General Description:

The AX4056is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ESOP8 package and low external component count make the AX4056 ideally suited for portable applications. Furthermore, the 

AX4056is 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 AX4056automatically terminates the charge cycle when the charge current drops to 1C/10th the 

programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the AX4056automatically 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.

Features :

Protection of Reverse Connection of Battery

Programmable Charge Current Up to 1000mA

No MOSFET, Sense Resistor or Blocking Diode Required

Constant-Current/Constant-Voltage Operation with 

Thermal Regulation to Maximize Charge Rate Without 

Risk of Overheating

1µA Supply Current in Shutdown

Drainage Charge Current Thermal Regulation Status 

Outputs for LED or System Interface

Indicates Charge and Full

Optional Battery Temperature Monitoring Before and 

During Charge Automatic Sleep Mode for Low-Power

Consumption Available in ESOP-8 Package

RoHS Compliant and 100% Lead (Pb)-Free

Applications

Portable Media Players/MP3 players

Cellular and Smart mobile phone

PDA/DSC

Bluetooth Applications