充电电路
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充电电路
JW4056A
The JW4056 and JW4056A are complete constant-current/ constant-voltage Li-Ion and Li-Polymer linear chargers targeted at spaced-limited portable applications. Furthermore, the JW4056 and JW4056A are 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 (JW4056) or 4.35V (JW4056A), and the charge current can be programed externally. Thedevice terminates the charge cycle when the charge current drops to 1/10 of the presetting value after the final float voltage is reached.
When the input supply is removed, the JW4056/JW4056A enters a low current state, dropping the battery drain current to less than 1μA. The JW4056/JW4056A can be put into shutdown mode, reducing the supply current to 75μA during adaptor is present. The other features of JW4056/JW4056A include external battery temperature monitor, two open-drain outputs indicator, and automatic recharge function.
The JW4056/JW4056A guarantees robustness with input and battery reverse connection protection, input over voltage protection, thermal shutdown and under voltage lockout.
FEATURES
18-V Input Rating
Programmable Charge Current Up to 1A
Charging Management (Trickle Charge/ Constant Current Charge/ Constant Voltage Charge/ Charge Termination/Auto Recharge)
4.2V(JW4056) / 4.35V(JW4056A) Charge Voltage with ±1% Accuracy
2.9V Trickle Charge Threshold
1/10 ICHG Charge Termination
Soft-Start Limits Inrush Current
Operation Over JEITA Range via Battery NTC – 1/2 Fast-Charge Current at Cool, 4.04V at Warm
Input and Battery Reverse Polarity Protection, Input Over Voltage Protection, Input Under Voltage Lockout, Thermal Shutdown
Charge Status Indicators
Available in ESOP8 Package
APPLICATIONS
Portable Media Players, Digital Cameras
Bluetooth Applications
Toys
Li-Ion/ Li-Polymer Battery Powered Devices
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