Charger IC delivers 2A, tiny size for feature- rich mobiles

摘要

The AAT3620, the industry's first fully integrated single-cell lithium-ion battery charger, can supply up to 2-A charge-current in a 3 × 3-mm TDFN package. The dual-mode IC provides a switching charger during constant-current (CC) and constant-voltage (CV) modes. To minimize EMI and RFI emission, the device switches to linear mode during CV mode where power dissipation is at a minimum.rnThe switching- and linear-mode charger operates across a 4.3 to 6.0-V input range and performs battery charging using a 1.5-MHz PWM converter. When the current dips below 300 mA in CV mode, the device automatically switches to a low-noise linear mode, minimizing noise as well as EMI and RFI emission.