Diodes Incorporated
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AP9221 (Not Recommended for new design)

NRND = Not Recommended for New Design

High Accuracy Single Chip solution for 1-cell Battery Pack

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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
    • 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)


  • Li+ Rechargeable Battery Pack

Product Specifications

Product Parameters

0V Battery Charge Function Permission
Application 1-Cell
Compliance (Only Automotive supports PPAP) Standard
Built-In Dual NMOS (Y|N) Yes
Charge Overcurrent Detection Voltage VCOC (V) 0.019 to 0.03
Detection Delay Built-In Delay Timer
Discharge Overcurrent Detection Voltage VDOC (V) 0.03 to 0.19
Function Battery Protection
Load Short Detection Voltage VSHORT (V) 0.16 to 0.32
Overcharge Detection Voltage VCU (V) N/A
Overdischarge Detection Voltage VDL (V) 2 to 3.4
Power-Down Function Selectable
AEC Qualified No
RSS(ON) @VGS=3.9V (mΩ) 120

Technical Documents

Recommended Soldering Techniques



Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2642 2023-09-05 2024-03-05 Device End of Life (EOL)