Other Parts Discussed in Thread: TLV62080
Hi,
we are currently using TPS62420 in one of our designs as a supply for the F28388D and some other peripherals. More precisely, we are generating 3V3 with converter #1 and 1V2 with converter #2 from a 5V input voltage. As is the case for every switching regulator, a small amount of overshoot on the switching nodes SW1 and SW2 is unavoidable, even in a sophisticated layout. First performance measurements on our actual PCB have shown a small 130 MHz ringing on the SW1 and SW2 nodes with a maximum overshoot of approx. 6.7V at an input voltage of 5V. The ringing deceases pretty fast (gone after 2 rings).
Now, according to the TPS62420 datasheet, the absolute maximum rating on the SW1 and SW2 nodes is 7V, which I assume would be the case for DC. Since I'm not sure if we can keep the overshoot below 7V under all circumstances, I was wondering if there is an additional transient voltage rating for SW1 and SW2 as is the case for other low-voltage buck converters from TI? For example, in the datasheet of the TLV62080, a transient voltage of 10V for less than 10ns is mentioned. Is there a similar rating for the TPS62420 or do we have to start experimenting with RC-Snubbers in order to further reduce the overshoot? Of course, we would like to avoid the latter.
Thanks in advance.
Best regards,
Sebastian