LTC3646
LTC3646-1

Name: LTC3646
Brand: Analog Devices
Price: 4.33 USD
Availability: InStock

PRODUCTION

40V, 1A Synchronous Step-Down Converter

Data Sheet Product Selection Table

Part Models: 24
1ku List Price: Starting From $4.33

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Overview

Wide Input Voltage Range: 4.0V to 40V
1A Guaranteed Output Current
High Efficiency: Up to 95%
Wide Output Voltage Range
- LTC3646: 2.0V to 30V
- LTC3646-1: 0.6V to 15V
±1% Accurate Reference Voltage
Internal or External Compensation
Switching Frequency Adjustable and Synchronizable: 200kHz to 3MHz
Selectable High Efficiency Burst Mode^® Operation or Forced Continuous Mode
14 Lead 3mm × 4mm DFN or Thermally Enhanced
16-Lead MSOP Packages

Part Models: 24
1ku List Price: Starting From $4.33

Documentation

Data Sheet 1

LTC3646: 40V, 1A Synchronous Step-Down Converter Data Sheet 08/21/2015

User Guide 2

DC1820A - Demo Manual 02/05/2013

DC1731A - Demo Manual 01/29/2013

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
LTC3646EDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EDE-1#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EDE-1#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646EMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HDE-1#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HDE-1#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646HMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IDE-1#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IDE-1#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3646IMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report
LTC3646EDE#PBF	PRODUCTION
LTC3646EDE#TRPBF	PRODUCTION
LTC3646EMSE#PBF	PRODUCTION
LTC3646EMSE#TRPBF	PRODUCTION
LTC3646HDE#PBF	PRODUCTION
LTC3646HDE#TRPBF	PRODUCTION
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description
LTC3646EDE#PBF	PRODUCTION
LTC3646EDE#TRPBF	PRODUCTION
LTC3646EDE-1#PBF	PRODUCTION
LTC3646EDE-1#TRPBF	PRODUCTION
LTC3646HDE#PBF	PRODUCTION
LTC3646HDE#TRPBF	PRODUCTION
LTC3646HDE-1#PBF	PRODUCTION
LTC3646HDE-1#TRPBF	PRODUCTION
LTC3646IDE#PBF	PRODUCTION
LTC3646IDE#TRPBF	PRODUCTION
LTC3646IDE-1#PBF	PRODUCTION
LTC3646IDE-1#TRPBF	PRODUCTION
Nov 8, 2021 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Other
LTC3646EDE#PBF	PRODUCTION
LTC3646EDE#TRPBF	PRODUCTION
LTC3646EDE-1#PBF	PRODUCTION
LTC3646EDE-1#TRPBF	PRODUCTION
LTC3646EMSE#PBF	PRODUCTION
LTC3646EMSE#TRPBF	PRODUCTION
LTC3646EMSE-1#PBF	PRODUCTION
LTC3646EMSE-1#TRPBF	PRODUCTION
LTC3646HDE#PBF	PRODUCTION
LTC3646HDE#TRPBF	PRODUCTION
LTC3646HDE-1#PBF	PRODUCTION
LTC3646HDE-1#TRPBF	PRODUCTION
LTC3646HMSE#PBF	PRODUCTION
LTC3646HMSE#TRPBF	PRODUCTION
LTC3646HMSE-1#PBF	PRODUCTION
LTC3646HMSE-1#TRPBF	PRODUCTION
LTC3646IDE#PBF	PRODUCTION
LTC3646IDE#TRPBF	PRODUCTION
LTC3646IDE-1#PBF	PRODUCTION
LTC3646IDE-1#TRPBF	PRODUCTION
LTC3646IMSE#PBF	PRODUCTION
LTC3646IMSE#TRPBF	PRODUCTION
LTC3646IMSE-1#PBF	PRODUCTION
LTC3646IMSE-1#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report
LTC3646EDE-1#PBF	PRODUCTION
LTC3646EDE-1#TRPBF	PRODUCTION
LTC3646EMSE-1#PBF	PRODUCTION
LTC3646EMSE-1#TRPBF	PRODUCTION
LTC3646HDE-1#PBF	PRODUCTION
LTC3646HDE-1#TRPBF	PRODUCTION
LTC3646HMSE#PBF	PRODUCTION
LTC3646HMSE#TRPBF	PRODUCTION
LTC3646HMSE-1#PBF	PRODUCTION
LTC3646HMSE-1#TRPBF	PRODUCTION
LTC3646IMSE#PBF	PRODUCTION
LTC3646IMSE#TRPBF	PRODUCTION
LTC3646IMSE-1#PBF	PRODUCTION
LTC3646IMSE-1#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report
LTC3646EMSE#PBF	PRODUCTION
LTC3646EMSE#TRPBF	PRODUCTION
LTC3646EMSE-1#PBF	PRODUCTION
LTC3646EMSE-1#TRPBF	PRODUCTION
LTC3646HMSE#PBF	PRODUCTION
LTC3646HMSE#TRPBF	PRODUCTION
LTC3646HMSE-1#PBF	PRODUCTION
LTC3646HMSE-1#TRPBF	PRODUCTION
LTC3646IMSE#PBF	PRODUCTION
LTC3646IMSE#TRPBF	PRODUCTION
LTC3646IMSE-1#PBF	PRODUCTION
LTC3646IMSE-1#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LTC3646EMSE#PBF	PRODUCTION
LTC3646EMSE#TRPBF	PRODUCTION
LTC3646EMSE-1#PBF	PRODUCTION
LTC3646EMSE-1#TRPBF	PRODUCTION
LTC3646HMSE#PBF	PRODUCTION
LTC3646HMSE#TRPBF	PRODUCTION
LTC3646HMSE-1#PBF	PRODUCTION
LTC3646HMSE-1#TRPBF	PRODUCTION
LTC3646IMSE#PBF	PRODUCTION
LTC3646IMSE#TRPBF	PRODUCTION
LTC3646IMSE-1#PBF	PRODUCTION
LTC3646IMSE-1#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
Hot Swap Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3646
LTC3646-1

