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TPS61013: Output voltage drops when input > 1.1 V

Part Number: TPS61013
Other Parts Discussed in Thread: CC2544, TPS61220, TPS61070, , TPS61016

Dear Sirs,

I am currently developing a remote control using Ti's CC2544. For powering it, I use a single AAA battery and TPS61013DGS to get 2.5 V. The consumption at 2.5 V should not be higher than 30 mA. 

The problem is that when the input voltage is higher than 1.1 V, the output drops to 1.8 V. Below 1.1 V, the output keeps a constant value of 2.47 V. The circuit is quite simple and I followed the examples provided in the datasheet:  

Any suggestion?