In summary, the LTC4282 controls a single supply, providing two parallel current-limited paths for the load current. By splitting the current into two matched current-limited paths, the LTC4282 ensures that the two banks of MOSFETs share current even during current limit. For a 100A application, each path can be designed with a 50A current limit, halving the SOA requirements, widening MOSFET selection, and reducing their cost. This is called a matched configuration. The LTC4282’s dual current paths are also used to decouple MOSFET SOA requirements from on-resistance. The LTC4282 allows one path with a MOSFET capable of handling stressful conditions and the other path with MOSFETs having low on resistance, called a staged-start configuration. Typically the stress-handling path is turned on and the R_DS(ON) path is kept off during start-up, current limit, and input voltage steps. The R_DS(ON) path is turned on during normal operation to bypass the stress path, providing a low on-resistance for the load current to reduce voltage drop and power loss. There are two types of staged start configurations, low stress and high stress. The high stress staged start is recommended for application current levels below 50A, while the matched and low stress staged start configurations are recommended for applications above 50A.