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BQ25010RHLR schematic review please

Hi, my name is David. It's my first time using the BQ25010RHLR.

I use the Nordic's nRF52832-QFAA MCU. VOUT is expected to be 3V and this will be fed to the MCU.

The MCU has 13k Ohm internal pull-up resistor. I connected the STAT1 and 2 to the MCU.

The numbers inside the brackets are the size metric (1.0mm x 0.5mm 1005, etc).

I wish the DC-DC converter to activate regardless of the USB power input. I want it to work even if the battery isn't charge via USB.

I only use the USB charge. So I tie the AC pin with a pull-down resistor.

V_USB will range to 4.2~5V. It's the power pin of a Micro-B USB pin.

I will create a Test Point to check PG.

I use a Li-ion 3.7~4.2V battery. V_BAT is connected to the positive side of the Li-ion battery.

So my questions are,

0) Is it fine to connect the battery pin to the EN(DCDC enable) pin?

1) Does my resistor/cap configuration for getting 3V as output is correct?

2) The VOUT will be 3V. Is the STAT1 and 2 pin is also 3V when it is high?

-Best Regards

  • David,

    0) Yes, the EN/ pin can be connected to BAT.
    1) Yes, the resistor configuration for 3V output is correct. The calculations for C19 and C33 are correct.
    2) STAT1 and STAT2 are open-drain outputs. When ON, they pull low. When OFF, they must be pulled high externally.

    Regards,

    Dick
  • Appreciate your answer, Dick Stacey.

    " STAT1 and STAT2 are open-drain outputs. When ON, they pull low. When OFF, they must be pulled high externally."

    So these pins approximate to 0V when they are "ON".

    Since I use the MCU's internal 13k ohm pull-up resistor, these pins will become 3V when "OFF"?

    Just checking before closing this thread.

    -Best Regards

  • David,

    If your MCU has a 13k pull-up resistor to 3V then when STAT1 is off it will be pulled to 3V since it is open drain.  Same for STAT2.

    Regards,

    Dick