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LM3478: LM3478-Q1 VS LM3488-Q1 difference

Part Number: LM3478
Other Parts Discussed in Thread: LM3488

Hi, Team:

Can you help to advise LM3478-Q1 and LM3488-Q1 difference?

Besides, can you help to check if them can be used for below application?

Vin=4.5V, Vout=25.5V, Iout>300mA.

From datasheet, they can achieve 100% duty cycle but datasheet has a comments as below. How to make sure they can meet the requirement?

The limits for the maximum duty cycle can not be specified since the part does not permit less than 100% maximum duty cycle operation.