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The bootstrap capacitor used on our EVM is 0.1 μF, 50 V, X7R, 20%, 0603. However, any size would work as long as 0.1 μF capacitance is maintained after 5V is applied across the capacitor (check DC bias characteristic of MLCC). Typically customers would choose the smaller size (0402 or 0603, >16V) for reduced cost and ease of PCB layout.
The ripple current should be minimal in the bootstrap capacitor and not violate the ceramic capacitor's ripple current spec, which is not a standard spec for a ceramic capacitor.
