I purchased a development board of the ltm4653 and used it during testing (DC2327A)
It was modified to output 12V at 15V with a switching frequency of roughly 1 MHz as per the datasheet.
Our operating input voltage range is 14V to 30V.
The output of the LTM 4653 is connected to a pulsed load with additional capacitance at the LTM4553's output to keep the bus stable.
Each time the pulse load activates the LTM4653 responds by supplying it'\s full 4A and the bus falls to 8V and then recovers.
After running the device for a somewhat extended period of operation the device now refuses to turn on at an input voltage lower than 25V.
This was a sudden failure or well seems to be a precursor to failure as the device is still operational but it's as if its UVLO circuitry or something has given in.
The device did not get warm or display any other issues other than the output voltage dip.
The pulsed load condition occurs 10 times a second.
My question is whether this is expected? I will look into paralleling 2 modules in testing, however I'm concerned of experiencing the same failure condition..
Any help will be appreciated