LT8708-1
Info : RECOMMENDED FOR NEW DESIGNS
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LT8708-1

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 12
1ku List Price Starting From $7.84
Features
  • 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
Additional Details
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The LT8708-1 is a high performance buck-boost switching regulator controller that is paralleled with the LT8708 to add power and phases to an LT8708 system. The LT8708-1 always operates as a slave to the master LT8708 and has the capability of delivering as much current or power as the master. One or more slaves can be connected to a single master, proportionally increasing power and current capability of the system.

The LT8708-1 has the same conduction modes as LT8708, allowing the LT8708-1 to conduct current and power in the same direction(s) as the master. The master controls the overall current and voltage limits for an LT8708 multiphase system, and the slaves comply with these limits.

LT8708-1s can be easily paralleled with the LT8708 by connecting four signals together. Two additional current limits (forward VIN current and reverse VIN current) are available on each slave that can be set independently.

Applications

  • High Voltage Buck-Boost Converters
  • Bidirectional Charging Systems
  • Automotive 48V Systems 
    Part Models 12
    1ku List Price Starting From $7.84

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    Documentation

    Documentation

    Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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    Product Lifecycle

    PCN

    Apr 6, 2021

    - 21_0046

    Transfer of LQFP and LQFP_EP from AEM to AET

    LT8708ELWE-1#PBF

    PRODUCTION

    LT8708HLWE-1#PBF

    PRODUCTION

    LT8708ILWE-1#PBF

    PRODUCTION

    Apr 5, 2022

    - 21_0046

    Transfer of LQFP and LQFP_EP from AEM to AET

    LT8708ELWE-1#WPBF

    PRODUCTION

    LT8708HLWE-1#WPBF

    PRODUCTION

    LT8708ILWE-1#WPBF

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    Filter by Model

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    Part Models

    Product Lifecycle

    PCN

    Apr 6, 2021

    - 21_0046

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    Transfer of LQFP and LQFP_EP from AEM to AET

    LT8708ELWE-1#PBF

    PRODUCTION

    LT8708HLWE-1#PBF

    PRODUCTION

    LT8708ILWE-1#PBF

    PRODUCTION

    Apr 5, 2022

    - 21_0046

    arrow down

    Transfer of LQFP and LQFP_EP from AEM to AET

    LT8708ELWE-1#WPBF

    PRODUCTION

    LT8708HLWE-1#WPBF

    PRODUCTION

    LT8708ILWE-1#WPBF

    PRODUCTION

    Software & Part Ecosystem

    Software & Part Ecosystem

    Evaluation Kit

    Evaluation Kits 1

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    DC2719A

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

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    DC2719A

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

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

    Product Detail

    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.

    Tools & Simulations

    Tools & Simulations 1

    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.

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