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TPS62122: TIDA-00690 - Efficiency with TPS62122

Part Number: TPS62122
Other Parts Discussed in Thread: TIDA-00690,

Hi,

I'm working on a demo board similar to TIDA-00690. I have the same harvester and a TPS62122 has DCDC regulator.

With Vout=1.2V, Rload=120Ohms, 110µJ is available.

When I remove the DCDC and put a load at the output of the harvester, this one generates about 280µJ.

Then the efficiency of DCDC regulator is < 50%.

Is there a reason why the efficiency is lower as expected ?

Best regards