The switching regulator can provide up to 200mA of 1.8V, and I have tested that. But as soon as I solder the MAX30102 back on it, the 1.8V drops to 0.8V and current increases from 5mA (of the whole PCB) to 95mA. So that's a 90mA increase caused by the MAX30102. The only thing using 1.8V rail is this IC.
I have attached the schematic of my PCB, as well as the typical application circuit in the ICs datasheet. and I cannot figure out why this is happening.