REV LETTER: A
CYG Wayon Circuit protection Co., Ltd.
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No. 1001, Shiwan Qi Road, Pudong Area, Shanghai
Tel: 86-21- 50310888 50968308
The WP3880 provides complete Li+ charger protection against Input over-voltage, input over-current and thermal
shutdown protection is also available. When any of the monitored parameters is over the threshold, the IC turns off the
charging current. All protections also have deglitch time against false triggering due to voltage spikes or current transients.
The system is positive overvoltage protected up to +30V. Thanks to a very low current consumption, the USB charge is
compatible with this integrated component.
The WP3880 provides complete Li+ charger protections, and saves the external MOSFET and Schottky diode for the
charger of cell phone’s PMIC. This device uses internal PMOS FET, making external devices unnecessary, which reduces
the system cost and PCB area of the application board. The above features and small package make the WP3880 an ideal
part for cell phones applications. WP3880 is able to instantaneously disconnect the output from the input if the input voltage
exceeds the overvoltage threshold. Additional overcurrent protection function allows turning off internal PMOS FET when the
charge current exceeds current limit, which is externally selectable.
The current limit value can be modified with control logic pin to divide it by internal gain, allowing USB100 mA/500mA
charging or USB/Wall adapter charging up to overcurrent threshold. At the same time, Li ion Battery voltage is continuously
monitored, providing more safety during the charge.
WP3880 provides a negative going flag (FLAG) output, which alerts the system that a fault has occurred as overvoltage
(power supply or battery voltage), overcurrent or thermal event.
Overvoltage Protection Up to +30V
Fast Turn Off Time
Very Low Current Consumption/USB Compliant
Li ion Battery Voltage Monitoring
Overvoltage Lockout (OVLO)
Under-voltage Lockout (UVLO)
Overcurrent Protection Externally Adjustable (OCP) up to 2.8A
Shutdown EN and Gain Input Pins
Soft−Start to Eliminate Inrush Current
Alert FLAG Output
Compliance to IEC61000-4-2 (Level 4): 8kV (Contact), 15kV (Air) bypassed with a 1μF or larger capacitor.
ESD Ratings: Machine Model = B; Human Body Model = 2.
Specifications are subject to change without notice
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