BQ25890H: Turning off RBFET and use reverse boost output from PMID

Dennis Lee nanodesu

Part Number: BQ25890H
Other Parts Discussed in Thread: BQ25895, , BQ24195

Hi,

I'm wondering if this chip can be used like BQ25895 where the boost output is on PMID only, and boost mode will automatically switch off when VBUS is attached to a charger? It seems like BQ25895 does not allow host to control D+/D- level.

If not, are there any USB switch with charger detection like BQ25890H but with charging functionality stripped?

Thanks.

over 5 years ago

0 Ning T over 5 years ago

TI__Guru 50641 points

Hi,

With external circuitry, BQ25890H may have boost output at PMID only.

Thanks,

Ning.

0 Dennis Lee nanodesu over 5 years ago in reply to Ning T

Prodigy 90 points

Hi,

Thanks for your response. What kind of external circuitry is needed?

0 Ning T over 5 years ago in reply to Dennis Lee nanodesu

TI__Guru 50641 points

Hi,

There's no reference circuitry available.

Thanks,

Ning.

0 Dennis Lee nanodesu over 5 years ago in reply to Ning T

Prodigy 90 points

As in, could you elaborate a little bit on what does that external circuitry do?

0 Joel Hernandez II over 5 years ago in reply to Dennis Lee nanodesu

TI__Mastermind 25800 points

Hey Dennis,

You can use the BQ24195/L EVM reference schematic to implement a feature like this using external circuitry. You will notice the Power FET and Control FET tied to the VBUS pin and the input.
www.ti.com/.../sluua18a.pdf

Regards,
Joel H

Power management

Power management forum

BQ25890H: Turning off RBFET and use reverse boost output from PMID