The UCC3952 monolithic BiCMOS lithiumion battery protection circuit increases 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-cellvoltage battery pack. This protection circuit requires one external capacitor and can operate and safely shut down in a short circuit condition.