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BQ24610: Pass-Through Charging and AC Adapter Specs

Fedor Adarichev
Prodigy 160 points
Part Number: BQ24610

Hello,

I am planning to build a custom UPS (uninterruptible power supply) with this chip.  My questions are:

  1. Does this typical schematic application in Figure 19 allow for pass through charging? What I mean by that is, when I have the AC adapter attached, will I be sourcing current straight from the adapter, and part of that current will go to charging the batteries if they need charging? 
  2. If I have my AC adapter plugged in, and I have a fully or even half-charged battery attached, when I disconnect the AC adapter, will I see a momentary drop in voltage/current? And, will this drop in voltage/current be significant enough to cause my system to restart (if connected to a MCU)?
  3. Likewise, if I disconnect my batteries in that same setup as above, will I also see that momentary drop that might cause my system to restart?
  4. If I use an AC adapter that outputs say 12V/20A, and I set my current limit for charging to 10A on this chip, that means I can still safely charge my batteries at 10A, and then use the other 10A for my system, correct?

  • 0
    TI__Genius 15315 points

    Hi,

    Based on datasheet figure 19 reference circuit. Below is my response for your question.

    1. No, this device is buck topology for charging.

    2. If you plug out AC adapter, the Q3 will turn on to force battery discharge

    3. With Ac adaptor existed condition, system power should be applied by adaptor. So if you disconnect battery, there is no voltage drop happened.

    4. Due to we have power path to separate system power path and charge path. So 10A for system and 10A for charger are ok.

    Thanks