LT3756/LT3756-1/LT3756-2 100V , 100V IN OUT LED Controller FEATURES DESCRIPTION n 3000:1 True Color PWM Dimming The LT 3756, LT3756-1 and LT3756-2 are DC/DC control- n Wide Input Voltage Range: 6V to 100V lers designed to operate as a constant-current source for n Output Voltage Up to 100V driving high current LEDs. They drive a low side external n Constant-Current and Constant-Voltage Regulation N-channel power MOSFET from an internal regulated 7.15V n 100mV High Side Current Sense supply. The fixed frequency, current-mode architecture n Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, results in stable operation over a wide range of supply SEPIC or Flyback Topology and output voltages. A ground referenced voltage FB pin n Adjustable Frequency: 100kHz to 1MHz serves as the input for several LED protection features, n Open LED Protection and also makes it possible for the converter to operate n Programmable Undervoltage Lockout with Hysteresis as a constant-voltage source. A frequency adjust pin n Improved Open LED Status Pin (LT3756-2) allows the user to program the frequency from 100kHz n Frequency Synchronization (LT3756-1) to 1MHz to optimize efficiency, performance or external n PWM Disconnect Switch Driver component size. n CTRL Pin Provides Analog Dimming The LT3756/LT3756-1/LT3756-2 sense output current at n Low Shutdown Current: <1A the high side of the LED string. High side current sensing n Programmable Soft-Start is the most flexible scheme for driving LEDs, allowing n Thermally Enhanced 16-Lead QFN (3mm 3mm) boost, buck mode or buck-boost mode configuration. and MSOP Packages The PWM input provides LED dimming ratios of up to n AEC-Q100 Qualified for Automotive Applications 3000:1, and the CTRL input provides additional analog dimming capability. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. Protected n by U.S. patents, including 7199560 and 7321203. High Power LED Applications n Current Limited Constant Voltage Applications n Battery Charging TYPICAL APPLICATION 94% Efficient 30W White LED Headlamp Driver Efficiency vs V IN V IN 8V TO 60V 22H 100 (100V TRANSIENT) 4.7F 4.7F 1M 1M V IN 96 SHDN/UVLO FB V ISP 185k REF 14k 332k LT3756-2 92 0.27 370mA CTRL ISN INTV CC 40.2k GATE 88 100k SENSE OPENLED 30W 0.018 PWM LED 84 SS STRING RT PWMOUT 0.01F V GND INTV C CC 80 28.7k 0 20 40 60 80 375kHz 10k INTV CC 1% V (V) IN 0.001F 4.7F 375612 TA01b 375612 TA01a Rev. C 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT3756/LT3756-1/LT3756-2 ABSOLUTE MAXIMUM RATINGS (Note 1) V ..........................................................................100V RT ............................................................................1.5V IN SHDN/UVLO ............................................................100V SENSE ......................................................................0.5V ISP, ISN ...................................................................100V Operating Junction Temperature Range (Notes 2, 3) INTV ...................................................... V + 0.3V, 8V LT3756E, LT3756I ..............................40C to 125C CC IN GATE, PWMOUT (Note 4) ..........................INTV + 0.3V LT3756H/LT3756J .............................. 40C to 150C CC CTRL, PWM, OPENLED .............................................12V Storage Temperature Range ...................65C to 150C VC, V , SS, FB .........................................................3V Lead Temperature (Soldering, 10 sec) REF SYNC ..........................................................................8V MSE .................................................................. 300C PIN CONFIGURATION TOP VIEW 16 15 14 13 TOP VIEW V 1 12 FB PWMOUT 1 16 GATE REF FB 2 15 SENSE PWM 2 11 PWMOUT 17 ISN 3 14 V IN GND ISP 4 13 INTV SYNC OR OPENLED GATE 17 3 10 CC VC 5 12 SHDN/UVLO GND SS 4 9 SENSE CTRL 6 11 RT V 7 10 SS REF 5 6 7 8 PWM 8 9 SYNC OR OPENLED MSE PACKAGE 16-LEAD PLASTIC MSOP T = 125C (E-,I-GRADES), T = 150C (H, J-GRADES), = 43C/W, = 4C/W JMAX JMAX JA JC EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB UD PACKAGE 16-LEAD (3mm 3mm) PLASTIC QFN T = 125C, = 68C/W, = 4.2C/W JMAX JA JC EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3756EMSE PBF LT3756EMSE TRPBF 3756 16-Lead Plastic MSOP 40C to 125C LT3756IMSE PBF LT3756IMSE TRPBF 3756 16-Lead Plastic MSOP 40C to 125C LT3756EMSE-1 PBF LT3756EMSE-1 TRPBF 37561 16-Lead Plastic MSOP 40C to 125C LT3756IMSE-1 PBF LT3756IMSE-1 TRPBF 37561 16-Lead Plastic MSOP 40C to 125C LT3756EMSE-2 PBF LT3756EMSE-2 TRPBF 37562 16-Lead Plastic MSOP 40C to 125C LT3756IMSE-2 PBF LT3756IMSE-2 TRPBF 37562 16-Lead Plastic MSOP 40C to 125C LT3756HMSE-2 PBF LT3756HMSE-2 TRPBF 37562 16-Lead Plastic MSOP 40C to 150C LT3756JMSE-2 PBF LT3756JMSE-2 TRPBF 37562 16-Lead Plastic MSOP 40C to 150C LT3756EUD PBF LT3756EUD TRPBF LDMQ 16-Lead (3mm 3mm) Plastic QFN 40C to 125C LT3756IUD PBF LT3756IUD TRPBF LDMQ 16-Lead (3mm 3mm) Plastic QFN 40C to 125C LT3756EUD-1 PBF LT3756EUD-1 TRPBF LDMR 16-Lead (3mm 3mm) Plastic QFN 40C to 125C LT3756IUD-1 PBF LT3756IUD-1 TRPBF LDMR 16-Lead (3mm 3mm) Plastic QFN 40C to 125C LT3756EUD-2 PBF LT3756EUD-2 TRPBF LFKB 16-Lead (3mm 3mm) Plastic QFN 40C to 125C LT3756IUD-2 PBF LT3756IUD-2 TRPBF LFKB 16-Lead (3mm 3mm) Plastic QFN 40C to 125C Rev. C 2 For more information www.analog.com RT CTRL SHDN/UVLO VC INTV ISP CC V ISN IN