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ISOW1044: Low power efficiency with ISOW1044

Part Number: ISOW1044
Other Parts Discussed in Thread: ISO1044


My customer is contemplating if they should be using ISO1044 vs ISOW1044. They are attracted to use ISOW1044 with a simplified design however they had some concern over the low efficiency. At the same, there is an application notes indicating that there may be a potential EMI concern while using ISOW1044. 

Can you help comment on the above?