LT8708-1

RECOMMENDED FOR NEW DESIGNS

80V Synchronous 4-Switch Buck-Boost DC/DC Slave Controller for LT8708 Multiphase System

Data Sheet (Rev. C) Product Selection Table
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Overview

  • Slave Chip of LT8708 to Deliver Additional Power
  • Good Current Matching to the Average Output Current of LT8708 Through Current Regulation
  • Easily Paralleled with LT8708 Through Four Pins
  • Synchronized Start-Up with LT8708
  • Same Conduction Modes as LT8708
  • Synchronous Rectification: Up to 98% Efficiency
  • Frequency Range: 100kHz to 400kHz
  • Available in 40-Lead (5mm × 8mm) QFN with High Voltage Pin Spacing and 64-Lead (10mm × 10mm) eLQFP
  • AEC-Q100 Qualifed for Automotive Applications
LT8708-1
80V Synchronous 4-Switch Buck-Boost DC/DC Slave Controller for LT8708 Multiphase System
LT8708-1 Application Circuit LT8708-1 Performance Graph LT8708-1 Pin Configuration LT8708-1- Pin Configuration EDN HOT 100
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Documentation

Data Sheet 1

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT8708
  • LT8708-1

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LT8708
LTspice

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

eval board
schematic 1
DC2719A

LT8708/LT8708-1 80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability

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Product Details

Demonstration circuit 2719A is a high performance bidirectional buck-boost converter featuring the LT8708/ LT8708-1 that can operate from input voltages above, below or equal to the output voltage. The demo board input range is 10.5V to 14.5V (25VMAX). The output voltage is set at 14.5V and the output current limit at 40A. The board can operate in both forward and reverse mode.

The controller has integrated input voltage and output voltage regulators and two sets of input and output current regulators that control current flow in forward or reverse direction. Features are included that simplify bidirectional power conversion in battery/capacitor backup systems and other applications that may need regulation of VIN, VOUT, IIN and/or IOUT.

While the current mode control limits the inductor current both in normal and in reverse direction these current limits have some variation as input/output voltage changes. The forward and reverse input and output current regulators offer four accurate current limits that can be set individually.

The input voltage regulator is often used in applications with high impedance power sources and will reduce the forward current if the input voltage drops below the set point. When operating with reverse current flow, the input voltage regulator regulates the voltage at the input side.

The operating mode of the controller is determined through the MODE pin (jumper JP9 Pins 5 to 12) and can be set to discontinuous mode, hybrid discontinuous mode, forced continuous mode and Burst Mode® operation.

The LT8708 is capable of bidirectional operation when operating in the continuous conduction mode (CCM). DCM, HCM and Burst Mode operation only allow power to flow in one direction. Additional circuitry may be needed depending on the application.
DC2719A
LT8708/LT8708-1 80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability
DC2719A_UG-1407 Application Circuit

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