充电电路
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充电电路
JW4054A
The JW4054 and JW4054A are complete constant-current/ constant-voltage Li-Ion and Li-Polymer linear chargers targeted at spaced-limited portable applications. Furthermore, the JW4054 and JW4054A 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 (JW4054) or 4.35V (JW4054A), and the charge current can be programed externally. The device 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 JW4054 /JW4054A enters a low current state, dropping the battery drain current to less than 1μA. The JW4054/JW4054A can be put into shutdown mode, reducing the supply current to 75μA during adaptor is present. The other features of JW4054/JW4054A include an open-drain output indicator, and automatic recharge function.
The JW4054/JW4054A guarantees robustness with input and battery reverse connection protection, input under voltage lockout, input over voltage protection and thermal shutdown.
FEATURES
18V Input Rating, 7.5V Input Over Voltage Protection
Programmable Charge Current Up to 500mA
Input Reverse Polarity Protection
Battery Reverse Polarity Protection
Charging Management (Trickle Charge, Constant Current Charge, Constant Voltage Charge, Charge Termination, Auto Recharge)
4.2V(JW4054) / 4.35V(JW4054A) Charge Voltage with ±1% Accuracy
2.9V Trickle Charge Threshold
1/10 ICHG Charge Termination
Soft-Start Limits Inrush Current
Input Under Voltage Lockout, Thermal Shutdown
Charge Status Indicator
Available in SOT23-5 Package
APPLICATIONS
Portable Media Players, Digital Cameras
Bluetooth Applications
Toys
Li-Ion Battery Powered Devices
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