BQ27Z746: why mosfet are on the high side?

Giorgia Navarra

Part Number: BQ27Z746

Dear team,

Why most of the new TI battery gauges have the FETs on the High side (positive pole of the battery) and not on the low side (negative pole of the battery)?

Is this design choice due to some specific feature of the gauge?

Thanks,

Giorgia

over 1 year ago

0 Adrian over 1 year ago

TI__Mastermind 37761 points

Hey Giorgia,

The gauge is built with integrated high side charge pumps which is why the FETs are also high side.

Regards,

Nick Richards

0 Giorgia Navarra over 1 year ago in reply to Adrian

TI__Intellectual 1351 points

Hi Nick,

Thanks for your reply.

In terms of design, Why do we choose to put the charge pumps+FET on the high side or low side?

Are there specific advantages in using high side charge pumps compared to low side charge pumps?

Regards,

Giorgia

+1 Adrian over 1 year ago in reply to Giorgia Navarra

TI__Mastermind 37761 points

Hey Giorgia,

To answer your question you can refer to this thread -> https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1069676/bq76952-high-side-vs-low-side

Our gauges uses I2C or SMBus.

Regards,

Nick Richards

Power management

Power management forum

BQ27Z746: why mosfet are on the high side?