LT3479

PRODUCTION

3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection

Part Models: 4
1ku List Price: Starting From $4.04

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Overview

Wide Input Voltage Range: 2.5V to 24V
3A, 42V Internal Switch
High Efficiency Power Conversion: Up to 89%
Soft-Start
Frequency Set by External Resistor: 200kHz to 3.5MHz
Protection Against Input Short Circuits and Hot Plugging
Low V_CESAT Switch: 0.3V at 2.5A (Typical)
Capable of Positive and Negative Outputs
Available in Thermally Enhanced 14-Lead (4mm × 3mm) DFN and 16-Lead TSSOP Packages

The LT3479 is a current mode, fixed frequency step-up DC/DC converter with an internal 3A, 42V switch. Efficiencies of up to 89% can be achieved in typical applications. It features a programmable soft-start function to limit inductor current during start-up and inrush current protection to protect the LT3479 during shorts and line transients. Both inputs of the error amplifier are available to the user allowing positive and negative output voltages. Through an external resistor, the user can program the switching frequency from 200kHz to 3.5MHz. The low profile (0.75mm) 14-pin, 4mm × 3mm DFN package provides excellent thermal performance in a small footprint. The LT3479 is also available in a thermally enhanced 16-pin TSSOP package.

Applications

High Power LED Driver
DSL Modems
Distributed Power

Part Models: 4
1ku List Price: Starting From $4.04

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
LT3479EDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3479EDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3479EFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3479EFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LT3479EDE#PBF	PRODUCTION
LT3479EDE#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 Delta Qualification Matrix
LT3479EFE#PBF	PRODUCTION
LT3479EFE#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
Protection Switches & Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode

Tools & Simulations

LTspice 1

LT3479 Demo Circuit - 3A, Full Featured Step-up Converter (5V to 12V at 0.8A)

Models for the following parts are available in LTspice:

LT3479

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

LT3479EDE Demo Board | Positive/Negative Converter (LT3479 ×2), Boost: 2.5V ≤ VIN ≤ 4.2V, VOUT = 7V @ 600mA, Inverter: 2.5V ≤ VIN ≤ 12V, VOUT = –5V @ 600mA

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Product Details

Demonstration circuit 765B is a general purpose 1MHz, positive and negative converters featuring the LT3479EDE. The demo circuit demonstrates small size and low component count in a boost circuit and an inverting circuit. The boost converter is set up to convert a 2.5V to 4.2V input to 7V output at 600mA. The inverting circuit generates a –5V output at 600mA from an input of 2.5V to 12V.