LT3517 Datasheet | Linear Technology

.. LT3517 Full-Featured LED Driver with 1.5A Switch Current DESCRIPTION The LT®3517 is a current mode DC/DC converter with an internal 1.5A, 45V switch specifically designed to drive LEDs. The LT3517 operates as a LED driver in boost, buck mode and buck-boost mode. It bines a traditional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. Programmable switching frequency allows optimization of the external ponents for efficiency or ponent size. The switching frequency of LT3517 can be synchronized to an external clock signal. The LED current is externally programmable with a 100m V sense resistor. The external PWM input provides up to 5000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio. The LT3517 is available in the tiny footprint 16-Lead QFN (4mm × 4mm) and the16-Pin TSSOP packages. The LT3517 provides a plete solution for both constant-voltage and constant-current applications. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. Patent Pending. All other trademarks are the property of their respective owners. - Patents Pending. Features - - - - - - - - - - - - 5000:1 True Color PWMTM Dimming Ratio 1.5A, 45V Internal Switch 100m V High Side Current Sense Open LED Protection Adjustable Frequency: 250k Hz to 2.5MHz Wide Input Voltage Range: Operation from 3V to 30V Transient Protection to 40V Operates in Boost, Buck Mode and Buck-Boost Mode Gate Driver for PMOS LED Disconnect- Constant-Current and Constant-Voltage Regulation CTRL Pin Provides 10:1 Analog Dimming Low Shutdown Current: <1μA Available in (4mm × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages APPLICATIONS - - - - Display Backlighting Automotive and Avionic Lighting Illumination Scanners TYPICAL APPLICATION 1A Buck Mode LED Driver 100 PVIN 24V 100mΩ 2.2μF ISP VIN SHDN LT3517 VREF PWM CTRL PWM FB SS 50 40 0 16.9k 1MHz...