivers

Package | Pins | Size

WQFN (RSB) 40 25 mm² 5 x 5 open-in-new Find other General lighting LED drivers

Features

  • 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

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Description

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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet LM3435 Compact Sequential Mode RGB LED Driver with I 2 C Control Interface datasheet (Rev. C) May 02, 2013
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014
Application notes AN-1656 Design Challenges of Switching LED Drivers (Rev. A) May 03, 2013
User guides AN-2196 LM3435 Evaluation Board (Rev. A) May 03, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description

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 (...)

Features
  • Supply voltage range, VIN = 2.7V to 5.5V
  • Preset LED current per channel, ILED = 1.5A
  • Minimum LED current per channel, ILED (min) = 600 mA
  • Maximum LED forward voltage drop, VLED = 3.5V @ 1.5A
  • Flyback converter switching frequency, FSW = approx. 500 kHz

Contents:

  • LM3435EVAL board
  • AN-2196 LM3435 Evaluation (...)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
WQFN (RSB) 40 View options

Ordering & quality

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