LT3760 8-Channel 100mA LED Driver Fea T Descrip T n The LT 3760 is an 8-channel LED driver with a step-up Up to 45V of LEDs 100mA, 8-Channel LED Driver n DC/DC controller capable of driving up to 45V of LEDs. Wide Input Range : 6V to 40V (4.5V to 13V, Each channel contains an accurate current sink with 2% V Connected to INTV ) IN CC n current matching. Channels follow a master programmable 2% LED Current Matching at 40mA (Typ 0.7%) n current to allow between 20mA to 100mA of LED current Up to 3000:1 True Color PWM Dimming Range n per string. Channels can be paralleled for higher LED Single Resistor Sets LED Current (20mA to 100mA) n current. Output voltage adapts to variations in LED V for LED Current Regulated Even for PV > V IN OUT F n optimum efficiency and open LED faults do not affect the Output Adapts to LED V for Optimum Efficiency F n operation of connected LED strings. Fault Flag + Protection for Open LED Strings n Protection for LED Pin to V Short OUT The LT3760 allows a PWM dimming range up to 3000:1 n Parallel Channels for Higher LED Current and an analog dimming range up to 25:1. Operating n Programmable LED Current Derating vs Temperature frequency can be programmed from 100kHz up to 1MHz n Accurate Undervoltage Lockout Threshold with using a single resistor or synchronized to an external clock. Programmable Hysteresis Additional features include: programmable maximum n Programmable Frequency (100kHz to 1MHz) V for open LED protection, a fault flag for open LED, n Synchronizable to an External Clock OUT programmable LED current derating vs temperature, mi- cropower shutdown and internal soft-start. The LT3760 is a T available in a thermally enhanced 28-pin TSSOP package. L, LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks n Automotive, Notebook and TV Monitor Backlighting 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, 7321203. Typical a T Worst-Case Channels LED Current Matching 92% Efficient, 36W Backlight LED Driver (Normalized to 8-Channel Average) PV IN 20V TO 36V 4.7F 0.8 10H UP TO 45V OF LEDs PER STRING V IN 8V TO 14V 4.7F 5 0.4 V 2.2F IN INTV GATE CC 4.7F 499k SENSE 0.0 SHDN/UVLO 0.015 40.2k PGND CTRL V 0.4 OUT PWM LED1 LT3760 LED2 R = 14.7k (I(LED) = 40mA) ISET REF 0.8 8 CHANNELS 100mA 50 25 0 25 50 75 100 125 20k LED7 JUNCTION TEMERATURE (C) 3760 TA01 T SET LED8 3760 TA01 100k 30.9k 11k FAULT V IN OVP SET I V SYNC GND RT SET C 20k 39.2k 5.76k 10k 1MHz 2.2nF 3760fc 1 LED CURRENT MATCHING (%) ion pplica ions pplica ion uresLT3760 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW V , LED1-8 ............................................................60V OUT CTRL 1 28 OVP SET V , SHDN/UVLO, FAULT ...........................................40V IN T 2 27 PWM SET INTV ......................................................................13V CC V 3 26 V C REF INTV above V .................................................. +0.3V CC IN I 4 25 RT SET PWM, CTRL, SYNC .....................................................6V NC 5 24 GND V ...............................................................................3V C LED1 6 23 LED8 V , RT, I , T , OVP .......................................2V REF SET SET SET LED2 7 22 LED7 29 PGND SENSE ......................................................................0.4V LED3 8 21 LED6 Operating Junction Temperature Range LED4 9 20 LED5 PGND 10 19 PGND (Notes 2,3) ............................................. -40C to 125C SENSE 11 18 V OUT Storage Temperature Range .................. -65C to 150C GATE 12 17 SYNC Lead Temperature (Soldering, 10 sec) ...................300C INTV 13 16 FAULT CC V 14 15 SHDN/UVLO IN FE PACKAGE 28-LEAD PLASTIC TSSOP T = 125C, = 28C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3760EFE PBF LT3760EFE TRPBF LT3760FE 28-Lead Plastic TSSOP 40C to 125C LT3760IFE PBF LT3760IFE TRPBF LT3760FE 28-Lead Plastic TSSOP 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: