Advanced Analogic Technologies Inc. (AnalogicTech) announced the AAT3620, a fully integrated single-cell Lithium-ion battery charger capable of supplying up to 2 A charge current in a 3 × 3 mm TDFN package. This dual mode produce provides a 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. The AAT3620 is operates across a 4.3 to 6.0 V input range and performs battery charging using a 1.5 MHz PWM converter. During CC and most of CV mode, the device delivers up to 2 A. When the current dips below 300 mA 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% 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 AAT3620 sells for $1.60 in 1K quantities.
Advanced Analogic Technologies