UCC39521

Features:

Protects Sensitive Lithium-Ion Cells From Overcharging and Over-Discharging
Dedicated for One-Cell Applications
Integrated Low-Impedance MOSFET Switch and Sense Resistor
Precision Trimmed Overcharge and Overdischarge Voltage Limits
Extremely Low Power Drain
3-A Current Capacity
Overcurrent and Short-Circuit Protection
Reverse Charger Protection
Thermal Protection


Pinout




Specifications

Supply voltage (PACK+ to BNEG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Maximum forward voltage (PACK+ to PACK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 V
Maximum reverse voltage (where PACK+ to BNEG = 5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V
Maximum cell continuous charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A
Junction temperature, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 150°C
Storage Temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Data Book for thermal limitations and considerations of packages. All voltages are referenced to GND.


Description

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.