LTC3866

RECOMMENDED FOR NEW DESIGNS

Current Mode Synchronous Controller for Sub Milliohm DCR Sensing

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $3.26

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Part Details

Sub Milliohm DCR Current Sensing
High Efficiency: Up to 95%
Selectable Current Sensing Limit
Programmable DCR Temperature Compensation
Die Overtemperature Thermal Shutdown
± 0.5% 0.6V Output Voltage Accuracy
Programmable Fixed Frequency 250kHz to 770kHz
High Speed Differential Remote Sense Amplifier
Wide Input Voltage Range: 4.5V to 38V
Output Voltage Range: 0.6V to 3.5V with Diffamp
Adjustable Soft-Start or Output Voltage Tracking
Foldback Output Current Limit
Short-Circuit Soft Recovery
Output Overvoltage Protection
24-Lead (4mm × 4mm) QFN and 24-Lead FE Packages

Part Models: 8
1ku List Price: Starting From $3.26

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
LTC3866EFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866EFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866IFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866IFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3866IUF#TRPBF	24-Lead QFN (4mm x 4mm 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
LTC3866EFE#PBF	PRODUCTION
LTC3866EFE#TRPBF	PRODUCTION
LTC3866EUF#PBF	PRODUCTION
LTC3866EUF#TRPBF	PRODUCTION
LTC3866IFE#PBF	PRODUCTION
LTC3866IFE#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
LTC3866EFE#PBF	PRODUCTION
LTC3866EFE#TRPBF	PRODUCTION
LTC3866IFE#PBF	PRODUCTION
LTC3866IFE#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3866EUF#PBF	PRODUCTION
LTC3866EUF#TRPBF	PRODUCTION
LTC3866IUF#PBF	PRODUCTION
LTC3866IUF#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
LTC3866IUF#PBF	PRODUCTION
LTC3866IUF#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
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 4

Models for the following parts are available in LTspice:

LTC3866

LTpowerCAD 1

LTC3866 Project - High Efficiency, Synchronous Step-Down Controller with Sub mΩ Inductor DCR Sensing (4.5-14V to 1.5 @ 30A)

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

LTC3866EUF Demo Board VIN = 4.5V to 14V, VOUT = 1.5V @ 30A

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Product Details

Demonstration circuit 1829A is a high efficiency, high density, synchronous buck converter with 4.5V to 14V input voltage range. It can supply a 30A maximum load current with a 1.5V output. This demo board utilizes the LTC3866EUF, a feature-rich single phase synchronous buck controller with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing. This board is setup with 0.32mΩ DCR inductor. The temperature compensation function guarantees accurate current limit over a wide temperature range with DCR sensing. The LTC3866 is suitable for operation from an input voltage of 4.5V to 38V and output voltages up to 3.5V.

Resources

DC1829A - Demo Board
1/25/2012

DC1829A - Design Files
1/25/2012

DC1829A - Schematic
1/25/2012

Reference Designs

View Detailed Reference Design

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