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Capacitors between BQ24075 and TPS63020

Claus Denk
Prodigy 130 points
Other Parts Discussed in Thread: BQ24075, TPS63030, TPS63020

Dear all,

I am currently designing a power supply based on the BQ24075 and a TPS63020. Both will go on the same PCB, the output of the BQ24075 connected to the input of the TPS63020 (which is set to 5V output). In the application diagram of the TPS63020, we have 2 x 10uF and a 0.1uF at the input of the TPS63030, whereas the BQ24075 should go with a 4.7uF - 47uF on the output. If I combine the two ICs, should I maintain all 4 capacitors in between, positioning the 0.1uF very close to the TPS63030 and say a 4.7uF very close to the BQ24075 with the two 10uF in between, or should I reduce capacitors here? I would like to get the both ICs as close as possible.

Thanx for any hints!

  • 0
    TI__Guru*** 148910 points

    Being a switching power supply, the TPS63020's input caps need to be placed as close as possible to its VIN and PGND pins.  Being a linear charger, the bq24075's output caps do not need such stringent placement relative to the output terminals.  But they should be close.

    You can increase the Cin on the TPS63020 without limit, so I recommend using the same capacitor configuration that each IC recommends--4.7uF, 2 x 10uF, 0.1uF total.  This keeps the total capacitance within the limits of the charger while keeping the recommended capacitance for each device.

  • 0 in reply to Chris Glaser
    Prodigy 130 points

    Thanx for the super fast answer!