ME4055AM6G

ME4055A is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. Furthermore the ME4055A 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, and the charge current can be programmed externally with a single resistor. The ME4055A 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 ME4055A automatically enters a low current state dropping the battery drain current to less than 2μA. The ME4055A can be put into shutdown mode reducing the supply current to 55μA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status.

Applications

• Cellular Telephones, PDAs, MP3 Players
• Charging Docks and Cradles
• Bluetooth Applications

Key features

• Protection of battery cell reverse connection
• No MOSFET sense resistor or blocking diode required
• Complete Linear Charger in Thin SOT Package for Single Cell Lithium-Ion Batteries
• Constant-Current/Constant-Voltage operation with thermal regulation to maximize Rate Without risk of overheating.
• Preset 4.2V charge voltage with ±1% accuracy
• Automatic Recharge
• Charges Single Cell Li-Ion Batteries Directly from USB Port
• C/10 charge termination
• 55μA supply current in shutdown
• 2.9V trickle current charge threshold
• Soft-Start limits inrush current
• Charge Status Output Pin
• Available in SOT23-6 Package