Boost, SEPIC, Buck-Boost Mode or Buck Mode Topology
Open LED Protection and Open LED Status Pin
Programmable Undervoltage Lockout with Hysteresis
Fixed Frequency: 2.2MHz (LT3519-2)
Internal Compensation
CTRL Pin Provides Analog Dimming
Low Shutdown Current: <1μA
16-Lead MSOP Package
LT3519-2 Applications
Automotive
Industrial
Constant Current Source
Current Limited Constant Voltage Source
LT3519-2 Description
The 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.
