LTC3871 Series

Bidirectional PolyPhase Synchronous Buck or Boost Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Bidirectional PolyPhase Synchronous Buck or Boost Controller

Part	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Supplier Device Package	Output Configuration	Control Features	Duty Cycle (Max) [Max]	Package / Case	Output Phases	Function	Frequency - Switching [Max]	Frequency - Switching [Min]	Mounting Type	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Number of Outputs	Output Phases	Contents	Main Purpose	Regulator Topology	Voltage - Input [Max]	Voltage - Input [Min]	Outputs and Type	Voltage - Output	Current - Output	Frequency - Switching	Supplied Contents	Board Type	Outputs and Type
Analog Devices Inc./Maxim Integrated LTC3871ILXE-1#PBF	Boost Buck	125 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad	12	Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2
Analog Devices Inc./Maxim Integrated LTC3871HLXE-1#PBF	Boost Buck	150 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad	12	Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2
Analog Devices Inc./Maxim Integrated LTC3871ELXE-1#PBF	Boost Buck	125 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad	12	Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2
Analog Devices Inc./Maxim Integrated LTC3871ILXE	Boost Buck	125 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad		Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2	Programmable
Analog Devices Inc./Maxim Integrated LTC3871HLXE#PBF	Boost Buck	150 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad		Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2	Programmable
Analog Devices Inc./Maxim Integrated LTC3871ELXE	Boost Buck	125 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad		Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2	Programmable
Analog Devices Inc./Maxim Integrated LTC3871ILXE#PBF	Boost Buck	125 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad		Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2	Programmable
Analog Devices Inc./Maxim Integrated DC2348A-A																			Board(s)	DC/DC Bidirectional	Boost Buck	13 V 75 V	10 V 30 V	1 Non-Isolated Output	12V 48V	15 A 60 A	110 kHz
Analog Devices Inc./Maxim Integrated DC2348A-B																			Board(s)	DC/DC Bidirectional	Boost Buck	13 V 75 V	10 V 30 V	1 Non-Isolated Output Non-Isolated	12V 48V	7.5 A 30 A	110 kHz	Board(s)	Fully Populated	1
Analog Devices Inc./Maxim Integrated LTC3871ELXE#PBF	Boost Buck	125 °C	-40 °C	Transistor Driver	48-eLQFP (7x7)	Positive	Current Limit Enable Frequency Control Phase Control Soft Start	98 %	48-LQFP Exposed Pad		Step-Down Step-Up	460 kHz	60 kHz	Surface Mount	1.2 V	100 V	2	Programmable

Catalog

Bidirectional PolyPhase Synchronous Buck or Boost Controller

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