Analog Devices LTC3871-1

Description

The LTC®3871/LTC3871-1 is a high performance bidirectionalbuck 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.

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

Typical applications

• Automotive 48V/12V Dual Battery Systems
• Backup Power Systems

More information

• Datasheet
• IC product information