BQ25890: Request for BQ25890 schematic and layout review

Christina Lim

Expert 6305 points

Part Number: BQ25890

Hi,

My customer is requesting for a schematic and layout review on their BQ25890 design.

Appreciate if BU can help take alook and provide us the feedback. elias-20230324.PcbDoc elias_schematics_DVT.PDF

Thanks,

Christina

over 2 years ago

0 Garrett Kreger over 2 years ago

TI__Mastermind 31100 points

Hi Christina,

We have begun review. Please expect feedback by the end of this week.

Best Regards,

Garrett

0 Christina Lim over 2 years ago

TI__Expert 6305 points

Hi Garett,

Thanks dfor

0 Christina Lim over 2 years ago in reply to Christina Lim

TI__Expert 6305 points

Hi Garett,

Thanks for the feedback.

May I ask also the correct connection of R45, is it should be connected to GND or VCC, or any one can be connected.

Thanks!

Christina

0 Garrett Kreger over 2 years ago in reply to Christina Lim

TI__Mastermind 31100 points

Hi Christina,

Please see my feedback from review below.

- DSEL pin is to be connected to a pull up rail via a 10 Kohm resistor. R45 connection is correct. If customer does not need function of DSEL pin can be left floating.

-TI does not recommend leaving OTG pin floating. If OTG boost mode is not used please short it to ground.

-Battery should be connected to BAT pin not the SYS output pin. Schematic and layout show battery (J4 connector) correctly connected to BAT, but also a net labeled "VBAT" connected at the SYS pin output. Please help to verify if customer is connecting battery to SYS. This will need to be modified if they are.

All other connection to BQ25890 look good.

Best Regards,

Garrett

0 Christina Lim over 2 years ago in reply to Garrett Kreger

TI__Expert 6305 points

Hi Garrett,

Thanks for the feedback.

Unfortunately, the customer had already layout their board and the OTG pin is floating.

May I know the potential risk?

Thanks,

Christina

0 Garrett Kreger over 2 years ago in reply to Christina Lim

TI__Mastermind 31100 points

Hi Christina,

The risk is with OTG pin floating its state (high verse low) cannot be guaranteed. If they never plan to use OTG boost function it should not be an issue because OTG_CONFIG (REG03 bit 5) will be set to 0b by default to disable OTG mode.

Best Regards,

Garrett

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BQ25890: Request for BQ25890 schematic and layout review