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TPS61240: Output drop significantly with tiny loading

Part Number: TPS61240

Hi all, thanks for coming to make my life easier.

I am using the chip to power a set of OpAmp which should need around 50-60mA. For debugging purpose I am using a power supply to power up the TPS61240. So here is the hypothetical setting of the debugging circuit

Chips: TPS61240

Input cap: 2.2uF

Inductor: 1uH

Output cap: 4.7uF

Input voltage: 3.6V

Output voltage: 5V

Things were somehow ok when no loading is applied. Which the power supply suggest the current supplying is less than 1mA. However when the loading was applied, the output voltage dropped significantly. A chip is connected as a test to verify the drop. Which the output voltage drop from 5V to 3.7V, while 13mA was being drawn from the supply. Meanwhile the chip is making the buzzing sounds to tease me and mess with me.

Assumed that maybe the cap values isn't correct since I am getting them somewhere in china, I do tried to change the setting of the circuit and the output characteristic do change a bit. But I am still clueless since I do follow the data sheet for the prototyping. So any good dude here got any idea?

Thanks again for coming.