4056Q Overview:
4056Q is a linear lithium-ion battery charger chip, mainly used for single lithium battery charging. No external detection resistance is required, the internal MOSFET structure, so no external reverse diode is required.
The 4056Q can automatically adjust the charging current to limit the chip temperature. Its termination charging voltage is fixed at 4.2V, and the charging current can be adjusted by an external resistor. When the floating charge voltage is reached and the charging current drops to 1/10 of the set circuit, the 4056Q automatically terminates the charging process. When the input voltage is removed, the 4056Q automatically enters low current mode, drawing less than 2uA of current from the battery. When the 4056Q enters standby mode, the power supply current is about 60uA.
4056Q has the function of battery temperature detection, CE enable, can also monitor the charging current, has the characteristics of voltage detection, automatic cycle charging, and has two indicating pins to indicate the charging state, charging termination state and input voltage state.
4056Q Features:
Programmable charging current up to 1000mA
No external MOSFETs, detection resistors, reverse diodes required
Constant current/constant voltage mode operation, with thermal protection function
The lithium battery can be charged via the USB port
Preset charging voltage with ±1% accuracy
In standby mode, the power supply current is about 60uA
2.9V trickle charging voltage
Soft start limits the surge current
Battery temperature detection function
CE Enables the function
Available in DFN-8 (3 x 2 x 0.5) package
4056Q Applications:
Cell phone, PDA
Portable devices, various chargers
Electronic dictionary
Digital camera
GPS
MP3, MP4 player
4056Q Application circuit：
4056Q管脚图及功能说明：
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