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The LM25085 is one possible controller solution for your power requirement. Note that the LM25085 is a COT-based controller, requiring the appropriate voltage ripple amplitude at the FB pin (and hence the recommended ESR of the output capacitor).
An alternative is a converter solution based on the LM73605 (3.5V to 36V, 5A synchronous buck converter), which will provide higher efficiency than the LM25085 non-synchronous solution.
