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LTC4097 - USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger

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 external resistor. The LTC4097 terminates the charge cycle when the charge current drops below the user programmed termination threshold after the final float voltage is reached. The LTC4097 can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µA even with power applied to both inputs.

Other features include trickle charge, automatic recharge, undervoltage lockout, charge status output, an NTC thermistor input used to monitor battery temperature and VNTC power present output with 120mA drive capability.

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 Qualified 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 Typical Application

Applications Cellular Telephones MP3 Players Portable Handheld Devices Packaging

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