LTC3608

PRODUCTION

LTC3608

18V, 8A Monolithic Synchronous Step-Down DC/DC Converter

PRODUCTION

High Efficiency Step-Down Converter slide

Efficiency and Power Loss vs Load Current slide

Efficiency and Power Loss vs Load Current

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

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 $8.95

Features

8A Output Current
Wide V_IN Range = 4V to 18V
Internal N-Channel MOSFETs
True Current Mode Control
Optimized for High Step-Down Ratios
t_ON(MIN) ≤ 100nsec
Extremely Fast Transient Response
Stable with Ceramic C_OUT
±1% 0.6V Voltage Reference
Power Good Output Voltage Monitor
Adjustable On-Time/Switching Frequency
Adjustable Current Limit
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Low Shutdown I_Q: 15μA
Available in a 7mm × 8mm 52-Lead QFN Package

Additional Details

The LTC3608 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 8A output current from a 4V to 18V (20V maximum) input supply. It uses a valley current control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is compensated for variations in V_IN and V_OUT.

The LTC3608 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The LTC3608 is available in a compact 7mm × 8mm QFN package.

Applications

Point of Load Regulation
Distributed Power Systems

View All Documentation

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 $8.95

Technical Documents 4

LTC3608: 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter Data Sheet 06/04/2010

R546 Reliability Data 03/23/2018

DC1320A - Demo Manual 05/14/2012

Design Note 457: Monolithic Synchronous Step-Down Regulator Delivers up to 12A from a Wide Input Voltage Range 01/01/2009

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
LTC3608EWKG#PBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3608EWKG#TRPBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3608IWKG#PBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3608IWKG#TRPBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3608EWKG#PBF
Pin/Package Drawing
52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3608EWKG#TRPBF
Pin/Package Drawing
52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3608IWKG#PBF
Pin/Package Drawing
52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3608IWKG#TRPBF
Pin/Package Drawing
52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

Companion Parts 3

Parts	Product Life Cycle	Description
Digital Power System Managers1
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
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

DC1320A-A

LTC3608EWKG Demo Board | Monolithic, 5V ≤ VIN ≤ 20V, VOUT = 1.5V/1.8V/2.5V/3.3V @ 8A

DC1320A-A

LTC3608EWKG Demo Board | Monolithic, 5V ≤ VIN ≤ 20V, VOUT = 1.5V/1.8V/2.5V/3.3V @ 8A

Buy Now View Details

Product Detail

Demonstration circuit 1320 is a high power density step-down DC/DC converter featuring the LTC3608EWKG (DC1320A-A) or the LTC3609EWKG (DC1320A-B) high current, high input voltage monolithic DC/DC step-down converter. The input voltage of the DC1320A-A is from 5V to 20V and it provides a jumper-selectable output voltage of 1.5V, 1.8V, 2.5V, or 3.3V @ 8A.

Resources

ZIP

DC1320A - Design Files

2.00M

PDF

DC1320A - Schematic

36.00K

PDF

DC1320A - Demo Manual

178.00K

DC1320A-A

LTC3608EWKG Demo Board | Monolithic, 5V ≤ VIN ≤ 20V, VOUT = 1.5V/1.8V/2.5V/3.3V @ 8A

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.

Lt Spice

LTC3608 - Step-Down (Buck) Regulators

2.58 K

Lt Spice

LTC3608 Demo Circuit - 18V, 8A Synchronous Step-Down Converter (12V to 2.5V @ 8A)

4.00K

Arrow/Terasic SoCKit Development Kit

Download

Arrow/Terasic SoCKit Development Kit

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design

Part Used 7

LT3080

LTC3026

LTC3025-1
LTC3025-2
LTC3025-3
LTC3025-4

LT3085

LTC3614

LTC3608

LTC3600

Altera Cyclone V GT FPGA Development Kit

DK-DEV-5CGTD9N Power Tree No TI DDR Regulator

Download

Altera Cyclone V GT FPGA Development Kit

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design

Part Used 8

LTC3025-1
LTC3025-2
LTC3025-3
LTC3025-4

LT3009

LTC3855

LT3085

LT3022

LTC3605

LTC3608

LTC3613

Terasic DE1-SoC Development Kit

Download

Terasic DE1-SoC Development Kit

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design

Part Used 6

LT3085

LT3080

LTC3633

LTM4624

LTC3605

LTC3608

Altera Cyclone V E Development Kit

Download

Altera Cyclone V E Development Kit

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design