TPS549B22: Schematic review

HI Allen Li2,

Overall the schematic looks fine. Some recommendations I would have are the following:

1) Increase input cap voltage rating to 25V if possible. 16V cap on 12-V input will be derated quite a bit.

2) Add 0ohm placeholder for boot resistor in series with boot capacitor C820.

3) Add placeholder for SW node snubber R+C as shown in datasheet p. 44 typical application schematic in case it is needed to reduce SW ringing.

4) Try to follow EVM layout example and layout guidelines on p. 54 of the datasheet.

The purpose of the 0ohm series boot resistor is to give the option to slow down the HS FET turn to reduce SW node ringing. You can refer to this app note for a different device for some discussion on the use of a boot resistor. 0201 should be fine. I would pick 1/10W rated resistor if possible.