For the DC-DC converters, especially with an internal MOSFET, datasheets only specify the Supply current (I_VIN) at No-Load (Quiescent current), they also specify the shutdown current (device is disabled), but no one specifies the supply current at Load > 0A in the datasheet.
In the Load case, the “Supply current with Load” is approximately equal to “I_VIN_quiescent + I_Load” (approximately).