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Integrated battery charger supplies 2A charge current

Posted: 27 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion? charger battery? 2A current charge?

AAT3620

Advanced Analogic Technologies Inc. has introduced what it claims is the industry's first fully integrated single-cell Li-ion battery charger capable of supplying up to 2A charge current in a 3mm x 3mm TDFN package.

Dubbed as the AAT3620, the dual mode solution provides a high efficiency switching charger during constant current (CC) and constant voltage (CV) mode. To minimize EMI and RFI emission, the device switches to linear mode during CV mode where power dissipation is at a minimum.

As portable devices integrate increasingly complex features such as GPS, Bluetooth, Wi-Fi, FM, cameras and high-resolution displays, they require higher capacity batteries and longer charge times to support those functions. This unique solution is optimized to serve these portable systems where larger battery capacity and faster charge time is an essential requirement for high performance.

The AAT3620 is a dual mode, PWM switching and linear mode charger designed to maximize charge efficiency. Operating across a 4.3V to 6.0V input range, the device performs battery charging using a 1.5MHz PWM converter. During CC and most of CV mode, the device delivers up to 2A. When the current dips below 300mA in CV mode, the device automatically switches to a low noise linear mode minimizing noise, EMI and RFI emission.

The AAT3620 also features programmable end of charge using external resistor, built-in reverse blocking, a 1 percent constant voltage mode regulation and an integrated programmable charging timer. Over-voltage, over-current and over-temperature protection circuits monitor charge state and battery charge temperature for fault conditions. The charger IC also adds a status monitor output pin to indicate battery charge status and power source status via a display LED.

Qualified over a -40C to +85C temperature range, the AAT3620 is available in a 14-pin, 3mm x 3mm TDFN package.

- Henri Arnold
EE Times Europe





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