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Chip regulates battery charge voltage, current up to 2A

Sunnyvale, Calif.—Power management chip vendor Advanced Analogic Technologies Inc. (AnalogicTech) has developed a high power density linear battery charger for Lithium-ion/polymer batteries that offers up to 2A of charge current.

The AAT3697 is housed in a 12-pin, 3mm x 3mm TDFN package, occupying 9-mm2 of PCB area. Applications include high performance handheld systems, such as smart phones, GPS systems and portable media players that use high capacity batteries.

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 harsh high temperature operating conditions.

The AAT3697 continuously monitors battery temperature and charge state for fault conditions. If an over-voltage or over-temperature condition occurs, the device automatically shuts down to protect the charging device, control system and battery under charge. A battery charge timer also protects the battery and system by terminating charge, if the user-programmable charge time is exceeded.

The AAT3697 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.

Pricing: $1.16 each in 1,000 piece quantities.
Availability: Now.
Datasheet: click here.

Advanced Analogic Technologies Inc. (AnalogicTech), 1 408 737 4600, www.analogictech.com.

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