DESCRIPTION
LED Driver with Integrated Schottky Diode The LT®3519/LT3519-1/LT3519-2 are fi xed frequency step-up DC/DC converters designed to drive LEDs. They feature an internal 45V, 750mA low side switch and Schottky diode. Combining 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 compensation simplifies applications.

FEATURES
■ Up to 3000:1 True Color PWM™ Dimming
■ Wide Input Voltage Range Operation from 3V to 30V Transient Protection to 40V
■ Rail-to-Rail LED Current Sense from 0V to 45V
■ 45V, 750mA Internal Switch
■ Internal Schottky Diode
■ Constant-Current and Constant-Voltage Regulation
■ Boost, SEPIC, Buck-Boost Mode or Buck Mode Topology
■ Open LED Protection and Open LED Status Pin
■ Programmable Undervoltage Lockout with Hysteresis
■ Fixed Frequency: 400kHz (LT3519), 1MHz (LT3519-1), 2.2MHz (LT3519-2)
■ Internal Compensation
■ CTRL Pin Provides Analog Dimming
■ Low Shutdown Current: <1μA
■ 16-Lead MSOP Package

APPLICATIONS
■ Automotive
■ Industrial
■ Constant Current Source
■ Current Limited Constant Voltage Source