BQ51221 (ACTIVE)

Dual Mode 5-W (WPC and PMA) Single Chip Wireless Power Receiver



The bq51221 device is a fully contained wireless power receiver capable of operating in both the WPC and PMA protocols which allows a wireless power system to work with both WPC and PMA inductive charging standards. The bq51221 device provides a single device power conversion (rectification and regulation) as well as the digital control and communication for both standards. It also has autonomous detection of protocol and requires no additional active devices. The bq51221 device complies with the WPC v1.1 and PMA communication protocol. Together with the WPC or a PMA primary-side controller, the bq51221 device enables a complete wireless power transfer system for a wireless power supply solution. The receiver allows for synchronous rectification, regulation and control and communication to all exist in a market-leading form factor, efficiency, and solution size.


  • Robust 5-W Solution With 50% Lower Losses
    for Improved Thermals
    • Inductorless Receiver for Lowest Height
      Profile Solution
    • Adjustable Output Voltage (4.5 to 8 V) for
      Coil and Thermal Optimization
    • Fully Synchronous Rectifier With 96%
    • 97% Efficient Post Regulator
    • 79% System Efficiency at 5 W
  • WPC v1.1 and PMA Compliant Communication
  • Patented Transmitter Pad Detect Function
    Improves User Experience
  • I2C Communication with Host

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Parametrics Compare all products in Wireless Power Solutions

Pout (Typ) (W)
Vrect (reg) (V)
Iout (Max) (A)
Vout (regulated) (V)
Operating Temperature Range (C)
BQ51221 BQ51003 BQ51010B BQ51013B BQ51020 BQ51021 BQ51050B BQ51222
Receiver    Receiver    Receiver    Receiver    Receiver    Receiver    Receiver    Receiver   
5    2.5    5    5    5    5    5    5   
WPC 1.1 and PMA    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.2 and PMA   
Dynamic    Dynamic    Dynamic    Dynamic    Dynamic    Dynamic    Tracks (Vbat+300mV)    Dynamic   
1    0.5    0.75    1.5    1    1    1.5    1   
8    5    7    5    8    8    4.2    8   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85    0 to 125    -40 to 125    -40 to 125    0 to 125    -40 to 125   
42DSBGA    28DSBGA    28DSBGA    20VQFN
42DSBGA    42DSBGA    20VQFN