LTC3871
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LTC3871

Bidirectional PolyPhase Synchronous Buck or Boost Controller

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LTspice LTC3871 - Step-Down (Buck) Regulators Download 8.64 KB LTspice LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Buck Mode) Converter (30-75V to 12V @ 30A) Download 12 KB LTspice LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Boost Mode) Converter (10-13V to 48V @ 7.5A) Download 12.08 KB
Part Models 12
1ku List Price Starting From $6.36
Features
  • 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
  • ADI-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
  • 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
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC3871/LTC3871-1 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/LTC3871-1 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. The LTC3871 and LTC3871-1 have different current limit foldback characteristics.

Applications

  • Automotive 48V/12V Dual Battery Systems
  • Backup Power Systems
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file View Data Sheet (Rev.C)
Documentation View All Documentation
LTspice LTC3871 - Step-Down (Buck) Regulators Download 8.64 KB LTspice LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Buck Mode) Converter (30-75V to 12V @ 30A) Download 12 KB LTspice LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Boost Mode) Converter (10-13V to 48V @ 7.5A) Download 12.08 KB
Part Models 12
1ku List Price Starting From $6.36
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LTC3871

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UPDATED 04/05/2024
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LTC3871: Bidirectional PolyPhase Synchronous Buck or Boost Controller Data Sheet (Rev.C)

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UPDATED 11/22/2016
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LTC3871: 双方向PolyPhase同期整流式降圧/昇圧コントローラ データシート

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UPDATED 03/26/2018
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UPDATED 09/01/2016
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DC2348A - Demo Manual redirect icon

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UPDATED 10/12/2016
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48V/12V Dual Battery Automotive Systems Require Bi-Directional DC/DC Controllers for Optimum Performance redirect icon

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Documentation

Product Selector Card 2

High Voltage Non-Isolated Devices
80V to 150V Non-Isolated DC/DC

Thought Leadership Page 1

Sensor, Power Management, and Bus Solutions as Drivers of Global Megatrends

Analog Dialogue 1

How to Create a Dual-Output Voltage Rail with Source and Sink Functionality for ATE Applications

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2

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Video

2017-09-18

100V, Bidirectional Multiphase Synchronous Buck or Boost Controller

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Video

2017-09-18

LTC3871 Bidirectional PolyPhase® Synchronous Buck or Boost Controller - Video Product Brief

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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
LTC3871ELXE#PBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ELXE-1#PBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ELXE-1#TRPBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871HLXE#3ZZPBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871HLXE#PBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871HLXE#WPBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871HLXE-1#PBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ILXE#PBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ILXE#WPBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ILXE-1#3OZPBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ILXE-1#3ZZPBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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LTC3871ILXE-1#PBF 48-Lead LQFP (7mm x 7mm w/ EP) external-link
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Jun 24, 2021

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LTC3871ELXE-1#PBF

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LTC3871ILXE#PBF

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Software & Part Ecosystem

Parts Product Life Cycle Description

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Evaluation Kits 2

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DC2348A-B

LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 30A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 7.5A

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DC2348A-B

LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 30A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 7.5A

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DC2348A-B
LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 30A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 7.5A
Buy Now View Details

Product Detail

Demonstration circuit 2348A is a high power high efficiency bi-directional synchronous buck or boost converter featuring the LTC3871 and is available in two versions. The DC2348A-A operates with two each LTC3871 devices with four phases and the DC2348A-B utilizes one LTC3871 device with two phases.

Resources

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DC2348A - Demo Manual Download

1.00M

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DC2348A-B - Design Files Download

5.00M

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DC2348A-B - Schematic Download

67.00K

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DC2348A-A

LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 60A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 15A

zoom

DC2348A-A

LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 60A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 15A

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Download

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DC2348A-A
LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 60A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 15A
Buy Now View Details

Product Detail

Demonstration circuit 2348A is a high power high efficiency bi-directional synchronous buck or boost converter featuring the LTC3871 and is available in two versions. The DC2348A-A operates with two each LTC3871 devices with four phases and the DC2348A-B utilizes one LTC3871 device with two phases.

Resources

pdf icon

PDF

DC2348A - Demo Manual Download

1.00M

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PDF

DC2348A-A - Schematic Download

99.00K

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ZIP

DC2348A-A - Design Files Download

5.00M

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Evaluation Kits2

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DC2348A-B

LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 30A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 7.5A
evaluation kit item images

DC2348A-A

LTC3871HLXE#PBF Demo Board | Bidirectional Controller, Buck Mode: 30V ≤ VIN ≤ 75V, VOUT = 12V @ 60A; Boost Mode: 10V ≤ VIN ≤ 13V, VOUT = 48V @ 15A

Tools & Simulations 2

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.

spice tool Lt Spice

LTC3871 - Step-Down (Buck) Regulators Download

8.64 K

spice tool Lt Spice

LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Buck Mode) Converter (30-75V to 12V @ 30A) Download

12 K

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LTC3871 Demo Circuit - High Power PolyPhase Bi-Directional (Boost Mode) Converter (10-13V to 48V @ 7.5A) Download

12.08 K

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