APL3200

APL3200 Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation Features Charge from USB or AC Adapter Accurate BATT Regulation Voltage Programmable DC Charging Current Selectable USB Charging Current (Either 100mA or 500mA) Thermal Regulation for Simplified Board Design Input Protection Up to 18V Soft-Start External Thermistor Monitoring Charge Shutdown Control Charge Status Outputs DC and USB Power-OK Indicators Small, High Power QFN5x5-16 and TQFN4x4-16 Packages Lead Free and Green Devices Available (RoHS Compliant) General Description The APL3200 charges a single-cell Li+ battery from both USB and AC adapter sources. It also includes batteryto-input power switchover, therefore, the system can be powered directly from the power source rather than from the battery. In its simplest application, the APL3200 doesn’ t need external MOSFET or diodes and accepts input voltages up to 6.5V; however, DC input over-voltage protection up to 18V can be added with a single SOT PFET. On-chip thermal limiting simplifies PC board layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage. When the APL3200 thermal limit is reached, the charger does not shut down but simply reduces charging current. Ambient or battery temperature can be monitored with an external thermistor. When the temperature is out of range, charging pauses. Other features include STAT 1 and STAT 2 outputs indicatin...