I will use TPS65186 for e-ink panel but I have a problem.
I don't understand type of diode.
This diode connected to VB_SW pin and VN_SW pin.
Is this diode schottky or zener?
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A SMPS requires 2 switches but, for an asynchronous power supply one switch can be replaced by a diode. That is the case here where, the PMIC has one FET internal and requires a diode to pass the current, (energy), from the VIN to the SW node or the output, depending on which DCDC you are studying.
DCDC1 is a boost and the diode replaces the HS FET while the DCDC2 is an inverting buck-boost.
Read these application notes that discuss the overviews of boost and inverting buck-boost converters.