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Battery IC combines cell balancing, overcurrent protection

Posted: 05 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power management? Li-ion battery packs? integrated chipsets?

Intersil Corp. has released the single-chip ISL9208 and ISL9216/17 chipset, which it has billed as the industry's first integrated analog front ends for cell balancing and overcurrent protection in multicell Li-ion battery packs.

The ISL9208 single chip and ISL9216/17 chipset can replace up to 17 FETs, 12 diodes, 53 resistors and 31 capacitors in some designs and will simplify designs for multicell battery-powered packs for a wide range of applicationsfrom power tools to hybrid automotive vehicles.

Cell balancing allows the microcontroller to keep cell capacities matched to increase the battery pack's operating time. The built-in 3.3V voltage regulator reduces component count while providing power to the microcontroller. The devices provide critical protection through the ability to detect short circuits and overcurrent conditions and automatically shut down the power FETs when necessary.

The ISL9208 is recommended for 5-7 cell (18-28V) battery packs and the ISL9216/17 chipset for 7-12 cell (28-50V) battery packs. The ISL9216 and ISL9217 chipset solution extends the monitoring capability to higher voltage cell packs by establishing a communication link between an I?C interface and a level shifter of the two chips.

The ISL9208 and ISL9216 are available in 32-lead, 5-by-5mm Pb-free quad flat no-lead (QFN) packages starting at $2.33 and $3.08, respectively, in quantities of 100 to 1,000. The ISL9217 is available in a 4-by-4mm Pb-Free 24-lead QFN configuration starting at $3.01 each in quantities of 100 to 1,000.

- Ismini Scouras

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