LT3492 Datasheet | Linear Technology

Features n n n n n n n n LT3492 Triple Output LED Driver with 3000:1 PWM Dimming DESCRIPTION The LT®3492 is a triple output DC/DC converter designed to operate as a constant-current source and is ideal for driving LEDs. The LT3492 works in buck, boost or buckboost mode. The LT3492 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 external PWM input provides 3000:1 LED dimming on each channel. 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 LT3492 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, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark 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 600m A, 60V 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 .. TYPICAL APPLICATION High Dimming Ratio Triple Output...