LT***054 锂电池充电管理 深圳原装现货供应

General Description
The LT***054 is a complete c***tant-current/c***tantvoltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count make the LT***054 ideally suited for portable applicati***. Furthermore, the LT***054 is s pecifically designed to work within USB power external sense resistor is needed, and no blockingdiode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LT***054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed,the LT***054 automatically enetrs a low current state,dropping the battery drain current to less than 2μA. The LT***054 can be put into shudtown mode, reducing he supply current to 25μA.Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.
Features
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode Required
Complete Linear Charger in ThinSOT Package for
Single Cell Lithium-ion Batteries
C***tant-Current/C***tant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly from USB Port
Preset 4.2V Charge Voltage with &plu***n; 1% Accuracy
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Soft-Start Limits Inrush Current
***ailable in 5-Lead SOT-23 Package
2.9V Trickle Charge Threshold
C/10 Charge Termination
25mA Supply Current in Shutdown
2.9V Trickle Charge Threshold
Applicati***
Portable Media Players/MP3 players
Cellular and ***art mobile phone
Charging Docks and Cradles
Bluetooth Applicati***