LTC7871 Series

Six-Phase, Synchronous Bidirectional Buck or Boost Controller

Catalog

Six-Phase, Synchronous Bidirectional Buck or Boost Controller

Part	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Output Phases	Package / Case	Duty Cycle (Max) [Max]	Mounting Type	Output Configuration	Serial Interfaces	Number of Outputs	Supplier Device Package	Control Features	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Function	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Current - Output	Voltage - Input [Max]	Voltage - Input [Min]	Board Type	Utilized IC / Part	Supplied Contents	Main Purpose	Regulator Topology	Outputs and Type	Outputs and Type
Analog Devices LTC7871HLWE#PBF	100 V	6 V	6	64-LQFP Exposed Pad	98 %	Surface Mount	Positive	SPI	6	64-LQFP-EP (10x10)	Enable Power Good Soft Start	Buck-Boost	750 kHz	60 kHz	Step-Up/Step-Down	150 °C	-40 °C	Transistor Driver
Analog Devices LTC7871ELWE#PBF	100 V	6 V	6	64-LQFP Exposed Pad	98 %	Surface Mount	Positive	SPI	6	64-LQFP-EP (10x10)	Enable Power Good Soft Start	Buck-Boost	750 kHz	60 kHz	Step-Up/Step-Down	125 ¯C	-40 °C	Transistor Driver
Analog Devices LTC7871ILWE#PBF	100 V	6 V	6	64-LQFP Exposed Pad	98 %	Surface Mount	Positive	SPI	6	64-LQFP-EP (10x10)	Enable Power Good Soft Start	Buck-Boost	750 kHz	60 kHz	Step-Up/Step-Down	125 ¯C	-40 °C	Transistor Driver
Analog Devices DC2886A																			51 A 180 A	14 V 70 V	10 V 30 V	Fully Populated	LTC7060 LTC7871	Board(s)	Bidirectional DC/DC	Boost Buck	Non-Isolated	1
Analog Devices LTC7871JLWE#WPBF	100 V	6 V	6	64-LQFP Exposed Pad	98 %	Surface Mount	Positive	SPI	6	64-LQFP-EP (10x10)	Enable Power Good Soft Start	Buck-Boost	750 kHz	60 kHz	Step-Up/Step-Down	150 °C	-40 °C	Transistor Driver

Catalog

Six-Phase, Synchronous Bidirectional Buck or Boost Controller

Key Features

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

• Operates with External Gate Drivers and MOSFETs

• VHIGHVoltages Up to 100V; VLOWVoltages Up to 60V

• Synchronous Rectification: Up to 98% Efficiency

• ADI-Proprietary Advanced Current Mode Control

• ±1% Voltage Regulation Accuracy Overtemperature

• Accurate, Programmable Inductor Current Monitoring and Bidirectional Regulation

• SPI Compliant Serial InterfaceOperation Status and Fault ReportProgrammable VHIGH, VLOWMargining

• Operation Status and Fault Report

• Programmable VHIGH, VLOWMargining

• Phase-Lockable Frequency: 60kHz to 750kHz

• Optional Spread Spectrum Modulation

• Multiphase/Multi-ICs Operation Up to 24 Phases

• Selectable CCM/DCM/Burst Mode Operation

• Thermally Enhanced 64-Lead LQFP Package

• AEC-Q100 Qualification in Progress

Description

The LTC7871 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 LTC7871 allows both batteries to supply energy to the load simultaneously by driving energy from either 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 an SPI-compliant serial interface, discontinuous or continuous mode of operation, OV/UV monitors, independent loop compensation for buck and boost operation, accurate inductor current monitoring and overcurrent protection.The LTC7871 is available in a 64 pin 10mm × 10mm LWE package.APPLICATIONSAutomotive 48V/12V Dual Battery SystemsBackup Power Systems