TPS40210: i want to check whether we can use a bigger value cap here.

Hi Frank,

How big do you mean, and why do you want to place a big cap? The 1uF recommended capacitance should support all applications of this device. If you mean something up to 10uF, I don't see any issue, but much higher capacitance is not recommended for cost consideration and also for the internal LDO loop stability concern.

Thanks,
Youhao