DC2218A Analog Devices

LT3965/LT3965-1 8-Switch Matrix LED Dimmer FEATURES DESCRIPTION n Eight Independent 17V 330m NMOS Switches The LT 3965/LT3965-1 is an LED bypass switching n Independent On/Off/Dimming Control of 1 to 4 LEDs device for dimming individual LEDs in a string using a for Each Switch common current source. It features eight individually 2 n I C Multidrop Serial Interface with Programmable controlled floating source 17V/330m NMOS switches. Open LED and Shorted LED Fault Reporting The eight switches can be connected in parallel and/or 2 n 16 Unique I C Addresses in series to bypass current around one or more LEDs in n V Range: 2.7V to 5.5V and V Range: 8V to 60V a string. The LT3965 is initialized with all switches off DD IN n Digital Programmable 256:1 PWM Dimming (LEDs on), and the LT3965-1 is initialized with all switches n 2 Fade Transition Between PWM Dimming States on (LEDs off)The LT3965/LT3965-1 uses the I C serial n Optional Internal Clock Generator or External Clock interface to communicate with the microcontroller. Each Source for PWM Dimming of the eight channels can be independently programmed n Open LED Overvoltage Protection to bypass the LED string in constant on or off, or PWM n Flicker Free PWM Dimming dimming with or without fade transition. Using the fade n AEC-Q100 Qualified for Automotive Applications option provides 11-bit resolution logarithmic transition between PWM dimming states. The LT3965/LT3965-1 APPLICATIONS provides an internal clock generator and also supports n external clock source for PWM dimming. The LT3965/ Automotive LED Headlight Clusters n LT3965-1 reports fault conditions for each channel such Large LED Displays n as open LED and shorted LED. The four address select Automated Camera Flash Equipment 2 n pins allow 16 LT3965/LT3965-1 devices to share the I C RGBW Color Mixing Lighting bus. The device is available in a 28-lead TSSOP package. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Matrix LED Dimmer Powered by a Buck Mode LED Driver BIAS UVLO DETECT 750 Q2 BIAS Q1 1k 49.9k M1 1k D4 + 1k LED BIAS 0.5 V + IN Q3 LED 40V 1F EN/UVLO 100V 9.09k D2 D3 V CC V V IN DRN8 DD 20k 5V V ISP ISN 0.1F IN SRC8 10k 10k 10k EN/UVLO INTV CC DRN7 0.1F SDA SDA SRC7 PWM PWMOUT 100V LT3965/ DRN6 SCL SCL 2.2nF 1F LT3965-1 SYNC SRC6 ALERT ALERT VMODE LT3955 DRN5 V FB REF 500mA SRC5 EN/UVLO EN/UVLO CTRL GND DRN4 V LED RTCLK 1F GNDK SRC4 26V 28k 50V DRN3 500Hz DIMMING FREQUENCY PGND SW SRC3 ADDR1 RT DIM/SS VC DRN2 ADDR2 28.7k L1: WURTH 744066330 0.1F 0.01F SRC2 375kHz D1: DFLS260 ADDR3 DRN1 L1 D2, D3: CMSD6263S 2 IN 1 PACKAGE D1 ADDR4 33H D4, D5: PMEG6010CEH M1: VISHAY Si7309DN SRC1 LEDREF GND IN4148 Q1, Q3: ZETEX FMMT593 28k LED D5 Q2: ZETEX FMMT493 3965 TA01 Rev. B 1 Document Feedback For more information www.analog.comLT3965/LT3965-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V ............................................................................60V TOP VIEW IN V -SRC 8:1 ..........................................................0.3V DRN8 1 28 SRC8 IN DRN 8:1 ...................................................................60V V 2 27 DRN7 IN SRC 8:1 ....................................................................60V EN/UVLO 3 26 SRC7 ALERT 4 25 DRN6 LEDREF .....................................................................60V SCL 5 24 SRC6 DRN 8:1 -SRC 8:1 (Each Channel) ................0.3V, 25V SDA 6 23 DRN5 EN/UVLO ...................................................................12V V 7 22 SRC5 DD 29 V .............................................................................6V DD GND RTCLK 8 21 DRN4 SDA, SCL, ALERT ............................ 0.3V to V + 0.3V DD ADDR1 9 20 SRC4 RTCLK .........................................................................6V ADDR2 10 19 DRN3 ADDR 4:1 ...................................................................6V ADDR3 11 18 SRC3 Operating Junction Temperature Range (Note 2) ADDR4 12 17 DRN2 LT3965E/LT3965E-1/LT3965I/LT3965I-1 40C to 125C LEDREF 13 16 SRC2 Storage Temperature Range .................. 65C to 150C SRC1 14 15 DRN1 FE PACKAGE 28-LEAD PLASTIC TSSOP = 10C/W JC 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 LT3965EFE PBF LT3965EFE TRPBF LT3965FE 28-Lead Plastic TSSOP 40C to 125C LT3965EFE-1 PBF LT3965EFE-1 TRPBF LT39651FE 28-Lead Plastic TSSOP 40C to 125C LT3965IFE PBF LT3965IFE TRPBF LT3965FE 28-Lead Plastic TSSOP 40C to 125C LT3965IFE-1 PBF LT3965IFE-1 TRPBF LT39651FE 28-Lead Plastic TSSOP 40C to 125C AUTOMOTIVE PRODUCTS** LT3965EFE WPBF LT3965EFE WTRPBF LT3965FE 28-Lead Plastic TSSOP 40C to 125C LT3965IFE WPBF LT3965IFE WTRPBF LT3965FE 28-Lead Plastic TSSOP 40C to 125C LT3965EFE-1 WPBF LT3965EFE-1 WTRPBF LT39651FE 28-Lead Plastic TSSOP 40C to 125C LT3965IFE-1 WPBF LT3965IFE-1 WTRPBF LT39651FE 28-Lead Plastic TSSOP 40C to 125C 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. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. B 2 For more information www.analog.com