DESCRIPTION
The LT®3599 is a fixed frequency 2A step-up DC/DC converter designed to drive four strings of 120mA LEDs up to a 44V output voltage. The switching frequency is programmable from 200kHz to 2.1MHz through an external resistor.

FEATURES
■ True Color PWMTM Dimming Ratio Up to 3000:1
■ Drives Four Strings of LEDs at Up to 120mA
■ ±1.5% Accurate LED Current Matching
■ Wide Input Voltage Range: 3.1V to 30V
■ Output Voltage Up to 44V
■ Regulates LED Current Even When VIN > VOUT
■ Disconnects LEDs in Shutdown
■ Programmable Maximum VOUT (Regulated)
■ Open/Short LED Protection and Fault Flags
■ Programmable LED Current Derating
■ Adjustable Frequency: 200kHz to 2.1MHz
■ Synchronizable to an External Clock
■ Analog Dimming Up to 20:1
■ Programmable Input UVLO with Hysteresis
■ Thermally Enhanced 32-Pin (5mm × 5mm) QFN and 28-Pin TSSOP Packages

APPLICATIONS
■ Automotive Navigation TFT LCD Displays
■ Desktop and Notebook TFT LCD Displays