LTpowerCAD 4

Design tools for the following parts are available in LTpowerCAD:

LTC3646
LTC3646-1

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.

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

LTC3646 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1731A-A is a DC/DC converter demo board using the LTC3646 monolithic synchronous buck regulator in the DFN package. The input voltage range is from 4V to 40V. The output voltage range of LTC3646 is 2V to 30V. It can deliver up to 1A of output current. At light load conditions, DC1731A can operate in Burst Mode^® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/SYNC pin.

Resources

DC1731A - Demo Manual
1/29/2013

DC1731A - Design Files
1/29/2013

DC1731A - Schematic
1/29/2013

LTC3646-1 Demo Board (DFN) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1731A-B is a DC/DC converter demo board using the LTC3646-1 monolithic synchronous buck regulator in the DFN package. The input voltage range is from 4V to 40V. The output voltage range of LTC3646-1 is 0.6V to 15V. It can deliver up to 1A of output current. At light load conditions, DC1731A can operate in Burst Mode^® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646-1 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/SYNC pin.

Resources

DC1731A - Demo Manual
1/29/2013

DC1731A - Design Files
1/29/2013

DC1731A - Schematic
1/29/2013

LTC3646 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, VOUT = 3.3V or 5V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1820A-A/1820A-B is a step-down DC/DC converter using LTC3646/LTC3646-1 monolithic synchronous buck regulator. The input voltage range is from 4V to 40V. The output voltage range of LTC3646 is 2V to 30V, for LTC3646-1 is 0.6V to 15V. It can deliver up to 1A of output current. At light load conditions, DC1820A can operate in Burst Mode^® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646/LTC3646-1 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/ SYNC pin. The LTC3646/LTC3646-1 data sheet must be read in conjunction with this demo manual prior to working on or modifying demonstration circuit 1820A.

Resources

DC1820A - Schematic
3/29/2013

DC1820A - Design Files
3/29/2013

DC1820A - Demo Manual
2/5/2013

LTC3646-1 Demo Board (MSOP) | 4V ≤ VIN ≤ 40V, VOUT= 3.3V or 5V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1820A-A/1820A-B is a step-down DC/DC converter using LTC3646/LTC3646-1 monolithic synchronous buck regulator. The input voltage range is from 4V to 40V. The output voltage range of LTC3646 is 2V to 30V, for LTC3646-1 is 0.6V to 15V. It can deliver up to 1A of output current. At light load conditions, DC1820A can operate in Burst Mode® operation to improve the efficiency. The user can choose to use internal or external compensation. The switching frequency of LTC3646/LTC3646-1 is programmable from 200kHz to 3MHz. It can be synchronized to an external clock through the MODE/ SYNC pin. The LTC3646/LTC3646-1 data sheet must be read in conjunction with this demo manual prior to working on or modifying demonstration circuit 1820A.