High power density 2A battery charger targets handheld devices

Advanced Analogic Technologies Incorporated (AnalogicTech), a developer of power management semiconductors for mobile consumer electronic devices, announces the AAT3697, a high power density linear battery charger for Lithium-ion/polymer batteries. Coming in a 12-pin, 3mm x 3mm TDFN package, it offers up to 2A of charge current while occupying only 9 mm2 of PCB area.

“Power density is an increasingly important consideration in a wide variety of high performance handheld systems, like smart phones, GPS systems and portable media players that use high capacity batteries,” notes 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 thermal 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 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, 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.

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 3×3-mm package and is rated over the -40°C to +85°C temperature range. It sells for $1.16 each in 1,000 piece quantities.

For more information, please visit the AnalogicTech website:

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