In iWave SOM, PMIC chip from Dialog Semiconductor is used for RTC.
VRTC_3V0 pin on G35M ZU19EG SOM, power rail is connected to the PMIC. As mentioned in SOM Hardware User guide the VRTC_3V0 power rail supports from 0V(Min) to 3.15V(Max). And the current drawn is 1.1uA.
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Please find the detailed product information here:
Zynq™ UltraScale+™ ZU19/ZU17/ZU11 MPSoC System on Module