• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 174 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25601: Start-up current from battery

Mark Guastaferro
Genius 11645 points
Part Number: BQ25601

I need to determine what type of outrush current the battery might experience when it is connected to a system using the bq25601. I assume the worst case would be when a battery is inserted but there is no source voltage on VBUS.   The charger will power up and the BATFET will turn on using battery current.

Certainly there will be inrush current to system capacitors on the BAT pin (10 uF), and current to charge caps on the VSYS output, but what happens within the bq25601?

Does current jump to the applicable Iq levels, or are there any current spikes (like charging up FET gates) ?  

Does the BATFET have any type of softstart to control the VSYS inrush current?  

  • 0
    TI__Expert 5590 points

    The inrush current from BAT to SYS is determined by capacitance on SYS. The duration is pretty short, about 10us for 22uF cap, The device does not build in softstart since the inrush current is limited and short. There is no inrush current going in the device.