LTC4075

U U FEATURES ■ Charges Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs ■ Automatic Input Power Detection and Selection ■ Charge Current Programmable up to 950mA from Wall Adapter Input ■ No External MOSFET, Sense Resistor or Blocking Diode Needed ■ Thermal Regulation Maximizes Charging Rate Without Risk of Overheating* ■ Preset Charge Voltage with ±0.6% Accuracy ■ Programmable Charge Current Termination ■ 18µA USB Suspend Current in Shutdown ■ Independent “Power Present” Status Outputs ■ Charge Status Output ■ Automatic Recharge ■ Available Without Trickle Charge (LTC4075X) ■ Available in a Thermally Enhanced, Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package U APPLICATIO S ■ Cellular Telephones ■ Handheld Computers ■ Portable MP3 Players ■ Digital Cameras LTC4075/LTC4075X Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers DESCRIPTIO The LTC®4075/LTC4075X are standalone linear chargers that are capable of charging a single-cell Li-Ion battery from both wall adapter and USB inputs. The chargers can detect power at the inputs and automatically select the appropriate power source for charging. No external sense resistor or blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the battery charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The float voltage is fixed at 4.2V and the charge current is programmed with an exter...