Lithium Ion Battery Pulse Charger
The MAX1879 is an upgrade to the popular MAX1679, incorporating more safety features like a built-in 6.25hr timer to prevent infinite trickle-charging. Other safety features include continuous over/undervoltage protection, ± .75% charge voltage tolerance, precharging near-dead cells prior to fast-charging, and over/undertemperature sensing.
The MAX1879 and an external P-channel MOSFET make a complete stand-alone charger for a single-cell Li+ battery. An inexpensive current-limited wall cube sets the charging current, and the external FET is pulsed either on or off, so that unlike a linear regulator, the MAX1879 dissipates virtually no power. The MAX1879 accepts inputs of 5 V to 22 V. Charge current is up to 800 mA.
The MAX1879 comes in a 1.1 mm high 10-pin μ>MAX package and is screened for the extended-industrial temperature range (-40deg>C to +85deg>C). co>B>www.maxim-ic.com/co >/B>/t1>