ME4057-N is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries.With a thermally enhanced 8-PIN SOP package on the bottom and low external component count make the ME4057-N ideally suited for portable applications. Furthermore the ME4057-N 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-N automatically terminates the charge cycle when the charge current drops to 1/10ththe programmed value after the final float voltage is reached.

    When the input supply (wall adapter or USB supply) is removed the ME4057-N automatically enters a low current state dropping the battery drain current to less than 2μA.The ME4057-N can be put into shutdown mode reducing the supply current to 55μA.

    Other features include Battery temperature monitor, under-voltage lockout, automatic recharge and two status pins to indicate charge and charge termination.

Protection of battery cell reverse connection

Maximum operating voltage 9V, improve system reliability

Programmable charge current up to：1.3A (ESOP8) ；1 A（DFN2*2-8L）

Internal thermal feedback protection control system in reasonable charge range 

No MOSFET sense resistor or blocking diode required

Complete linear Charger in ESOP8 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/4.34V/4.4V charge voltage with ±1%accuracy

Automatic Recharge

Two Status Indication for Charge status, no battery and battery failure indicators

C/10 charge termination

55μA supply current in shutdown

2.9V trickle current charge threshold

Soft-Start limits inrush current

Battery Temperature Sensing

Cellular Telephones, Digital Still Cameras

MP3 Players

Bluetooth Applications

Portable Devices

ME4057-N Selection Guide：


ME4057-N Pin Configuration：


ME4057-N Pin Assignment：


ME4057-N Block Diagram：


ME4057-N Typical Application：

    Mainly used in Cellular telephones, MP3, MP4 players, digital still cameras, electronic dictionary, GPS, portable 

devices and vary chargers.

1. Suitable for the function of battery’s temperature detection, the application of the indicator of battery’s 

temperature anomaly and charge status.


2. Suitable for the application of USB power and the charge of wall adapter

3. Suitable for charge status indicator, which the application not need battery’s temperature detection

4. Suitable for the application which not need charge status indicator and battery’s temperature detection.

5. Add a resistor for power dissipation, Red LED for charge status, green LED for charge terminate state