Ultra low power source for LTC3108

Hello,

I am evaluating the LTC3108 with a prototype TEG that provides 20-50mV but has a very low power rating (around 1uW).

Initial experiments indicated that at least 300uW of power are required by the LTC3108 in order to start-up and provide voltage (3.3V) on its output.

Is there a possible way for the LTC3108 to handle such a low power input?

Are there any alternative parts that could operate at such low power ratings?

Thank you very much,

Fotis