Analog Devices®3871 Bidirectional PolyPhase® Synchronous Buck or Boost Controller

Analog Devices LTC3871 is a high-performance bidirectional buck or boost switching regulator controller that operates in either buck or boost mode on demand. The LTC3871 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 48 V / 12 V 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.

The LTC3871's 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.

Video:  LTC3871 Bidirectional Multi-Phase Synchronous Buck or Boost Controller

Features
Unique architecture allows dynamic regulation of input voltage, output voltage, or current VHIGH voltages up to 100 V VLOW voltages up to 30 V Synchronous rectification: up to 97% efficiency Analog Devices-proprietary advanced current mode control ±1% voltage regulation accuracy over temperature Selectable buck and boost current sense limits Engineered for diagnostic coverage in ISO26262 systems		Accurate, programmable output current monitoring, and regulation for both buck and boost operation Programmable DRVCC / EXTVCC optimizes efficiency Programmable VHIGH UV and OV thresholds Programmable VLOW OV threshold Phase-lockable frequency: 60 kHz to 460 kHz Multiphase / multi-ICs operation up to 12 phases Selectable CCM / DCM modes Thermally enhanced 48-lead LQFP package
Applications
Automotive 48 V / 12 V dual battery systems		Backup power systems