Lithium Battery Protection Circuit for Three or Four Cell Smart Battery Packs

   The MC33346 is a monolithic lithium battery protection circuit that is designed to enhance the useful operating life of three or four cell rechargeable battery packs. Cell protection features consist of independently programmable charge and discharge limits for both voltage and current with a delayed current shutdown, cell voltage balancing with on–chip balancing resistors, and virtually zero current sleepmode state when the cells are discharged.

• Independently Programmable Charge and
   Discharge Limits for Both Voltage and
   Current
• Delayed Current Shutdown
• Cell Voltage Balancing with On–Chip
   Resistors
• Six Wire Microcontroller Interface Bus
• Data Output for Reference, Voltage, Current,
   and Temperature
• Microcontroller Time Reference Output for
   Gas Gauging
• Virtually Zero Current Sleepmode State when
   Cells are Discharged
• Programmable for Three or Four Cell
   Applications
• Minimum External Components for Inclusion
   within the Battery Pack
• Available in Low Profile Surface Mount
   Packages