Alternative Parts
Overview
Features and Benefits
- Wide VIN Range: 3.1V to 60V
- Wide VOUT Range: 0V to (VIN – 0.5V)
- Single Resistor VOUT Programming
- Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
- 95% Efficiency with 12VIN and 5VOUT
- Regulated IQ: 440μA, Shutdown IQ: 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
Product Details
The LTC3649 is a high efficiency 60V, 4A synchronous monolithic step-down regulator. The regulator features a single resistor programmable output voltage, internal compensation and high efficiencies over a wide VOUT range.
The step-down regulator operates from an input voltage range of 3.1V to 60V and provides an adjustable rail-to-rail output range from (VIN – 0.5V) to ground while delivering up to 4A of output current. The switching frequency is also adjusted with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/SYNC pin can also be used to allow the user to synchronize the switching frequency to an external clock.
The LTC3649 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection. It also features programmable output current limit, current monitoring and input voltage regulation.
Applications
- Industrial Applications
- Automotive Applications
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
-
R526 Reliability Data3/26/2018
-
DC2112A - Demo Board Manual2/2/2018
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DC2113A - Demo Manual2/17/2016
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DC2112A - Schematic4/5/2019
-
60 V Input Monolithic Converter Powers Critical Circuits Without Supercaps or Other Additional Components2/5/2019
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DN550 - 60V, 4A Synchronous Monolithic Step-Down Regulator Has Rail-to Rail Operation4/5/2016
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DN1014 - 80µA Quiescent Current Synchronous Step-Down Controller Extends Battery Life in Automotive Applications8/22/2007
Tools & Simulations
LTspice
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.

LTspice Simulations
Models for the following parts are available in LTspice:
LTpowerCAD
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

Design tools for the following parts are available in LTpowerCAD:
Product Recommendations
LTC3649 Companion Parts
Recommended Related Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
---|---|---|---|---|
LTC3649EFE#PBF | Material Declaration | Reliability Data | 28-Lead TSSOP w/ EP | |
LTC3649EFE#TRPBF | Material Declaration | Reliability Data | 28-Lead TSSOP w/ EP | |
LTC3649EUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
LTC3649EUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
LTC3649IFE#PBF | Material Declaration | Reliability Data | 28-Lead TSSOP w/ EP | |
LTC3649IFE#TRPBF | Material Declaration | Reliability Data | 28-Lead TSSOP w/ EP | |
LTC3649IUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
LTC3649IUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
Wafer Fabrication Data | R526 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Sample & Buy
Ordering FAQs
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Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.