LT3599 4-String 120mA LED Driver with 1.5% Current Matching Fea T Descrip T TM n True Color PWM Dimming Ratio Up to 3000:1 The LT 3599 is a fixed frequency 2A step-up DC/DC n Drives Four Strings of LEDs at Up to 120mA converter designed to drive four strings of 120mA LEDs n 1.5% Accurate LED Current Matching up to a 44V output voltage. The switching frequency is n Wide Input Voltage Range: 3.1V to 30V programmable from 200kHz to 2.1MHz through an ex- n Output Voltage Up to 44V ternal resistor. n Regulates LED Current Even When V > V IN OUT LED dimming can be achieved with analog dimming on n Disconnects LEDs in Shutdown the CTRL pin, and with pulse width modulation dimming n Programmable Maximum V (Regulated) OUT on the PWM pin. The LT3599 accurately regulates LED n Open/Short LED Protection and Fault Flags current even when the input voltage is higher than the n Programmable LED Current Derating LED output voltage. n Adjustable Frequency: 200kHz to 2.1MHz n Additional features include programmable LED current Synchronizable to an External Clock n derating, switching frequency synchronization to an ex- Analog Dimming Up to 20:1 n ternal clock, LED string disable control, OPENLED alert Programmable Input UVLO with Hysteresis n pin, SHORTLED alert pins and programmable maximum Thermally Enhanced 32-Pin (5mm 5mm) QFN and output voltage when all LED strings are disconnected. The 28-Pin TSSOP Packages LT3599 is available in the thermally enhanced 32-pin (5mm 5mm) QFN and 28-pin TSSOP packages. a T L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. Automotive Navigation TFT LCD Displays All other trademarks are the property of their respective owners. Protected by U.S. Patents, n Desktop and Notebook TFT LCD Displays including 7199560. Typical a T 90% Efficient 12W LED Driver PV IN 10H 8V TO 24V 4.7F V IN 3.3F 2 3.1V TO 5.5V LED Current Matching V IN V SW V IN OUT V 1.5 IN 1F V O SW ALL FOUR LED STRINGS 100k 1M 100k SHORTLED 1.0 200k OPENLED FB SHDN/UVLO 31.6k 0.5 PWM PWM 31.6k SYNC LT3599 CTRL 0 RT 33.2k V REF 53.6k 0.5 53.6k T SET 1.0 LED1 80.6k LED2 LED3 3599 TA01a 1.5 LED4 50 25 0 25 50 75 100 125 150 DISABLE4 80mA PER STRING TEMPERATURE (C) I SS GND V SET C 3599 TA01b 47nF 16.5k 100pF 10k 2.2nF 3599ff 1 For more information www.linear.com/LT3599 MATCHING (%) ion pplica ions pplica ion uresLT3599 a Te Maxi Mu M r a T (Note 1) V , SHDN/UVLO, OPENLED, SHORTLED ..................30V Operating Junction Temperature Range (Note 2) IN SHDN/UVLO Pin Above V .........................................3V LT3599E/LT3599I .............................. 40C to 125C IN SW ............................................................................45V LT3599H ............................................ 40C to 150C V , V ..............................................................45V Maximum Junction Temperature OUT O SW LED1, LED2, LED3, LED4 ..........................................45V LT3599E/LT3599I ............................................. 125C PWM, SYNC, CTRL, FB, T , DISABLE4 ....................6V LT3599H ........................................................... 150C SET V , SS .........................................................................3V Storage Temperature Range .................. 65C to 150C C V , RT, I ..............................................................2V Lead Temperature (Soldering, sec) (Note 5) .........300C REF SET p in c F T TOP VIEW TOP VIEW 1 28 V SW IN 2 27 SHDN/UVLO V OUT 3 26 NC V O SW 32 31 30 29 28 27 26 25 4 25 GND LED1 V 1 24 NC OUT 5 24 V LED2 REF V 2 23 NC O SW 6 23 SS LED3 LED1 3 22 GND 29 7 22 RT LED4 LED2 4 21 V REF 33 8 21 PWM LED3 5 20 SS DISABLE4 LED4 RT 9 20 NC 6 19 SHORTLED DISABLE4 7 18 PWM 10 19 SYNC NC SHORTLED 8 17 SYNC 11 18 NC OPENLED 9 10 11 12 13 14 15 16 12 17 T NC SET 13 16 FB I SET 14 15 V CTRL C FE PACKAGE UH PACKAGE 28-LEAD PLASTIC TSSOP 32-LEAD (5mm 5mm) PLASTIC QFN T = 150C, = 28C/W , = 10C/W T = 125C, = 34C/W JMAX JA JC JMAX JA EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3599EFE PBF LT3599EFE TRPBF LT3599FE 28-Lead Plastic TSSOP 40C to 125C LT3599IFE PBF LT3599IFE TRPBF LT3599FE 28-Lead Plastic TSSOP 40C to 125C LT3599HFE PBF LT3599HFE TRPBF LT3599FE 28-Lead Plastic TSSOP 40C to 150C LT3599EUH PBF LT3599EUH TRPBF 3599 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LT3599IUH PBF LT3599IUH TRPBF 3599 32-Lead (5mm 5mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: