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LT3003

Part Number	LT3003
Manufacturer	Linear Technology
Description	3-Channel LED Ballaster
Published	Jul 14, 2009
Detailed Description	www.DataSheet4U.com FEATURES ■ ■ ■ ■ ■ ■ ■ ■ LT3003 3-Channel LED Ballaster with PWM DESCRIPTION The LT®3003 drives th...
Datasheet	LT3003 PDF File

Overview

www.
DataSheet4U.
com FEATURES ■ ■ ■ ■ ■ ■ ■ ■ LT3003 3-Channel LED Ballaster with PWM DESCRIPTION The LT®3003 drives three separate strings of LEDs up to 350mA/channel with 3% accurate current matching, resulting in uniform LED brightness and intensity.
This approach is superior to conventional methods of running three separate channels with external ballast resistors requiring expensive factory calibration.
The LT3003 operates in boost, buck and buck-boost mode.
A True Color PWM Dimming ratio of up to 3000:1 is achievable using a logic-level signal at the PWM pin for all modes without the need for external level-shifting circuitry.
For applications with input supply above and below the output voltage of the LED strings, the LT3003 allows the LEDs to be returned to the input supply (buck-boost mode) instead of being limited to only SEPIC solutions.
The LT3003 is ideal for high power LED driver applications such as TFT LCD backlighting and heads-up displays.
Additional overtemperature outputs allow appropriate system management for increased reliability.
The LT3003 is available in a small 10-pin MSE package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technolology Corporation.
All other trademarks are the property of their respective owners.
■ 3% LED Current Matching Up to 350mA Continuous Current per LED String Up to 3000:1 True Color PWMTM Dimming Range PWM Input Disconnects LED Strings Can Operate in Buck, Boost and Buck-Boost Modes Wide Input Range: 3V to 40V Overtemperature Outputs Works with LT1618, LT3477, LT3474, LT3475, LT3476, LTC®3783 Thermally Enhanced 10-Pin MSOP Package APPLICATIONS ■ ■ ■ ■ High Power LED Ballaster Automotive Lighting Video Cameras TFT LCD Backlighting TYPICAL APPLICATION Buck Mode LT3003 with the LT3476 PVIN 32V Efﬁciency 90 1µF 0.
1Ω 8 × 3 = 24 LEDs 350mA PER STRING 85 80 75 70 65 0.
33µF LED1 VMAX SHDN PWM DIMMING PWM GND LED2 LT3003 OT1 OT2 LED3 VI...

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