Both, lt3580 and lt8335 will work for you, but neither will give you a 500mA guaranteed max load.
The lt3580 offers some flexibility with its programmable frequency, if you decide you want to reduce the switching frequency. Also, it might run…
My customers are considering LT8335.
In the data sheet, ΘJA is specified, but ΘJC is not listed.
How much ΘJC's are there?
It is the final stage of the design, so I'd like to get an answer as soon as possible.
No, LT8335 won't work due to its SW pin voltage rating.
Are the positive current and the negative current equal all the time? If yes, you can use LT8361.
If not, I'd suggest you to use two LT8361's, one for positive and one for negative.
下面简单介绍下前两周我们在ADI找到的两款芯片：LT8361 和 LT8330-1A（LT8335-2A）。如有其它更好的方案，望推荐。