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Four cell lithium-ion protection chip uses 0.25 μA

Four cell lithium-ion protection chip uses 0.25 μA

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By Nick Flaherty



The S-8224A/B Series is aimed at protecting Li ion batteries in laptop computers, power tools and other portable devices from overcharge, overdischarge, overcurrent and short circuits.

The use of a secondary protection IC like the S-8224A/B Series is especially critical in cases of overcharge conditions which may result in heating and ignition of the Lithium-Ion batteries. The S-8224A/B provides the design engineer with another robust layer of safety.

The other main features include overcharge detection voltage accuracy of ±20 mV, which provides for further enhanced safety monitoring of lithium-ion batteries  and an SNT-8A package measuring 2.5 x 2.0 x 0.5 mm, which leads to a reduction in the size, thickness and weight of portable devices.

In addition, the output control function paves the way for adding a PTC-based temperature protection function. This allows the S-8224A/B Series to detect not only overcharge, but also abnormal temperatures. Moreover, the device has a gate connection terminal of the charge control FET equipped with an output voltage control circuit, meaning that the series is also compatible with a FET with a gate-source withstand voltage of 12 V.

The datasheet is at datasheet.sii-ic.com/en/battery_protection/S8224A_B_E.pdf

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