LT3966

Name: LT3966
Brand: Analog Devices
Price: 5.89 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

I²C Programmable Quad Monolithic Boost LED Driver

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $5.89

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Overview

Four Independent DC/DC Channels
I²C Programmable
8192:1 True Color PWM™ Dimming
8-Bit Analog Dimming Pin Scaled by DAC
11-Channel, 8-Bit ADC with 2 External Inputs
1.6A, 60V Internal DMOS Switches

Input Voltage: 3V to 60V
Output Voltage and Current Monitoring to 60V
High Side PMOS Disconnect and PWM Switch Driver
Adjustable Frequency: 300kHz to 4MHz with Optional Frequency Synchronization
Thermally Enhanced 6mm × 6mm 40-Lead QFN Package n AEC-Q100 Qualification in Progress

Part Models: 4
1ku List Price: Starting From $5.89

Documentation

Data Sheet 1

LT3966: I²C Programmable Quad Monolithic Boost LED Driver Data Sheet (Rev.0) 10/13/2020

User Guide 1

DC2630A - Demo Manual (Rev.0) 10/23/2020

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
LT3966EUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3966EUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3966JUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3966JUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

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

Software Resources

Evaluation Software 1

LT3966 - Firmware

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT3966

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

I2C Programmable Quad Monolithic Boost LED Driver

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Features and Benefits

Demonstration circuit 2630A is an I²C programmable quad channel monolithic boost LED driver featuring the LT3966. It drives four separate strings of LEDs (up to 50V) at 125mA when V_IN is between 9V and 18V. DC2630A runs at 2MHz switching frequency. Its four channels are capable of powering LED strings which can have different currents, voltages, or dimming ratios. Each channel can be independently controlled via I²C communications or analog inputs. DC2630A can be configured to run in either mode by modifying the ADDR pin settings. It is protected against output overcurrent, overvoltage events, and reports open and short LED fault events by latching an alert pin. In I²C mode, faults can be enabled or disabled. A DC2026C Linduino^® One demonstration circuit is used to interface with the board by directly connecting it with a QuikEval^™ ribbon cable and provided command line interface code.

The LT3966 has an input voltage range from 3V to 60V. Each boost channel has an integrated 60V 1.6A low-side power switch. It has adjustable switching frequency between 300kHz and 2MHz and can be synchronized to an external clock source. Additionally, LT3966 can be programmed to output its own master clock to sync other devices. The high side PWMTG MOSFET drivers assist with PWM dimming and fault protection. The LT3966 channels can be configured to operate as a ground-referenced step-up (boost) LED driver, or as a floating output LED driver to perform step-down (buck mode) or step-up/step-down (buck-boost mode) operation.

Each channel of the LT3966 can be independently dimmed by applying a PWM signal or CTRL voltage to the corresponding channel CTRL/PWM pin while operating in non-I²C mode. In I²C mode, each channel has a maximum of 13 bits of PWM dimming resolution and 8 bits of analog dimming resolution.

Small ceramic input and output capacitors are used to save space and cost. The open LED overvoltage protection uses the IC’s constant-voltage regulation loop to regulate the output to approximately 57V if the LED string is opened.

Undervoltage lockout can be adjusted on the circuit with a few simple resistor choices. The output voltage (overvolt-age protection) can be adjusted by changing the feedback resistors for different string voltages. Other components may need to be changed to accommodate the change in output voltages as well.

The LT3966 data sheet gives a complete description of the device, operation and applications information. The data sheet must be read in conjunction with the demo manual for DC2630A. The LT3966EUJ is assembled in a 40-lead plastic 6mm × 6mm QFN package with a thermally enhanced ground.