LT3965
LT3965-1

PRODUCTION

8-Switch Matrix LED Dimmer

Data Sheet (Rev. B) Product Selection Table

Part Models: 16
1ku List Price: Starting From $4.72

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Overview

Eight Independent 17V 330mΩ NMOS Switches
Independent On/Off/Dimming Control of 1 to 4 LEDs for Each Switch
I²C Multidrop Serial Interface with Programmable Open LED and Shorted LED Fault Reporting
16 Unique I²C Addresses
V_DD Range: 2.7V to 5.5V and V_IN Range: 8V to 60V

Digital Programmable 256:1 PWM Dimming
Fade Transition Between PWM Dimming States
Optional Internal Clock Generator or External Clock Source for PWM Dimming
Open LED Overvoltage Protection
Flicker Free PWM Dimming
AEC-Q100 Qualified for Automotive Applications

The LT3965/LT3965-1 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 17V/330mΩ NMOS switches. The eight switches can be connected in parallel and/or in series to bypass current around one or more LEDs in a string. The LT3965 is initialized with all switches off (LEDs on), and the LT3965-1 is initialized with all switches on (LEDs off)The LT3965/LT3965-1 uses the I²C serial interface to communicate with the 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 fade option provides 11-bit resolution logarithmic transition between PWM dimming states. The LT3965/LT3965-1 provides an internal clock generator and also supports external clock source for PWM dimming. The LT3965/LT3965-1 reports fault conditions for each channel such as open LED and shorted LED. The four address select pins allow 16 LT3965/LT3965-1 devices to share the I²C bus. The device is available in a 28-lead TSSOP package.

Applications

Automotive LED Headlight Clusters
Large LED Displays
Automated Camera Flash Equipment
RGBW Color Mixing Lighting

Part Models: 16
1ku List Price: Starting From $4.72

Documentation

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
LT3965EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE#WTRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE-1#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE-1#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE-1#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965EFE-1#WTRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE#WTRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE-1#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE-1#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE-1#WPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3965IFE-1#WTRPBF	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
LT3965EFE#PBF	PRODUCTION
LT3965EFE#TRPBF	PRODUCTION
LT3965EFE#WPBF	PRODUCTION
LT3965EFE#WTRPBF	PRODUCTION
LT3965EFE-1#PBF	PRODUCTION
LT3965EFE-1#TRPBF	PRODUCTION
LT3965EFE-1#WPBF	PRODUCTION
LT3965EFE-1#WTRPBF	PRODUCTION
LT3965IFE#PBF	PRODUCTION
LT3965IFE#TRPBF	PRODUCTION
LT3965IFE#WPBF	PRODUCTION
LT3965IFE#WTRPBF	PRODUCTION
LT3965IFE-1#PBF	PRODUCTION
LT3965IFE-1#TRPBF	PRODUCTION
LT3965IFE-1#WPBF	PRODUCTION
LT3965IFE-1#WTRPBF	PRODUCTION
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LT3965EFE#PBF	PRODUCTION
LT3965EFE#TRPBF	PRODUCTION
LT3965EFE-1#PBF	PRODUCTION
LT3965EFE-1#TRPBF	PRODUCTION
LT3965IFE#PBF	PRODUCTION
LT3965IFE#TRPBF	PRODUCTION
LT3965IFE-1#PBF	PRODUCTION
LT3965IFE-1#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

Linduino 3

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

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Evaluation Kits

LT3965EFE/LT3797 Demo Board | 2-String Buck LED Driver with Matrix LED Dimmer; 9V ≤ VIN ≤ 30V, up to 30VLED @ 500mA (8 LEDs/String)

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Product Details

Demonstration circuit DC2218A is a matrix LED dimmer system featuring the LT3965 8-switch matrix LED dimmer IC. There are 16 500mA LEDs that can be individually turned on, off, or PWM dimmed with two 8-switch LED dimmer LT3965 ICs. The two strings of LEDs are driven with two buck LED driver outputs of the LT3797 triple LED controller IC. The third channel of the LT3797 serves as a 30V pre-boost voltage regulator to provide a proper input voltage to the two buck LED driver channels. DC2218A can be driven from a 9V to 30V input and can survive transients up to 36V.