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ADI Power by Linear LT3598

6-String 30mA LED Driver with ±1.5% Current Matching


TopologyBoost Converter
Input voltage3.2-30 V
Switching frequency200-2500 kHz
Output 144 V / 0.03 A
IC revisionB


The LT3598 is a fixed frequency step-up DC/DC converter designed to drive up to six strings of LEDs at an output voltage up to 44V. LED dimming can be achieved with analog dimming on the CTRL pin, and with pulse width modulation dimming on the PWM pin. The LT3598 accurately regulates LED current even when the input voltage is higher than the LED output voltage. The switching frequency is programmable from 200kHz to 2.5MHz through an external resistor.

Additional features include programmable overvoltage protection, switching frequency synchronization to an external clock, LED current derating based on junction temperature and/or LED temperature, LED string disable control, OPENLED alert pin and output voltage limiting when all LED strings are disconnected. The LT3598 is available in a thermally enhanced 24-lead (4mm × 4mm) QFN and 24-lead TSSOP packages.


  • True Color PWM™ Dimming Delivers Up to 3000:1 Dimming Ratio
  • Drives Six Strings of LEDs at Up to 30mA
  • ±1.5% Accurate LED Current Matching
  • Wide Input Voltage Range: 3.2V to 30V
  • Output Voltage Up to 44V
  • Regulates Current Even When VIN > VOUT
  • Disconnects LEDs in Shutdown
  • Programmable Open LED Protection (Regulated)
  • OPENLED Alert Pin
  • Programmable LED Current Derating
  • Adjustable Frequency: 200kHz to 2.5MHz
  • Synchronizable to an External Clock
  • Parallel Channels for Higher Current per LED String
  • Thermally Enhanced 4mm × 4mm QFN and 24-Lead TSSOP Packages


  • Inductor Values are Available in Page no-10

Typical applications

  • Notebook Computer Display
  • Medium Size Displays
  • Automotive LCD Display