Features

• Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
• V_HIGH Voltages Up to 100V
• V_LOW Voltages Up to 30V
• Synchronous Rectification: Up to 97% Efficiency
• LTC-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
• Engineered for Diagnostic Coverage in ISO26262 Systems
• Programmable DRV_CC/EXTV_CC Optimizes Efficiency
• Programmable V_HIGH UV and OV Thresholds
• Programmable V_LOW 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 Application

Description

The LTC®3871 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 LTC3871 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.