CN3722

CONSONANCE 5A, Multi-Chemistry Battery Charger IC With Photovoltaic Cell MPPT Function CN3722 General Descriptions: The CN 3722(Note 1) is a PWM switc h-mode battery charger controller that ca n be powere d by ph otovoltaic cell w ith maximum p ower point tra cking fu nction. The CN 3722 is specially designed for charging 1 or m ulti-cell lithium ion batteries or LiFePO4 batteries with constant current and constant voltage mode. In constant v oltage mode, th e regulation v oltage is set by the ex ternal res istor d ivider. The constant c harging c urrent is pro grammable with a single current sense resistor. Deeply discharged batteries are automatically trickle charged at 15% of the programmed constant charging current until the cell voltage exceeds 66.7% of the regulation voltage. In constant voltage mode, the charging current decreases gradually, the charge cycle will be terminated when the charging current drops to 9.5% of the full-scale current, and a new charge cycle automatically restarts if the battery voltage falls below 95.8% of the regulation voltage in constant voltage mode. CN3722 will automatically enter sleep mode when input voltage is lower than battery voltage. Other features include undervoltage lockout, battery temperature monitoring and status indication, etc. CN3722 is available in a space-saving 16-pin TSSOP package. Features:    Photovoltaic Cell Ma ximum Power Point Tracking Wide Input Voltage: 7.5V to 28V Complete Ch arger C ontroller for 1 or mult...