LT3754 16-Channel 50mA LED Driver Fea T Descrip T n Up to 45V of LEDs 50mA, 16-Channel LED Driver The LT 3754 is a 16-channel LED driver with a step-up n Wide Input Range : 6V to 40V (4.5V to 13V, DC/DC controller capable of driving up to 45V of LEDs. V Connected to INTV ) Each channel contains an accurate current sink with 2.8% IN CC n 2.8% LED Current Matching at 20mA (Typ 0.7%) current matching. Channels follow a master programmable n Up to 3000:1 True Color PWM Dimming Range current to allow between 10mA to 50mA of LED current n Single Resistor Sets LED Current (10mA to 50mA) per string. Channels can be paralleled for higher LED n LED Current Regulated Even for PV > V current. Output voltage adapts to variations in LED V for IN OUT F n Output Adapts to LED V for Optimum Efficiency optimum efficiency and open LED faults do not affect the F n Fault Flag + Protection for Open LED Strings operation of connected LED strings. n Protection for LED Pin to V Short OUT The LT3754 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 n Additional features include: programmable maximum Programmable Frequency (100kHz to 1MHz) n V for open LED protection, a fault flag for open LED, Synchronizable to an External Clock OUT programmable LED current derating vs temperature, a T micropower shutdown and internal soft-start. The LT3754 is available in a thermally enhanced 5mm 5mm 32-pin n Automotive, Notebook and TV Monitor Backlighting QFN package. L, LT, LTC and 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, 7321203. Typical a T Worst-Case Channels LED Current Matching 92% Efficient, 36W Backlight LED Driver (Normalized to 16-Channel Average) PV IN 24V 4.7F 0.8 10H UP TO 45V OF LEDs PER STRING V IN 10V 4.7F 5 V 2.2F 0.4 IN INTV GATE CC 4.7F 499k SENSE SHDN/UVLO 0.015 0.0 40.2k CTRL V OUT 0.4 LT3754 PWM LED1 LED2 R = 14.7k (I(LED) = 20mA) V ISET 16 CHANNELS REF 0.8 50 25 0 25 50 75 100 125 20k LED15 JUNCTION TEMERATURE (C) T SET LED16 3754 TA01 V 3754 TA01 IN 100k 30.9k 11k FAULT OVP SET GND RT I V SYNC SET C 20k 39.2k 5.76k 10k 2.2nF 3754fc 1 LED CURRENT MATCHING (%) ion pplica ions pplica ion uresLT3754 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW V , LED1-16 ..........................................................60V OUT V , SHDN/UVLO, FAULT ...........................................40V IN INTV ......................................................................13V CC 32 31 30 29 28 27 26 25 INTV above V ...................................................+0.3V CC IN LED1 LED16 1 24 PWM, CTRL, SYNC .....................................................6V LED2 LED15 2 23 V ...............................................................................3V LED3 LED14 3 22 C LED4 4 21 LED13 V , RT, I , T , OVP .......................................2V REF SET SET SET 33 LED5 5 20 LED12 SENSE ......................................................................0.4V LED6 6 19 LED11 Operating Junction Temperature Range LED7 7 18 LED10 (Notes 2,3) ............................................. 40C to 125C LED8 8 17 LED9 Storage Temperature Range ..................65C to 150C 9 10 11 12 13 14 15 16 UH PACKAGE 32-LEAD (5mm 5mm) PLASTIC QFN T = 125C, = 34C/W, = 3C/W JMAX JA JC EXPOSED PAD (PIN 33) IS GND, 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 LT3754EUH PBF LT3754EUH TRPBF 3754 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LT3754IUH PBF LT3754IUH TRPBF 3754 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: