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Need a negative voltage boost converter

Other Parts Discussed in Thread: BQ25504

Hello TI community,

I was looking for a negative DC-DC voltage boost converter to charge a battery with a negative voltage. I want to make the positive terminals of the battery and power source "common".

The battery voltage plateau is about 2.5 V (need charging voltage up to 3V).
The power source is a solar cell that will have an input voltage of ~ 0.8 V (and can generate ~ 20 mA of current).
The positive terminal of the power source (in this case, solar cell) is directly connected to the positive terminal of the battery.

Is there any negative DC-DC voltage boost converter out there? I am looking for low power (something like bq25504 EVM) but with negative voltage boosting, input voltage range Vin = 500 mV to 3 V. 

Thank you.

Best Regards