LTC7871

RECOMMENDED FOR NEW DESIGNS

Six-Phase, Synchronous Bidirectional Buck or Boost Controller

Analog Devices LTC7871 Product Info

10 February 2026 6

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

Part details & applications

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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