LT3519 Datasheet | Linear Technology

LT3519/LT3519-1/LT3519-2 LED Driver with Integrated Schottky Diode Features n Up to 3000:1 True Color PWM™ Dimming n Wide Input Voltage Range Operation from 3V to 30V Transient Protection to 40V n Rail-to-Rail LED Current Sense from 0V to 45V n 45V, 750m A Internal Switch n Internal Schottky Diode n Constant-Current and Constant-Voltage Regulation n Boost, SEPIC, Buck-Boost Mode or Buck Mode Topology n Open LED Protection and Open LED Status Pin n Programmable Undervoltage Lockout with Hysteresis n Fixed Frequency: 400k Hz (LT3519), 1MHz (LT3519-1), 2.2MHz (LT3519-2) n Internal pensation n CTRL Pin Provides Analog Dimming n Low Shutdown Current: <1μA n 16-Lead MSOP Package DESCRIPTION The LT®3519/LT3519-1/LT3519-2 are fixed frequency step-up DC/DC converters designed to drive LEDs. They feature an internal 45V, 750m A low side switch and Schottky diode. bining a traditional voltage feedback and a unique rail-to-rail current sense feedback allows these converters to operate as a constant-voltage source or constant-current source. Internal pensation simplifies applications. These devices feature rail-to-rail LED current sense pins that provide the most flexibility in choosing a converter configuration to drive the LEDs. The LED current is externally programmable with a sense resistor. The external PWM provides up to 3000:1 PWM dimming and the CTRL input provides analog dimming. 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 and 7321203. APPLICATIONS n Automotive n Industrial n Constant Current Source n Current Limited Constant Voltage Source TYPICAL APPLICATION VIN 6V TO 30V 4W Boost Automotive LED Driver 68μH VOUT 1μF 100k 1M 1M 243k 137k SW ANODE CATHODE VIN ISP SHDN/UVLO VREF CTRL ISN...