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The AP9221 is a single chip protection solution specially designed for 1-cell Li+ rechargeable battery pack application. The AP9221 includes a 1-cell Lithium ion battery protection chip and dual N-CH MOSFET with common drain. The AP9221 provides rich battery protection features and can turn-off the N-CH MOSFET by detecting overcharge voltage/current, over discharge voltage/current, or load short circuit. The AP9221 has builtin fixed delay time to save external components. The AP9221 is available in the U-DFN2030-6 (Type C) package.
High Voltage CMOS Process, up to 24V (VDD to VM)
Low Quiescent Current (+25°C)
In Normal Mode, 3.0μA (Typ.), 4.5μA (Max.) VDD = 3.5V
In Power-Down Mode, 0.1μA (Max.)
High-Accuracy Voltage Detection Circuit (+25°C)
Overcharge Detection Voltage: 3.5V to 4.5V (5mV Steps) Accuracy-15mV, +25mV
Overcharge Hysteresis Voltage Range: 0.1V to 0.4V (50mV Steps) Accuracy ±50mV
Overdischarge Detection Voltage: 2.0V to 3.4V (10mV Steps) Accuracy ±35mV
Overdischarge Hysteresis Voltage Range: 0V to 0.7V (40mV Steps) Accuracy ±65mV