LT3519EMS#PBF

LT3519 is a fixed frequency step-up DC/DC converter 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. This device 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 upto 3000:1 PWM dimming and the CTRL input provides analogue dimming. It is used in application such as automotive, industrial, constant current source, current limited constant voltage source etc.

• VIN operating voltage range is 3V to 30V
• VIN supply current is 0.1μA typical at (SHDN/UVLO = 0V, shutdown)
• Rail-to-rail LED current sense from 0V to 45V
• 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
• Internal compensation, CTRL pin provides analogue dimming
• Fixed frequency is 400KHz typical
• Operating junction temperature is -40°C to 125°C, package style is 16-lead plastic MSOP

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