充电电路
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充电电路
JW3665B
The JW3665x series of devices are complete constant-current/ constant-voltage Li-Ion and Li-Polymer linear chargers targeted at spaced-limited portable applications. Furthermore, the devices 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 (JW3665) or 4.35V (JW3665A) or 4.33V (JW3665B), and the charge current can be programed externally. The JW3665x terminates the charge cycle when the charge current drops to termination threshold (1/10 of presetting charge current or fixed at 6.5mA) after the final float voltage is reached.
When the input supply is removed, the JW3665x enters a low current state, dropping the battery drain current to less than 1μA. The JW3665x can be put into shutdown mode, reducing the supply current to 75μA during adaptor is present. The other features of JW3665x include external battery temperature monitor, two open-drain outputs indicator, and automatic recharge function.
The JW3665x 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 1A
Fixed 6.5mA (10mA max) or 1/10 ICHG Charge Termination Configurable
Operation Over JEITA Range via Battery NTC – 1/2 Fast-Charge Current at Cool, 4.04V at Warm
Input Reverse Polarity Protection
Battery Reverse Polarity Protection
Charging Management (Trickle Charge, Constant Current Charge, Constant Voltage Charge, Charge Termination, Auto Recharge)
4.2V (JW3665) / 4.35V(JW3665A) / 4.33V (JW3665B) Charge Voltage with ±1% Accuracy
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Input Under Voltage Lockout, Thermal Shutdown
Charge Status Indicators – Charging/ Done
Available in DFN2x2-8 Package
APPLICATIONS
Portable Media Players, Digital Cameras
Bluetooth Applications
Toys
Li-Ion Battery Powered Devices
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