Compact Sequential Mode RGB LED driver with IC Control interface
Product details
Parameters
Package | Pins | Size
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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM3435 Compact Sequential Mode RGB LED Driver with I 2 C Control Interface datasheet (Rev. C) | May 02, 2013 |
White paper | Common LED Functions and LED Driver Design Considerations | Sep. 21, 2020 | |
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 note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | May 03, 2013 | |
User guide | 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
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
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
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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