LT3599 Datasheet | Linear Technology

4-String 120m A LED Driver with ±1.5% Current Matching Features Description nn True Color PWMTM Dimming Ratio Up to 3000:1 nn Drives Four Strings of LEDs at Up to 120m A nn ±1.5% Accurate LED Current Matching nn Wide Input Voltage Range: 3.1V to 30V nn Output Voltage Up to 44V nn Regulates LED Current Even When VIN > VOUT nn Disconnects LEDs in Shutdown nn Programmable Maximum VOUT (Regulated) nn Open/Short LED Protection and Fault Flags nn Programmable LED Current Derating nn Adjustable Frequency: 200k Hz to 2.1MHz nn Synchronizable to an External Clock nn Analog Dimming Up to 20:1 nn Programmable Input UVLO with Hysteresis nn Thermally Enhanced 32-Pin (5mm × 5mm) QFN and 28-Pin TSSOP Packages Applications nn Automotive Navigation TFT LCD Displays nn Desktop and Notebook TFT LCD Displays The LT®3599 is a fixed frequency 2A step-up DC/DC converter designed to drive four strings of 120m A LEDs up to a 44V output voltage. The switching frequency is programmable from 200k Hz 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. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560. Typical Application PVIN 8V TO 24V 200k 3.3µF VIN VIN 3.1V TO 5.5V...