LM3435_13 Datasheet, PDF (1/27 Pages) Texas Instruments – Compact Sequential Mode RGB LED Driver with I2C Control Interface

LM3435
www.ti.com
SNVS724C – JUNE 2011 – REVISED MAY 2013
Compact Sequential Mode RGB LED Driver with I²C Control Interface
Check for Samples: LM3435
FEATURES
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•23 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
APPLICATIONS
• Li-ion Batteries/USB Powered RGB LED Driver
• Pico/Pocket RGB LED Projector
TYPICAL APPLICATION
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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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
I²C is a trademark of NXP.
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All other trademarks are the property of their respective owners.
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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.
Copyright © 2011–2013, Texas Instruments Incorporated