LED Driver with Integrated Schottky Diode

The LT3519/LT3519-1/LT3519-2 are fixed 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. 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.

Applications

* Automotive

* Industrial

* Constant Current Source

* Current Limited Constant Voltage Source

* 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