LM3435

www.ti.com

SNVS724C – JUNE 2011 – REVISED MAY 2013

Check for Samples: LM3435

1

FEATURES

KEY SPECIFICATIONS

23

•

Sequential RGB Driving Mode

•

Support up to 2A LED current

•

Low Component Count and Small Solution

•

Typical ±3% LED current accuracy

Size

•

Integrated N-Channel main and P-Channel

•

Stable with Ceramic and Other Low ESR

synchronous MOSFETs

capacitors, No Loop Compensation Required

•

3 Integrated N-Channel current regulating pass

•

Fast Transient Response

switches

•

Programmable Converter Switching Frequency

•

up to 1 MHz

independently

•

•

Input voltage range: 2.7 – 5.5 V

•

Peak Current Limit Protection for the Switcher

•

Thermal shutdown

•

•

Thermally enhanced WQFN package

APPLICATIONS

DESCRIPTION

The LM3435, a Synchronously Rectified non-isolated

•

Li-ion Batteries/USB Powered RGB LED Driver

Flyback Converter, features all required functions to

•

Pico/Pocket RGB LED Projector

implement a highly efficient and cost effective RGB

LED driver. Different from conventional Flyback

TYPICAL APPLICATION

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.

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.

1

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.

2

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.