Easy to Use Power Bank Solution (EZPBS®) Integrated Chip with Switch Charger, ADC, and Load switch


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The RT9481 is a high integration and easy to use power solution for Li-ion power bank and other powered handheld applications. We call it EZPBS® (Easy to Use Power Bank Solution). This single chip includes a Switching Charger with Boost function, Analog to Digital Converter (ADC), USBOUT Load Switch, Adapter Detection with BC1.2, DCP controller and LDO.


  • Power Bank
Key Spec.
Status Active
Vin (min) (V) 4.3
Vin (max) (V) 5.65
Battery Charge Voltage (max) (V) 4.6
Battery Charge Current (max) (A) 2.7
Status Indicator No
Charger Type Switching
Input Source AC Adapter;USB
Features Cycle-by-Cycle Current Limit;OCP;OVP;SCP;UVP
Package Type WQFN4x4-24
Built-in Power MOSFETs Yes
  • High Accuracy Voltage/Current Regulation
    ► ±1% Charge Voltage Regulation
    ► ±0.1A Charge Current Regulation
    ► ±3% Boost USBOUT Voltage Regulation
  • Thermal Shutdown Protection
  • Reverse Leakage Protection to Prevent Battery Drainage.
  • Built-In USBOUT DCP Controller
  • Built-In USBOUT Attach/Detach Detection
  • Built-In USBOUT Light Load Detection
  • Built-In Load Switch with Current Regulation
  • Thermal Regulation and Output Short Current Protection
  • Built-In Adapter Detection with BC1.2
  • Built-In Accurate ADC to Measure VBAT, VBUS, TS, IBAT , USBOUT and IUSBOUT
  • Built-In LDO
  • Interrupt Output for Event Notification
  • I2C Interface with 400kHz
    Charge Mode
  • Charge Voltage Regulation : 3.65V to 4.6V
  • Charge Current Regulation : 0.7A to 2.7A
  • Minimum Input Voltage Regulation (MIVR) : 4.2V to 4.8V
  • Average Input Current Regulation (AICR) : 0.1A to 2A
  • Charge Termination Current : 0.15A to 0.6A
  • Pre-charge Threshold : 2.3V to 3.8V
  • Pre-charge Current : 0.2A to 0.5A
  • Thermal Regulation
  • VMID Under Voltage Protection
  • VBUS Over Voltage Protection
  • Battery Over Voltage Protection
  • Bad Adapter Detection
    Boost Mode
  • Boost Output Current Up to 3A
  • Boost Output Voltage : 3.65V to 5.2V
  • Battery Under Voltage Protection : 2.5V to 3.2V
  • VMID Over Voltage Protection
TitleLast UpdateShareDownload
Easy to Use Power Bank Solution (EZPBS®) Integrated Chip with Switch Charger, ADC, and Load switch2015/06/25
Technical Documents
TitleLast UpdateShareDownload
Power Mangement Components for Lithium-Ion Battery Powered Applications2018/11/15