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TPS61220: TPS61220DCK is not boosting up the voltage with lower voltage input

Part Number: TPS61220
Other Parts Discussed in Thread: TPS22910A

Hi All,

I am using TPS61220DCK in my design for a while with 3V input battery to generate 3V stable output even if input voltage goes down till 2.0V. It works perfectly alright. 

Now I would like to use 1.4V Zinc-Air battery as input to the device and would like to generate 3V at output. 

When I supply 1.4V input to TPS61220DCK  it only shows 1.5V at output. I tried connected 2 Zinc-air in series i.e 2.8V at input, still the output is 1.5V. 

I am attaching my circuit for your reference. Can someone help what could be going wrong. 

Regards

Lakshmikanth