LTC3611

PRODUCTION

LTC3611

10A, 32V 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

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Part Models 4

1ku List Price Starting From $11.60

Features

10A Output Current
Wide V_IN Range = 4.5V to 32V (36V Maximum)
Internal N-Channel MOSFETs
True Current Mode Control
Optimized for High Step-Down Ratios
t_0N(MIN) ≤ 100ns
Extremely Fast Transient Response
Stable with Ceramic C_OUT
±1% 0.6V Voltage Reference
Power Good Output Voltage Monitor
Adjustable On-Time/Switching Frequency (>1MHz)
Adjustable Current Limit
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Low Shutdown I_Q: 15μA
Available in a 9mm × 9mm 64-Pin QFN Package

Additional Details

The LTC3611 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 10A output current from a 4.5V to 32V (36V maximum) input supply. It uses a constant on-time valley current mode 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 LTC3611 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 LTC3611 is available in a compact 9mm × 9mm QFN package.

Applications

Point of Load Regulation
Distributed Power Systems

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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 4

1ku List Price Starting From $11.60

Technical Documents 4

LTC3611: 10A, 32V Monolithic Synchronous Step-Down DC/DC Converter Data Sheet 06/04/2010

R546 Reliability Data 03/23/2018

DC1318A - Demo Manual 11/13/2009

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
LTC3611EWP#PBF	64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3611EWP#TRPBF	64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3611IWP#PBF	64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3611IWP#TRPBF	64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3611EWP#PBF
Pin/Package Drawing
64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3611EWP#TRPBF
Pin/Package Drawing
64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3611IWP#PBF
Pin/Package Drawing
64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3611IWP#TRPBF
Pin/Package Drawing
64-Lead QFN (9mm x 9mm x 0.9mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

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Surge Stopper, Overvoltage, and Overcurrent Protection1
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Alternative Parts 1

Parts	Product Life Cycle	Description
LTC3610	PRODUCTION	24V, 12A Monolithic Synchronous Step-Down DC/DC Converter

DC1318A

LTC3611EWP Demo Board | 9V ≤ VIN ≤ 32V, VOUT = 1.5V to 3.3V @ up to 10A

DC1318A

LTC3611EWP Demo Board | 9V ≤ VIN ≤ 32V, VOUT = 1.5V to 3.3V @ up to 10A

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Product Detail

Demonstration circuit 1318 is a Synchronous Step-Down Controller featuring the LTC3611, the high efficiency, high density DC/DC regulator. The input voltage range of DC1318 is from 9V to 32V and the output voltage is jumper selectable from 1.5V to 3.3V, although LTC3611 has an input range from 4.5V to 32V and the output voltage range is from 0.6V. The rated load current is 10A.

Resources

PDF

DC1318A - Schematic

41.00K

PDF

DC1318A - Demo Manual

1.00M

ZIP

DC1318A - Design Files

843.00K

DC1318A

LTC3611EWP Demo Board | 9V ≤ VIN ≤ 32V, VOUT = 1.5V to 3.3V @ up to 10A

LTspice 2

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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.