LT3967

RECOMMENDED FOR NEW DESIGNS

1.3A Eight-Switch Matrix LED Dimmer with CRC-8

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.62

Viewing:

Overview

Eight Independent 15V/110mΩ NMOS Switches
Controls LED Dimming of Strings Up to 54V
I²C Serial Interface with Programmable Address
I²C Packet Error Checking with CRC-8
Programmable 256:1 (8-Bit) PWM Dimming
11-Bit Precision Exponential Fade with Programmable Time
Independent On/Off Control for Each Switch

Programmable Shorted/Open LED Threshold with Fault Reporting
Internal PWM Signal Generator
Programmable Watchdog Timer
Accurate V_IN Referred Enable Pin
User Defined Power-Up/Reset State of Switches
Thermally Enhanced TSSOP Package

The LT3967 is an LED bypass switching device for dimming individual LEDs in a string using a common current source. It features eight individually controlled floating source 15V/110mΩ NMOS switches. The eight switches can be connected in parallel and/or in series to bypass current around LEDs in a string. The LT3967 uses the I²C serial interface to communicate with a microcontroller. Each of the eight channels can be independently programmed to bypass the LED string in constant on or off, or PWM dimming with or without fade transition. Using the programmable fade option provides 11-bit resolution exponential transition between PWM dimming states. The LT3967 provides an internal clock generator and also supports an external clock source for PWM dimming. The LT3967 reports fault conditions for each channel such as open LED and shorted LED. The four address pins allow 16 LT3967 devices to share the I²C bus and define the power-up state of the switches.

APPLICATIONS

Automotive LED Headlight Clusters
Large LED Displays
RGBW Color Mixing Lighting

Part Models: 4
1ku List Price: Starting From $4.62

Documentation

Data Sheet 1

LT3967: 1.3A Eight-Switch Matrix LED Dimmer with CRC-8 Data Sheet (Rev.0) 08/28/2020

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3967EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3967EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3967JFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3967JFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3967EFE#PBF	PRODUCTION
LT3967EFE#TRPBF	PRODUCTION
LT3967JFE#PBF	PRODUCTION
LT3967JFE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Evaluation Kits

LT3960 and LT3967 Demo Board | 1.3A 8-Switch Matrix LED Dimmer with I2C to CAN-Physical Layer Transceiver

Buy Now View Details

Product Details

Demonstration circuit 2686A is a 1.3A 8-switch matrix LED dimmer system with an I²C to CAN-physical transceiver featuring the LT3967 and LT3960. This demonstration circuit connects directly to a LED string and LED driver demonstration circuit to allow for independent dimming control of up to 8 channels of LEDs. A Linduino^® One demonstration circuit is used to interface with the board and can connect in one of two different ways:

Connect directly to a Linduino One demonstration circuit with a QuikEval^™ ribbon cable.
Connect using the LT3960 break-off board to connect to the I²C master device, but pass data over two twisted pair lines to the LT3960 on the main PCB.

The LT3967 matrix dimmer features 8 individually con-trolled 1.3A rated floating NMOS switch channels and can support up to 56V of LEDs per device. The channels of the LT3967 can be configured for series connections, or non-series connections. Additional DC2686A demo circuits can be connected in series for higher number of LEDs, or in parallel to allow for higher current operation. Resistors are used to configure both the I²C slave address as well as the default start-up state. The default configuration for DC2686A sets the I²C address as 0000 with all LEDs off. See the LT3967 data sheet for details.

The LT3960 I²C to CAN-Physical transceiver is used to send and receive I²C data through harsh or noisy environments at up to 400kb/s using the CAN-Physical layer for differential signaling over twisted pair connections. Both SDA and SCL data lines are converted to differential signals and are shared between devices connected to the bus. This allows for physical separation of the I²C source with the LT3960 transceiver board and the LT3967 main PCB along with the LED driver.

This demo circuit is designed to be easily configured and interfaced with a compatible low output capacitance LED driver and LED string. It can easily be directly attached to a buck LED driver or a floating buck-mode LED driver. More sophisticated setups with series matrix dimmers for higher number of LEDs such as 12 or 16 is possible. Please consult factory applications for details or look for more details on analog.com.

The LT3967 and LT3960 data sheets give complete description of the parts, their operation and applications information. The data sheets must be read in conjunction with the demo manual for demonstration circuit DC2686A. The LT3967EFE is assembled in a thermally enhanced 28-lead TSSOP package. The LT3960EMSE is assembled in a 10-lead MSOP package.