LT3590 Datasheet | Linear Technology

.. Features - - - - - - - - - - - - - LT3590 48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN DESCRIPTION The LT®3590 is a fixed frequency buck mode converter specifically designed to drive up to 10 LEDs in series from a 48V DC source. Series connection of the LEDs provides identical LED currents of up to 50m A, resulting in uniform brightness and eliminating the need for ballast resistors. A fixed frequency, current mode architecture results in stable operation over a wide range of input voltage and output voltage. The high switching frequency of 850k Hz permits the use of tiny, low profile inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. The power switch, Schottky diode and control circuitry are all contained inside a space saving SC70 package or 2mm × 2mm DFN package to allow a small converter footprint and lower parts cost. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 4.5V to 55V Input Voltage Range Up to 50m A LED Current 80m A, 55V Switch Internal Schottky Diode 15μA Supply Current in Shutdown 500μA Supply Current Operating, Not Switching Switching Frequency: 850k Hz 200m V Feedback Voltage with ±5% Accuracy CTRL Input Performs Dimming and Shutdown 91% Efficiency (10 LEDs, 50m A) Requires Only 1μF Output Capacitor 8-Lead SC70 Package 6-Lead 2mm × 2mm DFN Package APPLICATIONS - - - LED Fixed Signage Traffic Signs Neon Sign Replacement TYPICAL APPLICATION Buck Mode Driver for Ten White LEDs 1μF 50m A 4Ω VIN 48V 1μF CONTROL VIN CTRL LT3590 VREG 0.1μF GND SW 50 3590 TA01a Conversion Efficiency 100 90 EFFICIENCY (%) 80 70 60 LED 470μH 20 30 LED CURRENT (m A) 3590 TA01b 3590f .. (Note...