I think that it is better to have the Sync-FET mode.
What is the disadvantage of Sync-FET Mode?
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Yes, with certain applications it is beneficial to use the Sync-FET mode of the LMG3425. However, due to the precise dead-time optimization that is required for successful operation, we recommend that you begin your design with LMG3422 and later optimize timing with LMG3425. Please refer to this application report which discusses the timing optimization for our LMG3425/LMG3525 devices.