Analog Devices LT3965-1

Description

The LT®3965/LT3965-1 is an LED bypass switching devicefor dimming individual LEDs in a string using a commoncurrent source. It features eight individually controlledfloating source 17V/330mΩ NMOS switches. The eightswitches can be connected in parallel and/or in series tobypass current around one or more LEDs in a string. TheLT3965 is initialized with all switches off (LEDs on), andthe LT3965-1 is initialized with all switches on (LEDs off)The LT3965/LT3965-1 uses the I2C serial interface tocommunicate with the microcontroller. Each of the eightchannels can be independently programmed to bypassthe LED string in constant on or off, or PWM dimmingwith or without fade transition. Using the fade optionprovides 11-bit resolution logarithmic transition betweenPWM dimming states. The LT3965/LT3965-1 providesan internal clock generator and also supports externalclock source for PWM dimming. The LT3965/LT3965-1reports fault conditions for each channel such as openLED and shorted LED. The four address select pins allow16 LT3965/LT3965-1 devices to share the I2C bus. Thedevice is available in a 28-lead TSSOP package

Features

Eight Independent 17V 330mΩ NMOS SwitchesIndependent On/Off/Dimming Control of 1 to 4 LEDsfor Each SwitchI2C Multidrop Serial Interface with ProgrammableOpen LED and Shorted LED Fault Reporting16 Unique I2C AddressesVDD Range: 2.7V to 5.5V and VIN Range: 8V to 60VDigital Programmable 256:1 PWM DimmingFade Transition Between PWM Dimming StatesOptional Internal Clock Generator or External ClockSource for PWM DimmingOpen LED Overvoltage ProtectionFlicker Free PWM Dimming

Typical applications

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

More information

• Datasheet
• IC product information