I'm trying to design a PCB including a TPS5450 step down converter.
For the boost capacitor, the datasheet asks for a "low ESR ceramic capacitor":
7.3.5 Boost Capacitor (BOOT) Connect a 0.01-μF, low-ESR ceramic capacitor between the BOOT pin and PH pin. This capacitor provides the gate-drive voltage for the high-side MOSFET. X7R or X5R grade dielectrics are recommended due to their stable values over temperature
But what does that mean exactly? Below how many ohms should the ESR be? (I suppose at the switching frequency, i.e. 500 kHz)
And then, how do I find a corresponding capacitor, knowing that most datasheets I looked into had no information about ESR?
Or does it just mean that I shouldn't use electrolytic capacitors but that any MLCC is fine?