Battery Chargers Trim External Components May 22, 2008
The MAX17005, MAX17006, and MAX17015 multi-chemistry battery-chargers employ a proprietary high frequency, current-mode architecture that promises to significantly reduce the cost and size of external components. With a switching frequency of 1.2 MHz, they enable the use of smaller output filters and n-channel power-selection switches instead of more expensive p-channel devices. The MAX17005 charges three to four cells with a cell voltage of 4.2V to 4.4V while the MAX17006 charges two to three cells with a cell voltage of 4.2V to 4.4V. The MAX17015 adjusts the charge-voltage setting and number of cells through a feedback resistor divider at the output. Additionally, the devices provide an accurate analog output that is proportional to the adapter current. They each provide at least 4A of charge current with a 20-milliOhm sense resistor and over-voltage protection. All three devices are available in 20-pin TQFN packages measuring 4 mm x 4 mm x 0.8 mm with prices starting at $5.66 each/1,000. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.
