The S-8244 Series is used for secondary protection of lithium-ion batteries with from one to four cells, and incorporates a high precision voltage detector circuit and a delay circuit. Short-circuits between cells accommodate series connection of one to four cells.

■ Features
(1) Internal high-precision voltage detector circuit
   • Overcharge detection voltage range : 3.70 to 4.50 V : Accuracy of ± 25 mV (at +25 °C) (at a 5 mV/step) Accuracy of ± 50 mV (at -40 to +85 °C)
   • Hysteresis : 5 optional models available and selectable: 0.38±0.1 V, 0.25±0.07 V, 0.13±0.04 V, 0.045±0.02 V, None
(2) High withstand voltage device : Absolute maximum rating : 26 V
(3) Wide operating voltage range : 3.6 V to 24 V (refers to the range in which the delay circuit can operate normally after overvoltage is detected)
(4) Delay time during detection : Can be set by an external capacitor.
(5) Low current consumption : At 3.5 V for each cell : 3.0 µA max. (+25 °C)
                                            At 2.3 V for each cell : 2.4 µA max. (+25 °C)
(6) Output logic and form : 4 types
                                       CMOS output active “H”
                                       CMOS output active “L”
                                       Pch open drain output active “L”
                                       Nch open drain output active “H”
                                       (only CMOS output for 0.045 V hysteresis models)
(7) Lead-free products

■ Applications
• Lithium ion rechargeable battery packs (secondary protection)