LTC4061 Datasheet | Linear Technology

Features n Charge Current Programmable Up to 1A n Charges Single-Cell Li-Ion Batteries Directly from USB Port n Preset Charge Voltage with ±0.35% Accuracy n Thermistor Input for Temperature Qualified Charging n Input Supply Present Logic Output n Thermal Regulation Maximizes Charge Rate Without Risk of Overheating n Programmable Charge Current Detection/ Termination n Programmable Charge Termination Timer n Smart Pulsing Error Feature n Smart Start™ Prolongs Battery Life n 20µA Charger Quiescent Current in Shutdown n Available in a Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package Applications n Handheld puters n Portable MP3 Players n Digital Cameras L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Smart Start, Thin SOT and Power Path are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6522118. Standalone Linear Li-Ion Battery Charger with Thermistor Input Description The LTC®4061 is a full-featured, flexible, standalone linear charger for single-cell Lithium-Ion batteries. It is capable of operating within USB power specifications. Both programmable time and programmable current based termination schemes are available. Furthermore, the CHRG open-drain status pin can be programmed to indicate the battery charge state according to the needs of the application. Additional safety Features designed to maximize battery lifetime and reliability include NTC battery temperature sensing and the Smart Start charging algorithm. No external sense resistor or external blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The charge current is programmed with an external resistor. With power applied, the LTC4061 can be put into shutdown mode to...