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TPS1HC30-Q1: TPS1HC30-Q1 current limit

Part Number: TPS1HC30-Q1

Tool/software:

Hi experts,

according to the datashet figure 8-4. it show different VDS versis LIMI.

I'm confuse that the VDS value is equal to Rdson*IOUT?

If that is correct the result will be 30mohm*4.5A=0.171V.

the VDS only 0.171V, how can I get the relationship between 0.171V and figure shown?  

BR,

Viola