LT3518 Datasheet | Linear Technology

Full-Featured LED Driver with 2.3A Switch Current Features n 3000:1 True Color PWM™ Dimming Ratio n 2.3A, 45V Internal Switch n 100m V High Side Current Sense n Open LED Protection n Adjustable Frequency: 250k Hz to 2.5MHz n Wide Input Voltage Range: Operation from 3V to 30V Transient Protection to 40V n Operates in Boost, Buck Mode and Buck-Boost Mode n Gate Driver for PMOS LED Disconnect n Constant-Current and Constant-Voltage Regulation n CTRL Pin Provides 10:1 Analog Dimming n Low Shutdown Current: <1μA n Available in (4mm × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages APPLICATIONS n Display Backlighting n Automotive and Avionic Lighting n Illumination n Scanners DESCRIPTION The LT®3518 is a current mode DC/DC converter with an internal 2.3A, 45V switch specifically designed to drive LEDs. The LT3518 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 the LT3518 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 3000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio. The LT3518 is available in the tiny footprint 16-lead QFN (4mm × 4mm) and the 16-pin TSSOP package. The LT3518 provides a plete solution for both constant-voltage and constant-current applications. L, 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. Protected by U.S. Patents, including 7199560, 7321203, 7746300. TYPICAL APPLICATION 1.5A Buck Mode LED Driver PVIN 24V VIN 3.3V 2.2μF VREF PWM 68mΩ M1 2.2μF VIN SHDN ISN...