LTC3649

RECOMMENDED FOR NEW DESIGNS

60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $6.72

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Part Details

Wide V_IN Range: 3.1V to 60V
Wide V_OUT Range: 0V to (V_IN – 0.5V)
Single Resistor V_OUT Programming
Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
95% Efficiency with 12V_IN and 5V_OUT
Regulated I_Q: 440μA, Shutdown I_Q: 18μA
Accurate Current Monitoring (±4%) without Sense Resistor
Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
Accurate Programmable Output Current
Input Voltage Regulation for MPPT Applications
±0.8% Output Voltage Accuracy
Peak Current Mode Operation
Programmable Wire Drop Compensation
Burst Mode^® Operation, Forced Continuous Mode
Internal Compensation and Programmable Soft-Start
Overtemperature Protection
Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages

Part Models: 8
1ku List Price: Starting From $6.72

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
LTC3649EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3649IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3649EFE#PBF	PRODUCTION
LTC3649EFE#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
LTC3649EFE#PBF	PRODUCTION
LTC3649EFE#TRPBF	PRODUCTION
LTC3649IFE#PBF	PRODUCTION
LTC3649IFE#TRPBF	PRODUCTION
May 17, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LTC3649EFE#PBF	PRODUCTION
LTC3649EFE#TRPBF	PRODUCTION
LTC3649EUFD#PBF	PRODUCTION
LTC3649EUFD#TRPBF	PRODUCTION
LTC3649IFE#PBF	PRODUCTION
LTC3649IFE#TRPBF	PRODUCTION
LTC3649IUFD#PBF	PRODUCTION
LTC3649IUFD#TRPBF	PRODUCTION
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3649EUFD#PBF	PRODUCTION
LTC3649EUFD#TRPBF	PRODUCTION
LTC3649IFE#PBF	PRODUCTION
LTC3649IFE#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
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Parts	Product Life Cycle	Description
LTC3623	RECOMMENDED FOR NEW DESIGNS	15V, ±5A Rail-to-Rail Synchronous Buck Regulator
LTC7149	RECOMMENDED FOR NEW DESIGNS	60V, 4A Synchronous Step-Down Regulator for Inverting Outputs

Tools & Simulations

LTspice 6

Models for the following parts are available in LTspice:

LTC3649

LTpowerCAD 1

LTC3649 Project - 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output (4-60V to 3.3V @ 4A)

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC3649EUFD Demo Board | 4V ≤ VIN ≤ 60V; VOUT = 3.3V or 5V @ 4A

Buy Now View Details

Product Details

Demonstration circuit 2112A is a high input voltage, high efficiency synchronous monolithic buck converter featuring the LTC3649 in a 28-lead UFD package. The DC2112A has wide input voltage range from 3.1V up to 60V. The output voltage of the DC2112A can be set as to 3.3V or 5V. However, the “USER SELECT” option of DC2112A allows output voltage to be as high as input voltage minus 0.5V, with certain modifications. DC2112A is capable of delivering up to 4A of output current. DC2112A supports three operation modes: Fixed-Frequency modulation and Burst Mode, user can synchronize it with an external clock also. Fixed-Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

Resources

DC2112A - Schematic
4/5/2019

DC2112A - Design Files
4/15/2019

DC2112A - Demo Board Manual
2/2/2018

LTC3649 Demo Board | Synchronous Buck, 3.1V ≤ VIN ≤ 60V, VOUT = 3.3V/5V @ 4A

Buy Now View Details

Product Details

Demonstration circuit 2113A is a high input voltage, high efficiency synchronous monolithic buck converter featuring the LTC3649. The DC2113A has wide input voltage range from 3.1V up to 60V. The output voltage of the DC2113A can be set as to 3.3V or 5V. However, “USER SELECT” option of DC2113A allows output voltage to be as high as input voltage minus 0.5V, with certain modifications. DC2113A is capable of delivering up to 4A of output current. DC2113A supports three operation modes: Fixed-Frequency modulation, Burst Mode^® operation and the user can synchronize it with external clock also. Fixed-Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

Resources

DC2113A - Schematic
2/16/2016

DC2113A - Design Files
4/21/2016

DC2113A - Demo Manual
2/17/2016

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LTC3649

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 3

Technical Articles 2

Video 2

Software Resources

Can't find the software or driver you need?

Hardware Ecosystem

Tools & Simulations

LTspice 6

Models for the following parts are available in LTspice:

LTpowerCAD 1

Evaluation Kits

Product Details

Resources

Product Details

Resources

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