LTC3867

RECOMMENDED FOR NEW DESIGNS

LTC3867

Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

RECOMMENDED FOR NEW DESIGNS

High Efficiency Synchronous Step-Down Controller slide

High Efficiency Synchronous Step-Down Controller

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Part Models 4

1ku List Price Starting From $3.19

Features

V_IN Range: 4V to 38V
V_OUT Range: 0.6V to 14V
Nonlinear Control Architecture Minimizes Output Transient Excursions (Optional)
Programmable DCR Temperature Compensation
±0.75% 0.6V Voltage Reference
Fixed Frequency Range of 200kHz to 1.2MHz
PLL Frequency Synchronization
R_SENSE or DCR Current Sensing
Differential Remote Output Voltage Sense
Supports Smooth Start-Up into Pre-Biased Outputs
Programmable Soft-Start or V_OUTTracking
Hiccup Mode/Soft Recovery from Output Overcurrent
24-Lead (4mm × 4mm) QFN Package

Additional Details

The LTC3867 is a current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. Output voltage transient excursions are minimized by use of a nonlinear control architecture to eliminate clock latency issues.

The maximum current sense voltage is programmable from 30mV to 75mV, allowing the use of either a discrete sense resistor or the inductor DCR as the sensing element. Programmable DCR temperature compensation allows constant current limit regardless of inductor temperature. Programmable inductor temperature-based thermal shutdown protects the power components from thermal stress. Soft recovery from output shorts or overcurrent minimizes output overshoot.

The LTC3867 features a precision 0.6V reference and can regulate output voltages up to 14V from a wide 4V to 38V input supply range. The LTC3867 includes a high speed differential remote sense amplifier. Burst Mode^® operation, continuous and pulse-skipping modes are supported. The LTC3867 is available in a 24-lead (4mm × 4mm) QFN package.

Applications

Automotive Systems
Telecom Systems
Industrial Equipment
Distributed DC Power Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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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 $3.19

Technical Documents 4

LTC3867: Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control Data Sheet 07/26/2011

R526 Reliability Data 03/26/2018

DC1771A - Demo Manual 10/07/2011

DC1928A - Demo Manual 05/21/2013

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
LTC3867EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3867EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3867IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3867IUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3867EUF#PBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3867EUF#TRPBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3867IUF#PBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3867IUF#TRPBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3867EUF#PBF

PRODUCTION

LTC3867EUF#TRPBF

PRODUCTION

LTC3867IUF#PBF

PRODUCTION

LTC3867IUF#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3867EUF#PBF

PRODUCTION

LTC3867EUF#TRPBF

PRODUCTION

LTC3867IUF#PBF

PRODUCTION

LTC3867IUF#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

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Surge Stopper, Overvoltage, and Overcurrent Protection1
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DC1928A

LTC3867EUF Demo Board | 18V ≤ VIN ≤ 36V; VOUT = 12V @ 12A

DC1928A

LTC3867EUF Demo Board | 18V ≤ VIN ≤ 36V; VOUT = 12V @ 12A

Buy Now View Details

Product Detail

Demonstration circuit 1928A is a single output synchronous buck converter featuring the LTC3867EUF in a 24-lead 4mm x 4mm QFN package. The input voltage range is from 18V to 36V.

Resources

PDF

DC1928A - Schematic

66.00K

ZIP

DC1928A - Design Files

957.00K

PDF

DC1928A - Demo Manual

1.00M

DC1771A

LTC3867EUF Demo Board | 4.5 ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

DC1771A

LTC3867EUF Demo Board | 4.5 ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

Buy Now View Details

Product Detail

Demonstration circuit 1771A is a single output synchronous buck converter featuring the LTC3867EUF with a 24-lead 4mm × 4mm QFN package. The input voltage range is from 4.5V to 14V and it provides 1.5V at 15A at the output. The DC1771A is configured with a sense resistor.

DCR sensing circuit is optional. Using the inductor’s DCR as the sense element instead of the on-board sense resistor saves cost and board space while improving full-load efficiency over 2%, though the sense resistor provides a more accurate current limit.

Resources

PDF

DC1771A - Demo Manual

718.00K

ZIP

DC1771A - Design Files

1.00M

PDF

DC1771A - Schematic

67.00K

DC1928A

LTC3867EUF Demo Board | 18V ≤ VIN ≤ 36V; VOUT = 12V @ 12A

DC1771A

LTC3867EUF Demo Board | 4.5 ≤ VIN ≤ 14V, VOUT = 1.5V @ 15A

LTspice 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.

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.

Lt Spice

LTC3867 - Step-Down (Buck) Regulators

4.09 K

LTpowerCAD 4

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.

LTpowerCAD download and documentation