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.
Feature
- 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
(Picture: Pinout)
