LM3435 Series

Compact Sequential Mode RGB LED driver with IC Control interface

Catalog

Compact Sequential Mode RGB LED driver with IC Control interface

Part	Internal Switch(s)	Type	Frequency	Package / Case	Current - Output / Channel	Dimming	Topology	Number of Outputs	Voltage - Supply (Max)	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Supplier Device Package
Texas Instruments LM3435SQ/NOPB		DC DC Regulator	1 MHz	40-WFQFN Exposed Pad	2 A	I2C	Flyback	3	5.5 V	150 °C	-40 °C	Surface Mount	40-WQFN (5x5)

Catalog

Compact Sequential Mode RGB LED driver with IC Control interface

Key Features

• Sequential RGB Driving ModeLow Component Count and Small Solution SizeStable with Ceramic and Other Low ESR capacitors, No Loop Compensation RequiredFast Transient ResponseProgrammable Converter Switching Frequency up to 1 MHzMCU Interface Ready With I2C BusPeak Current Limit Protection for the SwitcherLED Fault Detection and Reporting via I2C BusKey SpecificationsSupport up to 2A LED currentTypical ±3% LED current accuracyIntegrated N-Channel main and P-Channel synchronous MOSFETs3 Integrated N-Channel current regulating pass switchesLED Currents programmable via I2C bus independentlyInput voltage range: 2.7 – 5.5 VThermal shutdownThermally enhanced WQFN packageAll trademarks are the property of their respective owners.Sequential RGB Driving ModeLow Component Count and Small Solution SizeStable with Ceramic and Other Low ESR capacitors, No Loop Compensation RequiredFast Transient ResponseProgrammable Converter Switching Frequency up to 1 MHzMCU Interface Ready With I2C BusPeak Current Limit Protection for the SwitcherLED Fault Detection and Reporting via I2C BusKey SpecificationsSupport up to 2A LED currentTypical ±3% LED current accuracyIntegrated N-Channel main and P-Channel synchronous MOSFETs3 Integrated N-Channel current regulating pass switchesLED Currents programmable via I2C bus independentlyInput voltage range: 2.7 – 5.5 VThermal shutdownThermally enhanced WQFN packageAll trademarks are the property of their respective owners.

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. 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.