Other Parts Discussed in Thread: TPS22860
Dear all,
I'm using BQ25570 to boost up the harvested power. VSTOR is connected to VBAT to charge a 15mF supercapacitor. Without the supercapacitor, I monitored that the VSTOR was boosted up to its programmed level (3.6V in my case) very quickly with a very small amount of input power (15nW?). However with a supercapacitor, it took me an hour for VSOTR to boost up to the same voltage level. The input power was the same.
In my circuit, the BQ25570 will be used to charge a supercapacitor for later use and manage a switch to supply power to the load. When VSTOR = 3.3V, VBAT_OK = 1 and the switch closes, VSTOR is supplied to the load. I need a supercapacitor to store the harvested power for later use. So, could you please recommend me another configuration of BQ25570 that still can store the harvested power up to a sufficient power but with faster time? Is if better if I do not connect VSTOR to VBAT, and use VBAT to charge the supercapacitor instead? Thank you very much.
