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Li-ion battery charger reduces component count, system cost

Posted: 24 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? battery charger? isl9204?

Intersil Corp. expanded its portfolio of fully-integrated single-cell Li-ion battery chargers with the release of the ISL9204. According to the company, this product's 28V input voltage rating eliminates the over-voltage protection circuit normally required in low-input chargers, reducing component count and overall system cost. The charger accepts input voltages up to 28V but is disabled when the input voltage exceeds the OVP (over-voltage protection) threshold minimum of 10V, enhancing system protection. This device is optimized for smaller cell capacities by setting the trickle charge threshold at 2.7V and offering charge current accuracy of 10 percent between 75mA and 150mA.

"The ISL9204 is optimized to address the charging requirements of low-capacity 1-cell Li-ion applications such as Bluetooth headsets and small portable multimedia players," said Andrew Baker, product marketing manager of Intersil's handheld power product group. "The ISL9204 offers reduced system cost with increased safety by using integrated over-voltage protection to prevent excessive power dissipation. The tiny 2-by-3mm DFN package enables it to be used in space-constrained and thermally sensitive applications."

The ISL9204 performs the constant current/constant voltage (CC/CV) charge function required by Li-ion batteries. The charge current and end-of-charge (EOC) current are programmable with external resistors. When the charge current reduces to the programmable EOC current level during the constant voltage (CV) charge phase, an EOC indication is provided by the charge (CHG) pin, which is an open-drain output. In addition, two indication pins, power present (PPR) and CHG, allow simple interface to a microprocessor or LEDs.

The ISL9204 is available in an 8-lead DFN standard or Pb-free package and is priced at $1.15 in 1,000-unit quantities.

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