LT3763 60V High Current Step-Down LED Driver Controller FEATURES DESCRIPTION n Accurately Control Input and Output Current The LT 3763 is a fixed frequency, synchronous, step-down n 3000:1 True Color PWM Dimming DC/DC controller designed to accurately regulate output n 1.5% Voltage Regulation Accuracy currents up to 20A. The average current mode control- n 6% Current Regulation Accuracy ler will maintain inductor current regulation over a wide n 6V to 60V Input Voltage Range output voltage range from 0V to 55V. Output current is n Wide Output Range Up to 55V set by analog voltages on the CTRL pins and an external n <2A Shutdown Current sense resistor. Voltage regulation and overvoltage protec- n Control Pin for Thermal Control of Load Current tion are set with a voltage divider from the output to the n Input and Output Current Monitor and Limit FB pin. The switching frequency is programmable from n Open, Short, and C/10 Fault Detection 200kHz to 1MHz through an external resistor on the RT n PWM Driver Output for LED Applications pin or with the SYNC pin and an external clock signal. n Thermally Enhanced 28-Lead FE Package Input and output current sensing provides input current limiting and an accurate measurement of these currents. APPLICATIONS The FBIN pin is provided for applications requiring a peak power tracking function. n High Power Architectural Lighting n Automotive Lighting Additional features include an accurate external reference n Aviation and Marine Strobe Lights voltage for use with the CTRL pins, an accurate UVLO/ n Solar-Powered Chargers, Laser Diodes EN pin that allows for programmable UVLO hysteresis, All registered trademarks and trademarks are the property of their respective owners. a PWM driver for LED applications, output voltage fault detection, and thermal shutdown. TYPICAL APPLICATION 20A, Pulse Width Modulated, Single LED Driver 2.5m V IN 10V TO 30V 100F 84.5k 1F 1k 1k 4.7F 15.4k PWM Dimming IVINP IVINN V IN EN/UVLO TG 220nF V REF V PWM OUT 2.2F BOOST 45.3k 6V, 20A MAXIMUM 1.5H 2.5m 10V/DIV LT3763 SW CTRL2 220F V SW 2 50V/DIV INTV 470k CC 47.5k 22F 10 10 I L 50k BG CTRL1 5A/DIV GND FBIN + SENSE 50 3763 TA01b 5s/DIV IVINMON 33nF 1nF SENSE 50 PWMOUT ISMON 1nF 47.5k PWM FAULT SYNC FB RT SS V C 12.1k 82.5k 10nF 59k 3763 TA01 4.7nF Rev. C 1 Document Feedback For more information www.analog.comLT3763 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , EN/UVLO, IVINP, and IVINN ...............................60V IN BG 1 28 GND + SENSE and SENSE .................................................60V INTV 2 27 BOOST CC CTRL1, CTRL2, FB, and FBIN ......................................3V V 3 26 SW IN SYNC and PWM ..........................................................6V EN/UVLO 4 25 TG INTV and FAULT.......................................................6V CC V 5 24 PWM OUT REF V , RT, and SS ............................................................3V C IVINN 6 23 GND V , IVINMON, and ISMON ........................................3V REF IVINP 7 22 PWM 29 GND SW ............................................................................60V IVINMON 8 21 SYNC BOOST ......................................................................66V FAULT 9 20 RT FBIN 10 19 ISMON BOOST-SW ..................................................................6V FB 11 18 V C Operating Junction Temperature (Notes 2, 3) + GND 12 17 SENSE LT3763E/LT3763I .............................. 40C to 125C CTRL2 13 16 SENSE LT3763H ............................................ 40C to 150C CTRL1 14 15 SS Storage Temperature Range .................. 65C to 150C FE PACKAGE Lead Temperature (Soldering, 10 sec) ...................300C 28-LEAD PLASTIC TSSOP = 30C/W JA EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3763EFE PBF LT3763EFE TRPBF LT3763FE 28-Lead Plastic TSSOP 40C to 125C LT3763IFE PBF LT3763IFE TRPBF LT3763FE 28-Lead Plastic TSSOP 40C to 125C LT3763HFE PBF LT3763HFE TRPBF LT3763FE 28-Lead Plastic TSSOP 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at T = 25C. V = 12V, V = 5V unless otherwise noted. A IN EN/UVLO PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range 6 60 V Supply Undervoltage Lockout From Low to High 3.75 4.0 4.25 V V Pin Quiescent Current IN Non-Switching Operation V = 1.4V, Not Switching 1.7 3.5 mA EN/UVLO Shutdown Mode V = 0V 0.2 2 A EN/UVLO EN/UVLO Pin Threshold (Falling Edge) 1.47 1.52 1.57 V EN/UVLO Hysteresis 185 mV EN/UVLO Pin Current EN/UVLO = 1.4V, V = 6V 5 A IN SYNC Pin Threshold (Falling Edge) 1.4 1.5 1.6 V SYNC Pin Hysteresis 675 mV Rev. C 2 For more information www.analog.com