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LT3599 - 4-String 120mA LED Driver with ±1.5% Current Matching

The LT3599 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.

LED dimming can be achieved with analog dimming on the CTRL pin, and with pulse width modulation dimming on the PWM pin. The LT3599 accurately regulates LED current even when the input voltage is higher than the LED output voltage.

Additional features include programmable LED current derating, switching frequency synchronization to an external clock, LED string disable control, OPENLED alert pin, SHORTLED alert pins and programmable maximum output voltage when all LED strings are disconnected. The LT3599 is available in the thermally enhanced 32-pin (5mm × 5mm) QFN and 28-pin TSSOP packages.

Features True Color PWM 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 Typical Application

Applications Automotive Navigation TFT LCD Displays Desktop and Notebook TFT LCD Displays Packaging

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