Question:
In Figure 1 of the datasheet (Rev. 0, 3/12) of MAX14626, why does the loop require two protectors in series?
Answer:
A single MAX14626 can act as a current loop protection device. Two are shown in the figure to indicate that they can be used to protect several modules in the same current loop, but that does not mean that two MUST be used. Their operation is independent of each other. The first page of the datasheet features the typical operating circuit with only one protector.