LTC7871

RECOMMENDED FOR NEW DESIGNS

Six-Phase, Synchronous Bidirectional Buck or Boost Controller

Data Sheet (Rev. B) Product Selection Table

Part Models: 8
1ku List Price: Starting From $4.24

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Part Details

Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current
Operates with External Gate Drivers and MOSFETs
V_HIGH Voltages Up to 100V; V_LOW Voltages 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 Interface
- Operation Status and Fault Report
- Programmable V_HIGH, V_LOW Margining
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

Part Models: 8
1ku List Price: Starting From $4.24

Documentation

Data Sheet 1

LTC7871: Six-Phase, Synchronous Bidirectional Buck or Boost Controller Data Sheet (Rev.B) 03/20/2020

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC7871ELWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871ELWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871HLWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871HLWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871ILWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871ILWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871JLWE#PBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC7871JLWE#WPBF	64-Lead LQFP (10mm x 10mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 15, 2022 - 22_0183 LTC7871 and LTC7872 data sheets updates
		PCN22_0183_Form Material_Report Datasheet Specification Comparison Datasheet Specification Comparison
LTC7871ELWE#PBF	PRODUCTION
LTC7871ELWE#WPBF
LTC7871HLWE#PBF	PRODUCTION
LTC7871HLWE#WPBF	PRODUCTION
LTC7871ILWE#PBF	PRODUCTION
LTC7871ILWE#WPBF
LTC7871JLWE#PBF	PRODUCTION
LTC7871JLWE#WPBF

This is the most up-to-date revision of the Data Sheet.

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC7871

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC7871/LTC7060 48V-to-14V, 6-Phase, 2.5kW Bidirectional Supply/Charger

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Product Details

Demonstration circuit DC2886A is a high power, high efficiency six-phase bidirectional converter featuring the LTC7871 and LTC7060. The terminals labeled V_HIGH and V_LOW are either inputs or outputs depending on the direction of power flow. When the switch at SW1 is in the BUCK position, V_LOW provides a 14V output and V_HIGH is the input with a range of 30V to 70V. When the switch is in the BOOST position, V_HIGH provides a 48V output and V_LOW is the input with a range of 10V to 14V. The maximum V_LOW current is 180A in both directions. The maximum output power is 2.5kW when operating as a buck within the input voltage range. When operating as a boost, the maximum output power is 2.4kW when the input voltage is 14V. External airflow is required when operating at maximum power. The MOSFETs in each phase are driven by the LTC7060 half bridge driver. Each LTC7060 gate driver is placed next to the MOSFETs and receives a PWM signal from the LTC7871.

The inductor current for each phase is sensed with a low 1mΩ sense resistor using a highly accurate AC/DC current sensing architecture with low power dissipation. The LTC7871’s constant-current loop provides a DC current limit for the current flowing in or out of the V_LOW terminal depending on the state of the BUCK pin. This current can be programmed with the SETCUR pin and monitored with the IMON pin.

The DC2886A provides a SPI compatible serial port. With a DC2026C (Linduino^® One) demo board and QuikEval^™ software on a host computer, the user can:

Margin the regulated V_LOW or V_HIGH up or down.
Margin the DC current limit up or down with the SETCUR pin.
Adjust the frequency spread and modulation rate of the spread spectrum circuit, when spread spectrum is enabled.
Monitor the operational status and faults of the LTC7871.

Additional features of the DC2886A include:

Pin selectable light load operating modes
- Buck: FCM, pulse-skipping and Burst Mode^® Operation
- Boost: FCM and pulse-skipping
SYNC and CLKOUT pins
Optional jumper to enable spread spectrum modulation
RUN, FAULT, PGOOD and PWNEN pins
BUCK pin to externally control the direction of power flow
Footprint for an optional heatsink