Actually, any Schottky diode with a voltage rating >=20V, and few mA current rating can be used as D1 for MAX17575/MAXM17575 SYNC circuit.
MAXM17575
Obsolete
The Himalaya series of voltage regulator ICs and power modules enable cooler, smaller, and simpler power supply solutions. The MAXM17575 is an easy-to...
Datasheet
MAXM17575 on Analog.com