LTC4055

LTC4055/LTC4055-1 USB Power Controller and Li-Ion Charger FEATURES DESCRIPTION n Charges Single-Cell Li-Ion Batteries Directly from USB Port n Load Dependent Charging Guarantees USB Input Current Compliance n Automatic Battery Switchover When Input Supply is Removed n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating* n Selectable 500mA/100mA Current Limit n Low Loss Full PowerPath™ Control with Ideal Diode Operation (Reverse Current Blocking) n Preset 4.2V Charge Voltage with 0.8% Accuracy (4.1V for LTC4055-1) n 4.1V Float Voltage (LTC4055-1) Improves Battery Life and High Temperature Safety Margin n USB-Compliant Suspend Mode n Programmable Charge Current and Termination Timer n Soft-Start Limits Inrush Current n NTC Thermistor Input for Temperature Qualified Charging n Tiny (4mm × 4mm × 0.75mm) QFN Package APPLICATIONS n Portable USB Devices: Cameras, MP3 Players, PDAs L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patent, including 6522118. The LTC®4055/LTC4055-1 are USB power manager and Li-Ion battery chargers designed to work in portable battery-powered applications. The parts manage and limit the total current used by the USB peripheral for operation and battery charging. Depending on the state of the current select pin (H...