MPM3810 cannot regulate under no load

DC-DC Power Converters
1

Dear MPS,

Part: MPM3810GQB-Z

Condition: Load = Open
Cout = 10uF x2 X5R 16V+100nF X7R
Cin = 10uF x1 X5R 16v

When no load the output is ~= vin which is very wrong!!!
when load increase from 1mA to 5mA vout start drop to targeting 3.3V

Both feedback resistor configurations are tested:

  1. 80k, 17k7 as datasheet suggested.
  2. 180K, 40k2 MPS web designer.

So this is very puzzling why the output did not regulated until 5mA.

I hate to say but MPS COT is really really bad over different designs either module or driver IC.

Thanks,
Brian