ME4057ASPG

ME4057 is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. With a thermally enhanced 8-PIN ESOP package on the bottom and low external component count make the ME4057 ideally suited for portable applications. Furthermore the ME4057 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 PMOSFET 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/4.34V/4.4V, and the charge current can be programmed externally with a single resistor. The ME4057 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.

Applications

• Cellular Telephones
• Digital Still Cameras
• MP3 Players
• Bluetooth Applications
• Portable Devices
• USB Bus-Powered Chargers

Key features

• When the input supply (wall adapter or USB supply) is removed the ME4057 automatically enters a low current state dropping the battery drain current to less than 2μA.
• The ME4057 can be put into shutdown mode reducing the supply current to 55μA.
• Battery temperature monitor
• Under-voltage lockout
• Automatic recharge
• Two status pins to indicate charge and charge termination