LT3590 - 48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN

The LT3590 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 50mA, 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 850kHz 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 x 2mm DFN package to allow a small converter footprint and lower parts cost.

Features
  • 4.5V to 55V Input Voltage Range
  • Up to 50mA LED Current
  • 80mA, 55V Switch
  • Internal Schottky Diode
  • 15µA Supply Current in Shutdown
  • 500µA Supply Current Operating, Not Switching
  • Switching Frequency: 850kHz
  • 200mV Feedback Voltage with ±5% Accuracy
  • CTRL Input Performs Dimming and Shutdown
  • 91% Efficiency (10 LEDs, 50mA)
  • Requires Only 1µF Output Capacitor
  • 8-Lead SC70 Package
  • 6-Lead 2mm × 2mm DFN Package
Typical Application

Applications
  • LED Fixed Signage
  • Traffic Signs
  • Neon Sign Replacement
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3590EDC#PBF2x2 DFN-6E$2.00
LT3590EDC#TRMPBF2x2 DFN-6E$2.00$1.45
LT3590EDC#TRPBF2x2 DFN-6E$2.00$1.40
LT3590ESC8#PBFSC-70E$2.00
LT3590ESC8#TRMPBFSC-70E$2.00$1.45
LT3590ESC8#TRPBFSC-70E$2.00$1.40
Demo Boards
Part NumberDescriptionPrice
DC1166ALT3590EDC Demo Board | Buck Mode LED Driver, Tiny Package, 4.5V ≤ VIN ≤ 54V, VLED up to 40V @ 50mA$75.00
Datasheet
Reliability Data
LT Journal
Press Release
LTspice
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