Charging and protection for a LIR2032 cell: LTC4071

Hi EZ!

I'm new to Li-Ion battery design, so please don't judge if I make stupid mistakes. In our IoT solution we use a LIR2032 Li-Ion cell. Here is some information from it's datasheet:

Nominal Voltage: 3.6V
Nominal Capacity: 35 mAh
Maximum Capacity: 40mAh
Internal resistance: ≤600mΩ

  • When the battery is used on load, it is recommended to design a charge/discharge protection circuit for the battery.
  • In a temperature of 20±5°C, CC charge 0.2CmA / voltage up to 4.20V; Then CV charge. Terminate charging when the charging current value is less than 0.05CmA. Rest for no more than 10 minutes, Discharge CC at 0.2CmA to 2.75V.
  • Temperature 20±5°C, CC charge at 1CmA to 4.20V; turn to CV charge; Terminate charging when the charging current value is less than 0.05CmA, rest for no more than 10 minutes, then at 1CmA CC discharge to 2.75V.
  • When the battery is stored and not used under room temperature for over 6 months, it needs to be recharged by the procedure below: Discharge by CC mode at 0.2CmA to 2.75V, then rest for 5 minutes, Charge by CC mode at 0.2CmA to 4.20V limit, then change to CV charge mode, Cut off the charge when the charging current is less than 0.05CmA.
It's required to implement CC/CV charging with 7mA current for normal mode and 35mA current for fast mode, input voltage is between 4.5V and 5.5V. Currently, a combination of separate Standalone Li-Ion Charger, Battery Protection IC and Dual MOSFET is used for the cell's charging and protection. We would like to miniaturize this charging and protection circuit, ideally using a single IC for both charging and protection instead of a current solution with 3 ICs.
I have selected LTC4071 for this purpose. Please, let me know if there is a more IC for this purpose or give some pointers where should I start to design a charging and protection circuit using this IC.
Parents Reply Children
No Data