LT3478

Name: LT3478
Brand: Analog Devices
Price: 5.46 USD
Availability: InStock

PRODUCTION

4.5A Monolithic LED Drivers with True Color PWM Dimming

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $5.46

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Overview

True Color PWM^™ Dimming Delivers Constant LED Color with Up to 3000:1 Range
Wide Input Voltage Range: 2.8V to 36V
4.5A, 60mΩ, 42V Internal Switch
Drives LEDs in Boost, Buck-Boost or Buck Modes
Integrated Resistors for Inductor and LED Current Sensing
Program LED Current:

100mA to 1050mA (LT3478-1)
(10mV to 105mV)/R_SENSE (LT3478)

Program LED Current De-Rating vs Temperature
Separate Inductor Supply Input
Inrush Current Protection
Programmable Soft-Start
Fixed Frequency Operation from 200kHz to 2.25MHz
Open LED Protection (Programmable OVP)
Accurate Shutdown/UVLO Threshold with Programmable Hysteresis
16-Pin Thermally Enhanced TSSOP Package

Part Models: 8
1ku List Price: Starting From $5.46

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
LT3478EFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478EFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478EFE-1#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478EFE-1#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478IFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478IFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478IFE-1#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3478IFE-1#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products
		PCN26_0072_Form Material_Report
LT3478EFE#PBF	PRODUCTION
LT3478EFE#TRPBF	PRODUCTION
LT3478EFE-1#PBF	PRODUCTION
LT3478EFE-1#TRPBF	PRODUCTION
LT3478IFE#PBF	PRODUCTION
LT3478IFE#TRPBF	PRODUCTION
LT3478IFE-1#PBF	PRODUCTION
LT3478IFE-1#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report
LT3478EFE#PBF	PRODUCTION
LT3478EFE#TRPBF	PRODUCTION
LT3478EFE-1#PBF	PRODUCTION
LT3478EFE-1#TRPBF	PRODUCTION
LT3478IFE#PBF	PRODUCTION
LT3478IFE#TRPBF	PRODUCTION
LT3478IFE-1#PBF	PRODUCTION
LT3478IFE-1#TRPBF	PRODUCTION

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
Digital to Analog Converters (DACs) 1
LTC2657	PRODUCTION	Octal I²C 16-/12-Bit Rail-to-Rail DACs with 10ppm/°C Max Reference
Hot Swap Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
Pulse-Width Modulation (PWM) & Pulse Generators 1
LTC6992		TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)
Temperature Sensors 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor

Tools & Simulations

LTspice 1

LT3478-1 Demo Circuit - Automotive TFT LCD Backlight Boost LED Driver (8-16V to 21V LEDs @ 700mA)

Models for the following parts are available in LTspice:

LT3478
LT3478-1

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

LT3478EFE-1 Demo Board | Boost LED Driver, Internal RSENSE, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA

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Product Details

Demonstration circuit 949A is a 4.5A peak switch current boost LED driver with PWM dimming featuring the LT3478/LT3478-1. The LT3478 can be used for boost, buck mode, and buck-boost mode LED drivers. DC949A-A includes the LT3478-1, a fixed 1A boost LED driver with the LED current sense resistor inside the IC. DC949A-B features the LT3478 adjustable current boost LED driver; it requires an external sense resistor (R11). Both circuits are optimized to drive a 350mA LED string with a total LED voltage above the input voltage and below 40V (overvoltage protection is set between 36V and 40V).

The IC's input voltage range is 2.8V to 16V and the LED power input voltage range is 2.8V to 25V (for V_LED >25V). With an internal 4.5A NPN power switch, floating current sense amplifier, LED current PWM dimming control, inrush current protection, programmable switching frequency, soft-start, and overvoltage protection, the LT3478-1/LT3478 are extremely powerful and versatile LED driving

Resources

DC949A - Schematic
9/24/2009

DC949A - Demo Manual
9/24/2009

DC949A - Design File
9/24/2009

LT3478EFE Demo Board | Boost LED Driver, Adjustable LED Current, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA

Buy Now View Details

Product Details

The IC's input voltage range is 2.8V to 16V and the LED power input voltage range is 2.8V to 25V (for V_LED > 25V). With an internal 4.5A NPN power switch, floating current sense amplifier, LED current PWM dimming control, inrush current protection, programmable switching frequency, soft-start, and overvoltage protection, the LT3478-1/LT3478 are extremely powerful and versatile LED driving ICs.