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

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

* 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