LT3496 Datasheet | Linear Technology

LT3496 Triple Output LED Driver Features n n n n n n n n DESCRIPTION The LT®3496 is a triple output DC/DC converter designed to operate as a constant-current source and is ideal for driving LEDs. The LT3496 works in buck, boost or buckboost mode. The LT3496 uses a fixed frequency, current mode architecture resulting in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 330k Hz and 2.1MHz to optimize efficiency and external ponent size. The LT3496 supports 3000:1 dimming control on each channel. Each of the three regulators is independently operated by that channel’s PWM signal. The PWM feature allows precise adjustment of the color mixing or dimming ratio of the LED source. Each of the three channels has a built-in gate driver to drive an external LED-disconnect P-channel MOSFET, allowing high dimming range. The output current range of each channel of the LT3496 is programmed with an external sense resistor. The CTRL pin is used to adjust the LED current either for analog dimming or overtemperature protection. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, and others pending. n n True Color PWM™ Dimming Delivers Up to 3000:1 Dimming Ratio Built-In Gate Driver for PMOS LED Disconnect Three Independent Driver Channels with 750m A, 45V Internal Switches Operates in Buck, Boost, Buck-Boost Modes CTRL Pin Accurately Sets LED Current Sense Threshold Over a Range of 10m V to 100m V Adjustable Frequency: 330k Hz to 2.1MHz Open LED Protection Wide Input Voltage Range: Operation from 3V to 30V Transient Protection to 40V Surface Mount ponents 28-Lead (4mm × 5mm) QFN and TSSOP Packages APPLICATIONS n n n n RGB Lighting Billboards and Large Displays Automotive and Avionic Lighting Constant-Current Sources .. TYPIC...