General DescriptionThe LP4060A is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its SOT23-5 package and low external component count make the LP4060A ideally suited for portable applications. Furthermore, the LP4060A is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode 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 LP4060A 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 LP4060A automatically enters a low current state, dropping the battery drain current to less than 1μA. Other features include charge current monitor, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA/DSC
Bluetooth Applications
Features
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode Required
Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize
Charge Rate Without Risk of Overheating
4.2V/4.35V Charge Voltage with ± 1% Accuracy
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
2.9V Trickle Charge Threshold
C/10 Charge Termination
1uA Supply Current in Shutdown
Output OCP
Charging OTP
