LTC7871

RECOMMENDED FOR NEW DESIGNS

LTC7871

Six-Phase, Synchronous Bidirectional Buck or Boost Controller

RECOMMENDED FOR NEW DESIGNS

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Part Models 8

1ku List Price Starting From $4.24

Features

Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
Operates with External Gate Drivers and MOSFETs
V_HIGH Voltages Up to 100V; V_LOW Voltages Up to 60V
Synchronous Rectification: Up to 98% Efficiency
ADI-Proprietary Advanced Current Mode Control
±1% Voltage Regulation Accuracy Overtemperature
Accurate, Programmable Inductor Current Monitoring and Bidirectional Regulation

SPI Compliant Serial Interface
- Operation Status and Fault Report
- Programmable V_HIGH, V_LOW Margining
Phase-Lockable Frequency: 60kHz to 750kHz
Optional Spread Spectrum Modulation
Multiphase/Multi-ICs Operation Up to 24 Phases
Selectable CCM/DCM/Burst Mode Operation
Thermally Enhanced 64-Lead LQFP Package
AEC-Q100 Qualification in Progress

Additional Details

The LTC7871 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 V_HIGH-to-V_LOW and boost mode from V_LOW-to-V_HIGH 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 LTC7871 allows both batteries to supply energy to the load simultaneously by driving energy from either 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 an SPI-compliant serial interface, discontinuous or continuous mode of operation, OV/UV monitors, independent loop compensation for buck and boost operation, accurate inductor current monitoring and overcurrent protection.

The LTC7871 is available in a 64 pin 10mm × 10mm LWE package.

APPLICATIONS

Automotive 48V/12V Dual Battery Systems
Backup 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:

Other places you can find help

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 8

1ku List Price Starting From $4.24

Documentation

Technical Documents 1

LTC7871: Six-Phase, Synchronous Bidirectional Buck or Boost Controller Data Sheet (Rev.B) 03/20/2020

Design Resources 8

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
LTC7871ELWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871ELWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871HLWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871HLWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871ILWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871ILWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871JLWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7871JLWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC7871ELWE#PBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871ELWE#WPBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871HLWE#PBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871HLWE#WPBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871ILWE#PBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871ILWE#WPBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871JLWE#PBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7871JLWE#WPBF
Pin/Package Drawing
64-Lead LQFP (10mm x 10mm 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

Aug 15, 2022

- 22_0183

LTC7871 and LTC7872 data sheets updates

LTC7871ELWE#PBF

PRODUCTION

LTC7871ELWE#WPBF

LTC7871HLWE#PBF

PRODUCTION

LTC7871HLWE#WPBF

PRODUCTION

LTC7871ILWE#PBF

PRODUCTION

LTC7871ILWE#WPBF

LTC7871JLWE#PBF

PRODUCTION

LTC7871JLWE#WPBF

pdf

PCN22_0183_Form

xls

Material_Report

pdf

Datasheet Specification Comparison

pdf

Datasheet Specification Comparison

Filter by Model

Part Models

Product Lifecycle

PCN

Aug 15, 2022

- 22_0183

LTC7871 and LTC7872 data sheets updates

LTC7871ELWE#PBF

PRODUCTION

LTC7871ELWE#WPBF

LTC7871HLWE#PBF

PRODUCTION

LTC7871HLWE#WPBF

PRODUCTION

LTC7871ILWE#PBF

PRODUCTION

LTC7871ILWE#WPBF

LTC7871JLWE#PBF

PRODUCTION

LTC7871JLWE#WPBF

pdf

PCN22_0183_Form

xls

Material_Report

pdf

Datasheet Specification Comparison

pdf

Datasheet Specification Comparison

Software & Part Ecosystem

Evaluation Kit

DC2886A

LTC7871/LTC7060 48V-to-14V, 6-Phase, 2.5kW Bidirectional Supply/Charger

DC2886A

LTC7871/LTC7060 48V-to-14V, 6-Phase, 2.5kW Bidirectional Supply/Charger

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Product Detail

Demonstration circuit DC2886A is a high power, high efficiency six-phase bidirectional converter featuring the LTC7871 and LTC7060. The terminals labeled V_HIGH and V_LOW are either inputs or outputs depending on the direction of power flow. When the switch at SW1 is in the BUCK position, V_LOW provides a 14V output and V_HIGH is the input with a range of 30V to 70V. When the switch is in the BOOST position, V_HIGH provides a 48V output and V_LOW is the input with a range of 10V to 14V. The maximum V_LOW current is 180A in both directions. The maximum output power is 2.5kW when operating as a buck within the input voltage range. When operating as a boost, the maximum output power is 2.4kW when the input voltage is 14V. External airflow is required when operating at maximum power. The MOSFETs in each phase are driven by the LTC7060 half bridge driver. Each LTC7060 gate driver is placed next to the MOSFETs and receives a PWM signal from the LTC7871.

The inductor current for each phase is sensed with a low 1mΩ sense resistor using a highly accurate AC/DC current sensing architecture with low power dissipation. The LTC7871’s constant-current loop provides a DC current limit for the current flowing in or out of the V_LOW terminal depending on the state of the BUCK pin. This current can be programmed with the SETCUR pin and monitored with the IMON pin.

The DC2886A provides a SPI compatible serial port. With a DC2026C (Linduino^® One) demo board and QuikEval^™ software on a host computer, the user can:

Margin the regulated V_LOW or V_HIGH up or down.
Margin the DC current limit up or down with the SETCUR pin.
Adjust the frequency spread and modulation rate of the spread spectrum circuit, when spread spectrum is enabled.
Monitor the operational status and faults of the LTC7871.

Additional features of the DC2886A include:

Pin selectable light load operating modes
- Buck: FCM, pulse-skipping and Burst Mode^® Operation
- Boost: FCM and pulse-skipping
SYNC and CLKOUT pins
Optional jumper to enable spread spectrum modulation
RUN, FAULT, PGOOD and PWNEN pins
BUCK pin to externally control the direction of power flow
Footprint for an optional heatsink

Resources

PDF

DC2886A - Demo Manual (Rev.A)

1.27 M

PDF

DC2886A - Schematic

402.77 K

ZIP

DC2886A - Design File

7 M

DC2886A

LTC7871/LTC7060 48V-to-14V, 6-Phase, 2.5kW Bidirectional Supply/Charger

Tools & Simulations

LTspice 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.