Overview

Features and Benefits

  • Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
  • VHIGH Voltages Up to 100V
  • VLOW Voltages Up to 30V
  • Synchronous Rectification: Up to 97% Efficiency
  • LTC-Proprietary Advanced Current Mode Control
  • ±1% Voltage Regulation Accuracy Over Temperature
  • Accurate, Programmable Output Current Monitoring and Regulation for Both Buck and Boost Operation
  • Selectable Buck and Boost Current Sense Limits
  • Engineered for Diagnostic Coverage in ISO26262 Systems
  • Programmable DRVCC/EXTVCC Optimizes Efficiency
  • Programmable VHIGH UV and OV Thresholds
  • Programmable VLOW OV Threshold
  • Phase-Lockable Frequency: 60kHz to 460kHz
  • Multiphase/Multi-ICs Operation Up to 12 Phases
  • Selectable CCM/DCM Modes
  • Thermally Enhanced 48-Lead LQFP Package

Product Details

The LTC3871 is a high performance bidirectional buck or boost switching regulator controller that operates in either buck or boost mode on demand. It regulates in buck mode from VHIGH-to-VLOW and boost mode from VLOW-to-VHIGH depending on a control signal, making it ideal for 48V/12V automotive dual battery systems. An accurate current programming loop regulates the maximum current that can be delivered in either direction. The LTC3871 allows both batteries to supply energy to the load simultaneously by converting energy from one battery to the other.

Its proprietary constant-frequency current mode architecture enhances the signal-to-noise ratio enabling low noise operation and provides excellent current matching between phases. Additional features include discontinuous or continuous mode of operation, OV/UV monitors, independent loop compensation for buck and boost operation, accurate output current monitoring and overcurrent protection.

Applications

  • Automotive 48V/12V Dual Battery Systems
  • Backup Power Systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

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.

LTspice

Models for the following parts are available in LTspice:

LTC3871

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.

LTPowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTC3871
LTC3871 Parallel
LTC3871(Boost)
LTC3871(Boost) Parallel
ltc3871(boost)Parallel
LTC3871(Buck)
LTC3871(Buck) Parallel
ltc3871(buck)Parallel

Product Recommendations

LTC3871 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.

Discussions

LTC3871 Discussions

LTC3871 not working
6 week(s) ago in Power By Linear
Re: LTC3871 for polyphase
10 week(s) ago in Power By Linear
LTC3871 for polyphase
10 week(s) ago in Power By Linear
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The USA 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. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Price Table Help

 

Evaluation Boards Pricing displayed is based on 1-piece.
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.