LTC4078

LTC4078/LTC4078X Dual Input Li-Ion Battery Charger with Overvoltage Protection FEATURES n 22V Maximum Voltage for Wall Adapter and USB Inputs n Charge Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs n Automatic Input Power Detection and Selection n Charge Current Programmable Up to 950mA from Wall Adapter Input n Overvoltage Lockout for Wall Adapter and USB Inputs n Battery Detection Input Disables Charger When No Battery is Present n No External MOSFET, Sense Resistor or Blocking Diode Needed n Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* n Preset Charge Voltage with ±0.6% Accuracy n Programmable Charge Current Termination n 40μA USB Suspend Current in Shutdown n Charge Status Output n Automatic Recharge n Available Without Trickle Charge (LTC4078X) n Available in a Thermally Enhanced, Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package APPLICATIONS n Cellular Telephones n Handheld Computers n Portable MP3 Players n Digital Cameras DESCRIPTION The LTC®4078/LTC4078X are standalone linear chargers that are capable of charging a single-cell Li-Ion/Polymer 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. The LTC4078/LTC4078X feature a maximum 22V rating for both wall adapter and USB inputs, although charging stops if the ...