Protecting against reversed Batteries that are in Parallel

Bill Keith

Other Parts Discussed in Thread: SM74611

I have a low power application and we have 2 Lithium 3.6V batteries in parallel as well as an external 3.3V input. I currently use 3 schottky diodes to protect against reversed batteries but the voltage drop of 150mV is too much during certain conditions. Is there a simpler method i can use that will drop less than 50mV and use no more than 10uA?

Thanks.

over 10 years ago

0 WM5295 over 10 years ago

TI__Guru 54715 points

It sounds like you need an ORing controller to minimize loss across a "diode" rather than a battery management device. You might look at the TPS241x family or SM74611. See http://www.ti.com/lsds/ti/power-management/oring-controller-products.page

0 Bill Keith over 10 years ago in reply to WM5295

Intellectual 300 points

WM5295 said:

It sounds like you need an ORing controller to minimize loss across a "diode" rather than a battery management device. You might look at the TPS241x family or SM74611. See http://www.ti.com/lsds/ti/power-management/oring-controller-products.page

I have looked at several of these parts previously but they all draw way too much current for my application.

0 Tim Reyes over 10 years ago in reply to Bill Keith

TI__Expert 3920 points

Hi Bill,
SM74611 is a floating solution, meaning it has no GND pin, and therefore, no Iq will flow to GND.

Tim

Power management

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Protecting against reversed Batteries that are in Parallel