About single output 20A in LTpowerCAD of LTM4646

Hi Knj,

I believe LTpowerCAD can support that. Please open LTpowerCAD and search for LTM4646. Enter your specifications and make sure the max paralleled option is set to 2.

Thank you for your reply.

The data you received seems to have two devices connected in parallel, but is it a collection of two outputs from one device?

Taking LTM4668A as an example, by setting the output to two, the output of one device is combined.

However, if you do the same with LTM4646, you will get an error.

Please let me know if there is a way to combine the outputs of one device with LTM4646.

I would be grateful if you could reply.

Best Regards,
Knj

I think this is because you did not set the max paralleled output to 2. If you look at the two outputs, Vout1 and Vout2, they are tied together. It also says that this design is a 2-phase design with 10A per phase to produce a total output of 20A.

Thank you for your reply.

#Paralleled Phases corresponds to the #n part of the figure, and I thought that two devices were connected.

If I set #Paralleled Phases to 2, should I recognize that I'm combining 2 outputs from 1 device?

I would be grateful if you could reply.

Best Regards,
Knj

This picture you attached is just a guide on how to parallel modules/devices and not outputs. Each LTM4646 has two outputs in one device which can be connected together to make a 2-phase design (see Figure 19 on page 29 of the datasheet).

If two LTM4646 are connected in parallel with all outputs tied together, that would be a 4-phase design (see Figure 20 on page 30 of the datasheet).

Thank you for your reply.

I was able to understand.
Thank you for your kindness.

Best Regards,
Knj