Part Number: BQ25504EVM-674
I have a Tekpower TP3005N Regulated DC Variable Power Supply which is capable of 0 to 30 V at 0 to 5 A. So I'm connecting this power power supply to the input of BQ25504EVM-674 (as if it was a solar panel) and trying to see if the values stated in the datasheet work ("Can be started with VIN as low as 330 mV, and once started, can continue to harvest energy down to VIN = 80 mV") This is where I'm having issues.
After leaving the board (connected to the LiPo battery and load, which is two other TI regulators and the Cypress PSoC 6) overnight without a V in, I was getting around 1.5 V at both VSTOR and VBAT. So I connected the power supply to the input at 0.330 V and powered it in and the output values stayed the same. I then started slowly increasing the output of my power supply and it wasn't until I got the voltage high enough for the output current reading of the power supply to read 0.10 A that VBAT got to the expected value and began charging.
My understanding is that I shouldn't be needing to get my external power supply that high since this IC is supposed to work at microwatts of power. Any ideas as to why this is happening would be greatly appreciated.