The UCC3952A is a monolithic BiCMOS lithiumion battery protection circuit designed to enhance the useful operating life of a one-cell rechargeable battery pack. Cell protection features include internally trimmed charge and discharge voltage limits, discharge current limit with a delayed shutdown, and an ultra-low-current sleep mode state when the cell is discharged. Additional features include an on-chip MOSFET for reduced external component count and a charge pump for reduced power losses while charging or discharging a low-cell-voltage battery pack. This protection circuit requires one external capacitor and can operate and safely shut down in a short circuit condition.