LTC3871-1

LTC3871/LTC3871-1 Bidirectional PolyPhase Synchronous Buck or Boost Controller FEATURES nn Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current nn VHIGH Voltages Up to 100V nn VLOW Voltages Up to 30V nn Synchronous Rectification: Up to 97% Efficiency nn ADI-Proprietary Advanced Current Mode Control nn ±1% Voltage Regulation Accuracy Over Temperature nn Accurate, Programmable Output Current Monitoring and Regulation for Both Buck and Boost Operation nn Selectable Buck and Boost Current Sense Limits nn Programmable DRVCC/EXTVCC Optimizes Efficiency nn Programmable VHIGH UV and OV Thresholds nn Programmable VLOW OV Threshold nn Phase-Lockable Frequency: 60kHz to 460kHz nn Multiphase/Multi-ICs Operation Up to 12 Phases nn Selectable CCM/DCM Modes nn Thermally Enhanced 48-Lead LQFP Package APPLICATIONS nn Automotive 48V/12V Dual Battery Systems nn Backup Power Systems DESCRIPTION The LTC®3871/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 o...