I can see that the LT8361 has an example for 12V to -48V@290mA (page 25).
The LT8362 looks similar except for lower SW voltage but has a better package.
How do I determine if the LT8362 is suitable for my application?
If you need -48V from a 12V source the LT8362 is not your part. If your output voltage is lower, it might work.
For this type of inverter the switch sees the sum of the input and the output, so 12V plus 48V would be 60V, and you don’t want to operate a part at its limit.
Also, if you need more current than 290mA, it will help to know that
Thank you for the reply.
I need 12V to -33V@200mA.
Then. the LT8362 would work just fine for you, in place of the LT8361.
Thank you. Are there any difference between the LT8361 and LT8362 except for the power switch voltage?
I cannot find any design support software for the LT8361/LT8362 that helps select component values. Is there an internal tool that you can provide? The datasheet has no information about the VC compensation network. The following is based on page 24 of the LT8361 datasheet.You can basically get any configuration to work in LT spice. I followed the equation in the DS and the inductor size is large 12.3 x 12.3.
I believe the LT8362 is modeled in LTPowerCad, which you can download from our website. However, the application you need appears in both LT8362 and LT8361 datasheets. The -24V CUK can be used for -33V app. You can use the one in LT8361, switching at 400KHz, or the one in LT8362, switching at 2MHz. Both have all the values you need. If the physical size of the inductor is too large for you, you can use a smaller one (same value). You might see a small additional power loss, but it will work. Just make sure the inductor you choose can handle at least 2A of current without saturating.