UCC3958-1

• Protects Sensitive Lithium-Ion Cells Form Over Charging and Over Discharging
• Dedicated for One Cell Applications
• Does Not Require External FETs or Sense Resistors
• Internal Precision Trimmed Charge and Discharge Voltage Limits
• Extremely Low Power Drain
• Low FET Switch Voltage Drop of 150mV Typical for 3A Currents
• Short Circuit Current Protection (with User Programmable Delay)
• 3A Current Capacity
• Thermal Shutdown
• User Controlled Enable Pin

Supply Voltage (PACK+ to BNEG). . . . . . . . . . . . . . . . . . . 7.5V
Maximum Continuous Charge Current . . . . . . . . . . . . . . . . 3A
Maximum Charger Voltage (PACK+ to PACK) . . . . . . . .. . . 9V
Maximum Reverse Voltage (PACK+ to PACK) . . . . . . . . . 8V
Storage Temperature . . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . .. . 55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . +300°C

UCC3958 is a monolithic BCMOS lithium-ion battery protection circuit that is designed to enhance the useful operating life of one cell rechargeable battery packs. Cell protection features consist of 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 UCC3958 requires a minimum number of external components and is able to operate and safely shutdown in the presence of a short circuit load.