LTC3425

RECOMMENDED FOR NEW DESIGNS

LTC3425

5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter

RECOMMENDED FOR NEW DESIGNS

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1ku List Price Starting From $5.81

Features

High Efficiency: Up to 95%
Up to 3A Continuous Output Current
4-Phase Operation for Low Output Ripple and Tiny Solution Size
Output Disconnect and Inrush Current Limiting
Very Low Quiescent Current: 12µA
0.5V to 4.5V Input Range
2.4V to 5.25V Adjustable Output Voltage
Adjustable Current Limit
Adjustable, Fixed Frequency Operation from 100kHz to 2MHz per Phase
Synchronizable Oscillator with Sync Output
Internal Synchronous Rectifiers
Manual or Automatic Burst Mode^® Operation
Power Good Comparator
<1µA Shutdown Current
Antiringing Control
5mm x 5mm Thermally Enhanced QFN Package

Additional Details

The LTC3425 is a synchronous, 4-phase boost converter with output disconnect capable of operation below 1V input. It includes four N-channel MOSFET switches and four P-channel synchronous rectifiers for an effective R_DS(ON) of 0.045Ω and 0.05Ω, respectively. 4-phase operation greatly reduces peak inductor currents, and capacitor ripple current, and increases effective switching frequency, minimizing inductor and capacitor sizes. True output disconnect eliminates inrush current and allows zero load current in shutdown. External Schottky diodes are not required in most applications (V_OUT < 4.3V). Power saving Burst Mode operation can be user controlled or left in automatic mode.

Other features include 1µA shutdown current, programmable frequency with sync in and out, programmable soft-start, antiringing control, thermal shutdown, adjustable current limit, reference output and power good comparator.

The LTC3425 is available in a small, thermally enhanced 32-pin QFN package.

Applications

Handheld Computers
Point-of-Load Regulators
3.3V to 5V Conversion

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Ask a Question

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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 2

1ku List Price Starting From $5.81

Technical Documents 5

LTC3425: 5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter Data Sheet 08/24/2007

R415 Reliability Data 03/23/2018

DC616AB - Demo Manual 08/12/2013

Design Note 332: 4-Phase Monolithic Synchronous Boost Converter Delivers 2.5A with Output Disconnect in a 5mm x 5mm QFN Package 03/01/2004

Multiphase Power Conversion for Portable and Point-of-Load Boost Applications 09/01/2003

Design Resources 2

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
LTC3425EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3425EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3425EUH#PBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3425EUH#TRPBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3425EUH#PBF

PRODUCTION

LTC3425EUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3425EUH#PBF

PRODUCTION

LTC3425EUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Companion Parts 2

Parts	Product Life Cycle	Description
Silicon Oscillators2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

DC616B

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 5VOUT1 @ 2A, 5VOUT2 @ 1.5A

DC616B

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 5VOUT1 @ 2A, 5VOUT2 @ 1.5A

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Product Detail

Demonstration Circuit 616 is a synchronous, 4-phase boost converter using the LTC3425. It is capable of operating below 1V input. DC616A is set for 3.3V output. DC616B is set for 5V output. On each demo board, the left circuit gives higher efficiency and current rating; while the right circuit has smaller size and lower cost. The switching frequency is set at 1MHz per phase, minimizing inductor and capacitor size. A single resistor at RT pin sets the frequency. If desired, the LTC3425 can be synchronized to an external clock.

Resources

PDF

DC616AB - Demo Manual

761.00K

ZIP

DC616B - Design Files

927.00K

PDF

DC616B - Schematic

69.00K

DC616A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 3.3VOUT1 @ 2.25A, 3.3VOUT2 @ 1.8A

DC616A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 3.3VOUT1 @ 2.25A, 3.3VOUT2 @ 1.8A

Buy Now View Details

Product Detail

Resources

PDF

DC616AB - Demo Manual

761.00K

ZIP

DC616A - Design Files

917.00K

PDF

DC616A - Schematic

69.00K

DC616B

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 5VOUT1 @ 2A, 5VOUT2 @ 1.5A

DC616A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 3.3VOUT1 @ 2.25A, 3.3VOUT2 @ 1.8A

LTspice 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.

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.