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BL4054 800mA 单节锂电池智能充电管理IC
BL4054 DESCRIPTION
The BL4054 is a complete constant-current / constant voltage linear charger for single cell Lithium-Ion batteries. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET archite-cture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temper-ature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The BL4054 automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached.When the input supply (wall adapter or USB supply) is removed, the BL4054 automatically enters a low current state, dropping the battery drain current to less than 2μΑ. The BL4054 can be put into shutdown mode, reducing the supply current to 25μA.Other features include charge current monitor, under-voltage lockout, automatic recharge and a status pin to indicate charge termi-nation and the presence of an input voltage.
BL4054 FEATURES
· Programmable Charge Current Up to 800mA
· No MOSFET, Sense Resistor or Blocking Diode Required
· Preset 4.2V Charge Voltage with ±1% Accuracy
· Charge Current Monitor Output for Gas Gauging
· Thermal Regulation Maximizes Charge Rate Without Risk of Overheating
· Charges Single Cell Li-Ion Batteries Dire-ctly from USB Port
· Over-Voltage Protect
· Automatic Recharge
· Charge Status Output Pin
· C/10 Charge Termination
· 25μA Supply Current in Shutdown
· 2.9V Trickle Charge Threshold
· Soft-Start Limits Inrush Current
· Available in 5-Lead SOT-23 Package
BL4054 APPLICATIONS
· Cellular and Smart Phones
· Charging Docks and Cradles
· Blue Tooth Applications
· PDAs
· MP3 Players
