AnalogicTech AAT3672 is a highly integrated, single-cell Lithium-ion (Li-on)/polymer battery charger and system management IC.

Using three-switch architecture, the dual path device enables simultaneous battery charging and system load management. It automatically reroutes power from the battery to the system without interruption when load requirements exceed available current.

As a single-chip alternative to complex discrete systems, the AAT3672 simplifies power circuit design, reduces board space requirements and drives down system cost in smart phones, navigation devices, and portable media players.

In a number of situations, such as when a GPS-enabled GPRS phone switches zones, a cellular handset or portable system may require more current than the power adapter can deliver. Typically, designers compensate for this possibility by using a larger, more expensive adapter or requiring intervention and control by the system processor.

To address this problem and avoid a power interruption and system reset, the AAT3672 offers a single, highly integrated system, delivering additional power as required from the battery.

The AAT3672 is a single input dynamic battery charger and control IC, compatible with either an AC power adapter or a USB port power source. Dynamic power control allows the device to charge a single-cell Li-on battery and power a system load simultaneously.

The device regulates battery charge current and voltage for 4.2V Li-on battery cells. Battery charge current can be programmed up to 1.6A.

The device automatically manages distribution of power between the source, the battery and the system simultaneously to support all power needs, charging the battery cell with the maximum amount of current possible.

To help minimize charge time and protect an input source from overload, the AAT3672 features an automatic battery charge current reduction loop that automatically compensates for voltage sags and throttles back the charge current when the input source cannot provide the required load current.

The charger/system management IC also offers a number of protection features including battery over-voltage, over-current and over-temperature protection circuits. It also adds system load current limiting capability.

Qualified across the -40 to +85 ºC temperature range, the AAT3672 is available in a compact 14-pin, 3 x 3-mm TDFN package.

More information: www.analogictech.com