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Linear battery charger delivers 'extremely high' power density

Posted: 11 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:battery charger? Li-ion/polymer batteries? linear charger?

AAT3697 linear power battery charger from AnalogicTech

Advanced Analogic Technologies Inc. has announced the AAT3697, touted to be an extremely high-power-density linear battery charger for Li-ion/polymer batteries. Available in a 12-pin, 3-by-3mm TDFN package, the latest addition to the company's battery charger product line offers up to 2A of charge current while occupying 9mm? of PCB area.

"Power density is an increasingly important consideration in a wide variety of high performance handheld systems, like smartphones, GPS systems and portable media players that use high capacity batteries," said Bill Weiss, product line director for AnalogicTech. "This new linear charger offers the industry's highest charge-current-to-solution-footprint ratio while the integration of AnalogicTech's intelligent digital thermal loop feature enables the host system to use a high current linear charger without the risk of pulse charging the battery."

Intelligent heat management
The AAT3697 integrates an internal charging device, reverse blocking and current sensing circuits. An intelligent digital thermal loop control system continuously measures internal circuit temperature and automatically reduces the fast-charge current when the device exceeds a preset die temperature threshold. By constantly evaluating the die temperature and adjusting the fast-charge current only to the extent necessary, this closed-loop thermal management system maximizes charge current and minimizes charge time, even under high-temperature operating conditions.

The device continuously monitors battery temperature and charge state for fault conditions. If an overvoltage or over-temperature condition occurs, the device automatically shuts down to protect the charging device, the control system and the battery under charge. A battery charge timer also protects the battery and the system by terminating charge if the user-programmable charge time is exceeded.

Charge status monitor
The new battery charger also features two status monitor output pins capable of driving external LEDs to indicate charge status. A serial interface output can be used to report any of 12 charge states to the system microcontroller.

The AAT3697 is available in a Pb-free, thermally-enhanced, 12-pin TDFN 3-by-3mm package and is rated over the -40C to 85C temperature range. It sells for $1.16 each in 1,000-piece quantities.

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