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Designing the DS2726 to protect Li+ batteries during a reverse charger event

Posted: 09 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DS2726? reverse charger? Li+ protector? negative voltage?

This application note presents simple design modifications that will allow the DS2726 Li+ protector to withstand negative voltages and protect the battery during a reverse charger event.

A reverse charger connection can defeat the DS2726 Li+ protector circuit. Certain device pins are sensitive to negative voltages and will cause the IC to behave erratically. The DS2726's high-side p-channel FETs will turn off, but some pins on the DS2726 cannot withstand the resulting negative voltages.

This article will discuss both adding Schottky diodes to clamp the voltage on these pins, and increasing the resistance on these pins to limit the current/power dissipation. These simple design modifications will allow the DS2726 to survive a reverse charger event.

View the PDF document for more information.





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