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TPS54334: TPS54334 used as fly-buck issue

Part Number: TPS54334
Other Parts Discussed in Thread: TPS5160, TPS54308

Hi Team,

My customer is using our TPS54334 in their new project. They were trying to use TPS54334 with fly-buck topology but met issue and here comes some questions:

1. Are TPS54334 be able to work with fly-buck topology? If not, why?

2. When we checking the low side sinking current, it seems for TPS54335 the low side switch sinking current limit is 0A, Can I know why?

BTW, we also checked TPS5160, the specific is 5.4A, totally different with TPS54335:

So was this the issue that TPS54335 is not suitable for a fly-buck? Pls correct me, if not.

As customer need to PP asap, your kindly support are appreciated! 

Best regards,

Sulyn