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BQ25570: Drawing current directly from a lipo connected to VBAT

Jeremy Herbert
Prodigy 140 points
Part Number: BQ25570
Hi, I’m interested in using the BQ25570 to charge a lipo cell. I have a low power MCU which will work fine off the buck converter. However, I also have a radio with a pulse current of ~500mA or so. Is it possible to run the radio directly connected to the battery while the BQ25570 is operating? Radio transmissions are rare, but they will happen. Thanks.
  • 0
    TI__Guru**** 166566 points

    Jeremy,

    It is okay to run the radio from the battery.  However, please be aware that if the radio load causes the battery, and therefore VSTOR, to droop below VBAT_UV=2.2V, the internal FET between VSTOR and VBAT turns off.  This may cause the charger to go into cold start.  I suggest using the VBAT_OK signal to prevent radio transmissions if the battery gets too low.

    Regards,

    Jeff