LTC3871
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3871

Bidirectional PolyPhase Synchronous Buck or Boost Controller

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
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
Part Models 12
1ku List Price Starting From $6.36

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Part Models

Product Lifecycle

PCN

Jun 24, 2021

- 21_0046

Transfer of LQFP and LQFP_EP from AEM to AET

LTC3871ELXE#PBF

PRODUCTION

LTC3871ELXE-1#PBF

PRODUCTION

LTC3871ILXE#PBF

PRODUCTION

LTC3871ILXE-1#PBF

PRODUCTION

Dec 17, 2021

- 21_0046

Transfer of LQFP and LQFP_EP from AEM to AET

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jun 24, 2021

- 21_0046

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Transfer of LQFP and LQFP_EP from AEM to AET

LTC3871ELXE#PBF

PRODUCTION

LTC3871ELXE-1#PBF

PRODUCTION

LTC3871ILXE#PBF

PRODUCTION

LTC3871ILXE-1#PBF

PRODUCTION

Dec 17, 2021

- 21_0046

arrow down

Transfer of LQFP and LQFP_EP from AEM to AET

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

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

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

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.

reference details image

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

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

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.

Tools & Simulations

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.

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