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-circuiting between cells makes it possible for serial connection of one to four cells.

Features

(1) Internal high-precision voltage detector circuit

• Overcharge detection voltage range: 3.700 V to 4.550 V: Accuracy of ± 25 mV

(at +25°C) (at a 5 mV/step) Accuracy of ± 50 mV (at −40°C to +85°C)

• Hysteresis: 5 types

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: 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: 5 types

CMOS output active “H”

CMOS output active “L”

Pch open drain output active “L”

Nch open drain output active “H”

Nch open drain output active “L”

(CMOS / Nch open drain output for 0.045 V hysteresis models)

(7) Lead-free, Sn 100, halogen-free*1

Applications

• Lithium ion rechargeable battery packs (secondary protection)