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LTC4096/LTC4096X - Dual Input Standalone Li-Ion Battery Chargers

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 LTC4096 terminates the charge cycle when the charge current drops below the user programmed termination threshold after the final float voltage is reached. The LTC4096 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 (LTC4096 only), automatic recharge, undervoltage lockout, charge status output and power present output with 120mA drive capability.

Features Charges Single-Cell Li-Ion Battery from Wall Adapter and USB Inputs Automatic Input Detection (DC Input has Charging Priority) Charge Current Programmable up to 1.2A from Wall Adapter Input C/X Charge Current Termination Input Power Present Output (PWR) with 120mA Drive Capability 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 Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package Typical Application

Applications Cellular Telephones MP3 Players Portable Handheld Devices Packaging

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