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1.2MHz battery chargers minimize solution cost, size

Posted: 23 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:battery-charger ICs? adapter? resistor?

Maxim Integrated Products has introduced the MAX17005/MAX17006/MAX17015 high-frequency, multichemistry battery-charger ICs. These devices employ a proprietary, high-frequency, current-mode architecture that significantly reduces the cost and size of external components. Designed to operate at a high, 1.2MHz switching frequency, these ICs enable the use of a smaller output filter than required by many other battery-charger ICs, thus reducing the size of the design and the BOM associated with the output filter.

Additionally, this family of battery-charger ICs allows the use of n-channel power-selection switches instead of the more expensive p-channel power switches used by conventional solutions. Saving both space and cost, the MAX17005/MAX17006/MAX17015 are well suited for notebooks, tablet PCs and other portable devices with rechargeable batteries.

The MAX17005 charges three to four cells with a cell voltage of 4.2V to 4.4V; the MAX17006 charges two to three cells with a cell voltage of 4.2V to 4.4V; and the MAX17015 adjusts the charge-voltage setting and number of cells through a feedback resistor-divider at the output. In addition, these devices provide a high-accuracy analog output that is proportional to the adapter current. In the MAX17015, current monitoring remains active to monitor the battery's discharge current when the adapter is absent. All devices provide at least 4A of charge current with a 20m sense resistor and overvoltage protection.

The MAX17005/MAX17006/MAX17015 are available in a small, 4mm x 4mm x 0.8mm, Pb-free, 20-pin TQFN package and are fully specified over the -40C to 85C extended-industrial temperature range. Prices start at $5.66 (1,000-up).

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