Power Management ICs

Battery Protection IC with Charge-Discharge Control Function for 1-Cell Pack S-82K1A Series

The S-82K1A Series is a protection IC for lithium-ion / lithium polymer rechargeable batteries, which includes high-accuracy voltage detection circuits and delay circuits. It is suitable for protecting 1-cell lithium-ion / lithium polymer rechargeable battery packs from overcharge, overdischarge, and overcurrent.
By using an external overcurrent detection resistor, the S-82K1A Series realizes high-accuracy overcurrent protection with less effect from temperature change.
The S-82K1A Series also has an input pin for charge-discharge control signal, allowing for charge-discharge control with an external signal.

Features

High-accuracy voltage detection circuit
Overcharge detection voltage : 3.500 V to 4.600 V (5 mV step) Accuracy ±15 mV
Overcharge release voltage : 3.100 V to 4.600 V*1 Accuracy ±50 mV
Overdischarge detection voltage : 2.000 V to 3.000 V (10 mV step) Accuracy ±50 mV
Overdischarge release voltage : 2.000 V to 3.400 V*2 Accuracy ±75 mV
Discharge overcurrent detection voltage 1 : 0.003 V to 0.100 V (0.5 mV step) Accuracy ±1.0 mV
Discharge overcurrent detection voltage 2 : 0.010 V to 0.100 V (1 mV step) Accuracy ±3 mV
Load short-circuiting detection voltage : 0.020 V to 0.100 V (1 mV step) Accuracy ±5 mV
Charge overcurrent detection voltage : −0.100 V to −0.003 V (0.5 mV step) Accuracy ±1.0 mV
Detection delay times are generated only by an internal circuit (external capacitors are unnecessary).
Charge-discharge control function
CTL pin control logic : Active “H”, active “L”
CTL pin internal resistance connection : Pull-up, pull-down
CTL pin internal resistance value : 1 MΩ to 10 MΩ (1 MΩ step)
Discharge overcurrent control function
Release condition of discharge overcurrent status : Load disconnection
Release voltage of discharge overcurrent status : VRIOV = VDD × 0.8 (typ.)
Discharge overcurrent status reset function by CTL pin
Available, unavailable
0 V battery charge
Enabled, inhibited
Power-down function
Available, unavailable
High-withstand voltage
VM pin and CO pin : Absolute maximum rating 28 V
Wide operation temperature range
Ta = −40°C to +85°C
Low current consumption
During operation : 2.0 μA typ., 4.0 μA max. (Ta = +25°C)
During power-down : 50 nA max. (Ta=+25°C)
During overdischarge : 0.5 μA max. (Ta = +25°C)
Lead-free (Sn 100%), halogen-free

*1. Overcharge release voltage = Overcharge detection voltage − Overcharge hysteresis voltage
(Overcharge hysteresis voltage can be selected as 0 V or from a range of 0.1 V to 0.4 V in 50 mV step.)

*2. Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis voltage
(Overdischarge hysteresis voltage can be selected as 0 V or from a range of 0.1 V to 0.7 V in 100 mV step.)

Applications

  • Lithium-ion rechargeable battery pack
  • Lithium polymer rechargeable battery pack