Description
The AP9221 is a single-chip protection solution specially designed for 1-cell Li+ rechargeable battery pack applications.
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, overdischarge voltage/current, or load short circuit. The AP9221 has built-in fixed delay time to save external components.
The AP9221 is available in the U-DFN2030-6 (Type C) package.

Features
• 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
   • Discharge Overcurrent Detection Voltage: 0.025V to 0.2V
      (10mV Steps) Accuracy ±12mV
   • Short Current Detection Voltage: 0.12V to 0.45V (50mV
      Steps) Accuracy ±50mV
   • Charge Overcurrent Detection Voltage: -0.2V to -0.025V
      (10mV Steps) Accuracy ±12mV
   • Overcharger Detection Voltage: 8.0V (Fixed) Accuracy ±2V
   • Overcharger Release Voltage: 7.3V (Fixed) Accuracy ±2V
• Built-In Fixed Detection Delay Time (+25°C), Accuracy ±20%
• Power-Down Mode Selectable (Yes or No)
• 0V Battery Charge Selectable (Permission or Inhibition)
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen- and Antimony-Free. “Green” Device (Note 3)
• For automotive applications requiring specific change
   control (i.e. parts qualified to AEC-Q100/101/200, PPAP
   capable, and manufactured in IATF 16949 certified facilities),
   please contact us or your local Diodes representative.
   https://www.diodes.com/quality/product-definitions/

Applications
• Li+ Rechargeable Battery Packs