BQ25606: Input state if boost is disabled

Massimo Romano

Part Number: BQ25606
Other Parts Discussed in Thread: BQ25616,

Hello

I would like to know what happen to RBFET when boost mode is disabled (no OTG).
I would like to use the bq25606 (or bq25616) with a 4.2V(charging voltage) battery.

It is powered from a buck converter (from 24V to 4.5V), so when power supply is disconnected the input of the BQ25606 is still conntected to the buck circuit.
I would like to know what happens to RBFET if i disable the boost operation. Is the BQ25606's input disconnected and RBFET is blocking? If yes, how much is RBFET leaking from output to input in that state?

Thanks

Massimo

over 4 years ago

0 Ning T over 4 years ago

TI__Guru 57551 points

Massimo,

RBFET should be on. It is highly recommended to get familiar with the device operations by testing the device EVM.

Thanks,

Ning.

0 Massimo Romano over 4 years ago in reply to Ning T

Prodigy 150 points

I will test it, but i must know if battery is connected to VBUS when Boost are disabled and there isn't a external power supply attached to VBUS.

Thanks

0 Ning T over 4 years ago in reply to Massimo Romano

TI__Guru 57551 points

Hi,

If battery only and OTG mode is not enabled, VBUS should be 0V.

Thanks,

Ning.

0 Massimo Romano over 4 years ago in reply to Ning T

Prodigy 150 points

Thank you.

This should be written on datasheet, cause i think it is important. I thought RBFET block the reverse current if OTG is not enabled, but i wanted to be sure before trying it.

M

Power management

Power management forum

BQ25606: Input state if boost is disabled