DESCRIPTION
The LTC®4097 is a standalone linear battery charger that is capable of charging a single-cell Li-Ion or Li-Polymer battery from both wall adapter and USB inputs. The charger can detect power at the inputs and automatically select the appropriate power source for charging.

FEATURES
■ Charges Single-Cell Li-Ion/Polymer Battery from
   Wall Adapter and USB Inputs
■ Automatic Input Detection (Wall Adapter Input has
   Charging Priority)
■ Charge Current Programmable up to 1.2A from
   Wall Adapter Input
■ Programmable Charge Current Termination
■ NTC Thermistor Input for Temperature Qualifi ed
   Charging
■ Independent DC, USB Charge Current Programming
■ Preset Float Voltage with ±0.6% Accuracy
■ Thermal Regulation Maximizes Charge Rate Without
   Risk of Overheating*
■ Charge Status Output
■ Automatic Recharge
■ 20µA Charger Quiescent Current in Shutdown
■ Available in a Thermally Enhanced, Low Profi le
   (0.75mm) 12-Lead (3mm × 2mm) DFN Package

APPLICATIONS
■ Cellular Telephones
■ MP3 Players
■ Portable Handheld Devices