LTC4085-1 Datasheet | Linear Technology

Features USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger DESCRIPTIO - Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall Adapter - 215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss Power Path TM When Wall Adapter/USB Input Not Present - Load Dependent Charging Guarantees Accurate USB Input Current pliance - 4.1V Float Voltage Improves Battery Life Span and High Temperature Safety Margin - Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating- - Selectable 100% or 20% Input Current Limit (e.g., 500m A/100m A) - Battery Charge Current Independently Programmable Up to 1.2A - Preset 4.1V Charge Voltage with 0.8% Accuracy - C/10 Charge Current Detection Output - Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package U APPLICATIO S - Portable USB Devices: Cameras, MP3 Players, PDAs , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Power Path is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364. Other patents pending. The LTC®4085-1 is a USB power manager and Li-Ion battery charger designed for portable battery-powered applications. The part controls the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 20% or 100% of a programmed value up to 1.5A (typically 100m A or 500m A). Battery charge current is automatically reduced such that the sum of the load current and charge current does not exceed the programmed input current limit. The LTC4085-1 includes a plete constant-current/ constant-voltage linear charger for single cell Li-Ion batteries. This 4.1V version of the standard LTC4085 is intended for applications which will be operated or stored above approximately 60°C. Under these conditions, a...