The VDS vs ID graph does not include the saturation region of the curve thus the characteristics of the MOSFET is unclear. Please provide the extended graph for VDS vs ID curve if possible.
Also the VGS Threshold is specified to be less than 2.3V while the VGS vs ID Transfer curve depicts it to be around 2.7V. So can you provide correct range of Vgs Threshold?
Datasheet link:www.ti.com/.../csd18533q5a.pdf