LT3476

PRODUCTION

High Current Quad Output LED Driver

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $5.53

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Part Details

True Color PWM^™ Dimming Delivers Up to 5000:1 Dimming Ratio (In Boost Configuration)
LED Current Regulation with High-Side Sense
VADJ Pin Accurately Sets LED Current Sense Threshold Over Range 10mV to 120mV
Four Independent Driver Channels with 1.5A, 36V Internal NPN Switches
Frequency Adjust Pin: 200kHz to 2MHz
High Efficiency Conversion = Up to 96%
Open LED Protection
Low Shutdown Current < 10μA
Wide V_IN Range: 2.8V to 16V
Thermally Enhanced, 38-Lead, 5mm × 7mm QFN Package

Part Models: 4
1ku List Price: Starting From $5.53

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
LT3476EUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3476EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3476IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3476IUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog Temperature Sensors 1
LTC2997	PRODUCTION	Remote/Internal Temperature Sensor
Power Monitors 1
LT2940	PRODUCTION	Power and Current Monitor
TimerBlox 1
LTC6992		TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)

Tools & Simulations

LTspice 1

LT3476 Demo Circuit - High Current Quad Buck LED Driver (33V to 7x 3.4V LEDs @ 1A)

Models for the following parts are available in LTspice:

LT3476

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

LT3476EUHF Demo Board | Quad Buck Mode LED Driver, PVIN ≤ 33V, Up to 27VLED @ 350mA or 1.05A

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Product Details

Demonstration circuit 976 is a Quadruple High Power LED Driver in Buck Mode featuring the LT3476EUHF. The LT3476 is a quad output, multitopology DC/DC converter designed to operate as a current source for driving high current LEDs. Each of the four regulators on the demo circuit is independently operated. The V_IN power supply for the IC ranges from 2.8V to 16V. The PV_IN power supply for the buck regulators ranges up to 33V.

On the demo circuit, the default current for each output channel is 350mA but it can be adjusted up to 1.05A via resistor dividers at the VADJ pins. The output current should not exceed the rated current of the LEDs used. If 1W LEDs, such as the Lumileds Luxeon LEDs, are used, 350mA current is the maximum. 1A output current is reserved for 3W LEDs, such as Luxeon III.

The input voltage is limited by the CAP pin overvoltage protection threshold. As a result, each channel of the demo circuit can drive up to 27V total LED voltage.

Resources

DC976A - Demo Manual
9/24/2009

DC976A - Schematic
9/24/2009

DC976A - Design File
9/24/2009

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