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TPS22901: TPS22961EVM

Part Number: TPS22901
Other Parts Discussed in Thread: TPS22961, TPS22916

Tool/software:

Hello 

I would like to implement TPS22961 on my new development device that need Soft start solution with low drop voltage 

I ordered the TPS22961EVM for pretest

My input i 4VDC and and output is a Digital Load with 1A

The VBAIS I sorted to ON pin and connected ti to GPIO = 3.3VDC or VIN

Below is a Vinput = 4VDC

Green, without load of 1A i got output = 3.26V

Green, with load of 1A i got = 2.61VDC

How it possible so big drop voltage ???? what i do wrong ??