LTM4686
Recommended for New Designs
The LTM4686 is a dual 10A (12A Peak) or single 20A (24A Peak) step-down µModule® (micromodule) DC/DC regulator with 39ms turn-on time. It features remote...
Datasheet
LTM4686 on Analog.com
I want to replace an obsolete Intersil part with the LTM4686 (single output configuration) and I would like to design the replacement to use either LTM4686 or LTM4686-1 with 12V VIN.
It seems from the datasheet I can just add a separate 5V LDO to supply INTVCC with either part, and have 0ohm's to connect SVIN to VIN for the 4686 and SVIN to INTVCC for the 4868-1. Is this correct?
Hi,
This is correct. Add a decoupling capacitor to the SVin pin if not connected to Vin in accordance to the datasheet. You can also simulate the design through LTSpice to make sure that the design works as intended.
Regards,
Jhun
Thank you.
Is there any risk of damage if VIN and INTVCC don't come up at the same time?
It would be more efficient if INTVCC came from backplane 5V (with VIN coming from backplane 12V). But if for some reason 5V (INTVCC) or 12V (VIN) does not start up immediately I wouldn't want to damage parts on this expensive board.
This should not be a problem. The internal MOSFETs will not be switching if both are not present.
Regards,
Jhun