LT3431

PRODUCTION

LT3431

High Voltage, 3A, 500kHz Step-Down Switching Regulator

PRODUCTION

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Part Models 4

1ku List Price Starting From $6.57

Features

Wide Input Range: 5.5V to 60V
3A Peak Switch Current
Small Thermally Enhanced 16-Pin TSSOP Package
Constant 500kHz Switching Frequency
Saturating Switch Design: 0.1Ω
Peak Switch Current Maintained Over Full Duty Cycle Range
Effective Supply Current: 2.5mA
Shutdown Current: 30µA
1.2V Feedback Reference Voltage
Easily Synchronizable
Cycle-by-Cycle Current Limiting

Additional Details

The LT3431 is a 500kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and the device can be externally synchronized from 580kHz to 700kHz with logic level inputs.

The LT3431 is available in a thermally enhanced 16-pin TSSOP package.

Applications

Industrial and Automotive Power Supplies
Portable Computers
Battery Chargers
Distributed Power Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $6.57

Documentation

Technical Documents 4

LT3431: High Voltage, 3A, 500kHz Step-Down Switching Regulator Data Sheet 08/30/2007

R468 Reliability Data 03/23/2018

DC549A - Demo Manual 09/24/2009

Design Note 318: Efficient Dual Polarity Output Converter Fits into Tight Spaces 08/01/2003

Design Resources 4

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
LT3431EFE#PBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3431EFE#TRPBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3431IFE#PBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3431IFE#TRPBF	16-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3431EFE#PBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3431EFE#TRPBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3431IFE#PBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3431IFE#TRPBF
Pin/Package Drawing
16-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3431EFE#PBF

PRODUCTION

LT3431EFE#TRPBF

PRODUCTION

LT3431IFE#PBF

PRODUCTION

LT3431IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3431EFE#PBF

PRODUCTION

LT3431EFE#TRPBF

PRODUCTION

LT3431IFE#PBF

PRODUCTION

LT3431IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Software & Part Ecosystem

Companion Parts 4

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LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators1
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Evaluation Kit

DC549A

LT3431EFE Demo Board | 60V Transients, 7.5V ≤ VIN ≤ 20V, VOUT = 5V @ 2A

DC549A

LT3431EFE Demo Board | 60V Transients, 7.5V ≤ VIN ≤ 20V, VOUT = 5V @ 2A

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Product Detail

Demonstration circuit 549 is a monolithic step-down DC/DC switching converter using the LT3431. The board is optimized for 5V output at up to 2A load current for a steady state input voltage range of 7.5V to 20V. The LT3431 is capable of withstanding input transients to 60V and runs at 500kHz with steady state input voltages that require duty cycles between 25% and 75%.

Resources

PDF

DC549A - Demo Manual

238.00K

PDF

DC549A - Schematic

62.00K

ZIP

DC549A - Design File

486.00K

DC549A

LT3431EFE Demo Board | 60V Transients, 7.5V ≤ VIN ≤ 20V, VOUT = 5V @ 2A

Tools & Simulations

LTspice 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.