ACT  -  Series DataSheet
ACT3704  -  12V Linear-Mode Battery Charger for Li+/Li-polymer Cells  -  Active Semi  -  DC-DC

FEATURES
• Internal High Voltage MOSFET
• Up to 12V Input Voltage
• ±0.5% Output Voltage Accuracy
• Charge Current Thermal Foldback
• Programmable Termination Voltage
• Programmable Fast Charge Current
• Programmable Charging Timer
• No Blocking Diode Required
• Low Reverse Leakage
• Preconditioning for Deeply Depleted Battery
• Low Quiescent Current Standby Mode
• Space-Saving, Thermally-Enhanced SOP-8/EP, TDFN33-8
APPLICATIONS
• Mobile Phone
• Wireless Headsets
• Portable Media Players
• Cradle Chargers
• Portable Devices
GENERAL DESCRIPTION
The ACT3704 is a complete linear charging solution for single cell Lithium Ion and Lithium Polymer batteries.
It incorporates an internal 12V power MOSFET for Constant-Current, Constant-Voltage control (CC/CV).
The battery regulation voltage accuracy is ± 0.5% and can be set to either 4.1V or 4.2V. The charge current is programmed with an external resistor to a maximum of 1A to minimize total charge time.
The reverse leakage current from the battery is less than 1μA if the input adaptor is disconnected or if there is a reverse battery connection. The ACT3704 is available in thermally-enhanced SOP-8/EP, and TDFN33-8 packages to accommodate high charge current operation and minimize total charging time.