TC4056A Description：
    TC4056A is a complete single cell lithium-ion battery with a constant current/constant voltage linear charger. With fewer external components, TC4056A is an ideal choice for portable applications. TC4056A is suitable for working with USB power supplies and adapter power supplies.
    Due to the use of internal PMOSFET architecture and anti reverse charging circuit, there is no need for external isolation diodes. Thermal feedback can automatically adjust the charging current to limit the chip temperature under high-power operation or high ambient temperature conditions. The charging voltage is fixed at 4.2V, while the charging current can be externally set through a resistor. When the charging current drops to 1/10 of the set value after reaching the final float voltage, TC4056A will automatically terminate the charging cycle.
    When the input voltage (AC adapter or USB power supply) is removed, TC4056A automatically enters a low current state, reducing the battery leakage current to below 2uA. TC4056A can also be placed in shutdown mode when there is power, thereby reducing the power supply current to below 55uA.
    Other features of TC4056A include battery temperature detection, undervoltage lockout, automatic recharging, LED display of charging status, and BAT short circuit protection (without battery reverse connection protection function).

TC4056A Features：

Programmable charging current up to 1000mA
No MOSFET, sensing resistor or isolation diode required
A complete linear charger for single lithium-ion batteries
Constant current/constant voltage operation, with thermal regulation function that maximizes charging rate without overheating hazard
4.2V preset charging voltage with an accuracy of ± 1%
Charging current monitor output for battery level detection
Automatic Recharge
Charging status dual output, no battery, and fault status display
C/10 charging terminated
The power supply current in standby mode is 55uA
2.9V trickle charger version
Soft start limits surge current
Battery temperature monitoring function
Adopting SOP-8/SOP-8/DFN-8 packaging

TC4056A Applications:
Mobile phone, PDA
MP3 and MP4 players
Digital camera
Electronic dictionary
GPS
Portable devices, various charging options

TC4056A Packaging form：
ESOP-8/DFN-8（2*2*0.85）

TC4056A Typical Application Circuit:

TC4056A Block diagram and working principle: