lithium battery pack Protection Features

The DS2720 IC, located in the middle of Figure 1, provides all the safety features required for a single Li- Ion or lithium battery pack Polymer cell circuit through the use of external N-FETs. The cell is protected from over charging, excessive depletion, high discharge currents, and high temperatures. The DS2720 has a trickle charge feature allowing a severely depleted cell to be recovered by using the standard system charger. The host software is able to determine what condition caused the fault and report it.

Note that the protection FETs are mounted on the high side of the circuit between the host/charge source and the positive terminal of the battery as shown in Figure 1. It is preferable to power the DS2770 and DS2415 directly from the battery. This insures that their data will be maintained during a protection fault or when the pack is in sleep mode when the FETs are disabled and data would otherwise be lost. It is possible to do this without violating protection rules because high-side FETs block any possible secondary charge path through the communication lines that would be a concern with low-side FETs.

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