LM3435 Datasheet, PDF (1/25 Pages) Texas Instruments – Compact Sequential Mode RGB LED Driver with I2C Control Interface

LM3435
Compact Sequential Mode RGB LED Driver with I2C Control Interface
General Description
The LM3435, a Synchronously Rectified non-isolated Flyback
Converter, features all required functions to implement a high-
ly 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 MOS-
FET, 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 com-
pensation is not required resulting in a fast load transient
response. Non-overlapping RGB LEDs are driven sequential-
ly 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 chan-
nel.
The LM3435 is available in the thermally enhanced LLP-40
package.
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 2.7V - 5.5V}
● ^{Thermal shutdown}
● ^{Thermally enhanced LLP-40 package}
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}
Applications
● ^{Li-ion batteries / USB Powered RGB LED driver}
● ^{Pico / Pocket RGB LED Projector}
PRODUCTION DATA information is current as of
publication date. Products conform to specifications per
the terms of the Texas Instruments standard warranty.
Production processing does not necessarily include
testing of all parameters.
301625 SNVS724B
Copyright © 1999-2012, Texas Instruments Incorporated