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 combines 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 components for efficiency or component size.

FEATURES
■ 5000:1 True Color PWM™ Dimming Ratio
■ 1.5A, 45V Internal Switch
■ 100mV High Side Current Sense
■ Open LED Protection
■ Adjustable Frequency: 250kHz 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