Features and Benefits

  • 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

Product Details

The LT®8708-1 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.


  • High Voltage Buck-Boost Converters
  • Bidirectional Charging Systems
  • Automotive 48V Systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations


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.


Models for the following parts are available in LTspice:



LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.


Design tools for the following parts are available in LTpowerCAD:


Design Resources

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.


LT8708-1 Discussions

RE: Calculate Coefficients of Chebyshev and Notch-Filters
21 hour(s) ago in SigmaDSP Processors and SigmaStudio Development Tool
RE: Suggestions for +8V logic to drive HMC574AMS8E?
1 day(s) ago in RF and Microwave
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.