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.

• 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.

• 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 (Typ) (uA)
• 8
• Operating temperature range (C)
• -40 to 125
• Rating
• Catalog

LM3435的完整型号有：LM3435SQ/NOPB、LM3435SQX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3435SQ/NOPB，工作温度：-40 to 125，封装：WQFN (RSB)-40，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3435SQ/NOPB的批量USD价格：3.252（1000+）

LM3435SQX/NOPB，工作温度：-40 to 125，封装：WQFN (RSB)-40，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3435SQX/NOPB的批量USD价格：2.71（1000+）

LM3435EVAL — Pico 投影仪 LED 驱动器评估板

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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