Power Electronics

IC Designed to Protect Two-Cell Li-Ion Battery Packs

Seiko Instruments’ S-8242 Series is the ideal solution for protecting two-cell Li-ion battery packs due to its extremely small footprint design. The world’s smallest package (1.8 mm x 2.0 mm x 0.85 mm) has the lowest current consumption available (10 µA maximum operational mode and 0.1 µA maximum at power down mode) on the market today. This energy-efficient device is also well suited for lithium-polymer rechargeable battery packs, further demonstrating its flexible design characteristics.

With the lowest number of external components, this battery protection IC sets the industry standard. Typical competitive product offerings require 11 external components in the circuit (five resistors, four capacitors, a transistor, and Nch FETs) whereas the S-8242 requires only three resistors, two capacitors, and Nch FETs for a total of six external components.

This high accuracy IC is available in a 6-pin SNB(B) or a SOT-23-6 surface mount package, and features overcharge detection voltage for each cell from 3.9 V to 4.4 V in 50 mV increments, overdischarge detection voltage from 2.0 V to 3.0 V in 100 mV increments, and has two levels of overcurrent protection.

Additional features include a high withstanding voltage of 28 V, a charger detection function, and a wide operating temperature range of –40°C to 85°C. The S-8242 is priced from $0.60 each (SOT-23-6) and $0.65 each [6-pin SNB(B)] in quantities of 10,000.

For more information, visit www.sii-ic.com.

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