TC4056A Description:
The TC4056A is a complete single lithium-ion battery with constant current/constant voltage linear charger. Its ESOP8/DIP8 package with a heat sink on the bottom and the low number of external components make the TC4056A ideal for portable applications.
The TC4056A can work with USB power supplies and adapter power supplies.
Due to the internal PMOSFET architecture and the anti-reverse charging path, no external isolation diode is required. The thermal feedback automatically adjusts 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 set externally via a resistor. When the charging current drops to 1/10 of the set value after reaching the final floating charging voltage, the TC4056A automatically terminates the charging cycle.
When the input voltage (AC adapter or USB power supply) is removed, the TC4056A automatically enters a low current state, reducing the battery leakage current to below 2uA. The TC4056A can also be placed in shutdown mode when powered to reduce the supply current to 55uA.
Additional features of the TC4056A include battery temperature detection, undervoltage latching, automatic recharging, and two LED status pins to indicate charge and end.
TC4056A Features:
Programmable charging current up to 1000mA
No MOSFETs, detection resistors, or isolation diodes required
Complete linear charger in SOP package for single lithium-ion batteries
Constant current/constant voltage operation and thermal regulation that maximizes charge rates without the risk of overheating
Accuracy up to ±1% of 4.2V preset charging voltage
Charge current monitor output for battery level detection
Automatic recharge
Charging status Dual output, no battery and fault status display
C/10 charge termination
The supply current in standby mode is 55uA
2.9V trickle charging device version
Soft start limits the surge current
Battery temperature monitoring function
TC4056A in 8-pin package (ESOP-8, DIP-8)
TC4056A Application:
Mobile phone, PDA
MP3, MP4 player
Digital camera
Electronic dictionary
GPS
Portable devices, various chargers
The TC4056A is suitable for applications requiring battery temperature detection, battery temperature anomaly indication and charging status indication:

The TC4056A is suitable for applications that require charging status indication and do not require battery temperature monitoring:
The TC4056A is suitable for applications that require neither a charge status indication nor a battery temperature monitoring function
The TC4056A is suitable for simultaneous application of USB interface and wall adapter charging:
The charging state of TC4056A is indicated by a red LED, and the charging end state is indicated by a green LED to increase the heat dissipation power resistance:

TC4056A pin arrangement

TC4056A functional block diagram
