LTC3871 Series

Bidirectional PolyPhase Synchronous Buck or Boost Controller

Catalog

Bidirectional PolyPhase Synchronous Buck or Boost Controller

Part	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Type	Frequency - Switching [Min]	Frequency - Switching [Max]	Control Features	Mounting Type	Duty Cycle (Max) [Max]	Output Configuration	Output Phases	Function	Supplier Device Package	Package / Case	Topology	Frequency - Switching	Main Purpose	Regulator Topology	Voltage - Input [Min]	Voltage - Input [Max]	Outputs and Type	Outputs and Type	Board Type	Voltage - Output	Current - Output	Supplied Contents
Analog Devices LTC3871ILXE	-40 °C	125 °C	2	1.2 V	100 V	Transistor Driver	60 kHz	460 kHz	Current Limit Enable Frequency Control Phase Control Soft Start	Surface Mount	98 %	Positive	Programmable	Step-Down Step-Up	48-eLQFP (7x7)	48-LQFP Exposed Pad	Boost Buck
Analog Devices LTC3871ELXE	-40 °C	125 °C	2	1.2 V	100 V	Transistor Driver	60 kHz	460 kHz	Current Limit Enable Frequency Control Phase Control Soft Start	Surface Mount	98 %	Positive	Programmable	Step-Down Step-Up	48-eLQFP (7x7)	48-LQFP Exposed Pad	Boost Buck
Analog Devices DC2348A-B																		110 kHz	Bidirectional DC/DC	Boost Buck	10 V 30 V	13 V 75 V	Non-Isolated	1	Fully Populated	12 V 48 V	7.5 A 30 A	Board(s)
Analog Devices LTC3871ELXE#PBF	-40 °C	125 °C	2	1.2 V	100 V	Transistor Driver	60 kHz	460 kHz	Current Limit Enable Frequency Control Phase Control Soft Start	Surface Mount	98 %	Positive	Programmable	Step-Down Step-Up	48-eLQFP (7x7)	48-LQFP Exposed Pad	Boost Buck

Catalog

Bidirectional PolyPhase Synchronous Buck or Boost Controller

Key Features

• Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current

• VHIGHVoltages Up to 100V

• VLOWVoltages 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/EXTVCCOptimizes Efficiency

• Programmable VHIGHUV and OV Thresholds

• Programmable VLOWOV 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

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3871/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-VLOWand boost mode from VLOW-to-VHIGHdepending 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.ApplicationsAutomotive 48V/12V Dual Battery SystemsBackup Power Systems