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BQ25570: Charging current is low during cold start

user4945084
Prodigy 10 points
Part Number: BQ25570
Other Parts Discussed in Thread: BQ25504
I connect the electricity from the harvester to VIN.
I connected the VBAT pin to the supercapacitor, but during cold start only the current of about 10 ~ 5 mA flows.
When VSTOR> VSTOR_CHG_EN (1.8 V), the current increases.
How to speed up by increasing the current because of the slow cold start?
  • 0
    TI__Guru**** 165766 points

    If you input source is strong enough and > VSTOR_CHGEN, you can bypass cold start with FETs as shown below for the bq25504.  

    You set VBATOK to slightly above the VSTOR_CHGENmax threshold so that the charger bypass cold start and enters main charger faster.