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BQ24167RGE Charger

Peter Narbus
Prodigy 110 points

 Can someone please explain the operation of the external PFET controlled by BGATE?

The datasheet says the gate is low when in high impedance mode and when no input is connected.

Should I use a pullup or pull down on the gate?

Thank you,

Peter

  • 0
    TI__Guru*** 143880 points

    When the system is being powered solely from the battery (i.e., no input power to the IC or the IC is in HiZ mode), this PFET, in parallel with the IC's internal battery FET, provide a lower resistance discharge path from the battery to the system than the internal battery FET would provide alone.  There is no need for a pullup resistor because the PFET's body diode connect the battery to SYS, thereby providing a drive voltage at the source.  A pull down resistor is also not required.