Qi (WPC) Compliant Highly Integrated Secondary-Side Direct Lithium Ion Charger. - BQ51050B


Qi (WPC) Compliant Highly Integrated Secondary-Side Direct Lithium Ion Charger.



The bq5105x device is a high-efficiency, Qi-compliant wireless power receiver with an integrated Li-Ion/Li-Pol battery charge controller for portable applications. The bq5105xB devices provide efficient AC-DC power conversion, integrates the digital controller required to comply with Qi v1.1 communication protocol, and provides all necessary control algorithms needed for efficient and safe Li-Ion and Li-Pol battery charging. Together with the bq500212A transmitter-side controller, the bq5105x enables a complete wireless power transfer system for direct battery charger solutions. By using near-field inductive power transfer, the receiver coil embedded in the portable device can pick up the power transmitted by transmitter coil. The AC signal from the receiver coil is then rectified and conditioned to apply power directly to the battery.  Global feedback is established from the receiver to the transmitter to stabilize the power transfer process.  This feedback is established by using the Qi v1.1 communication protocol.

The bq5105xB devices integrate a low-impedance synchronous rectifier, low-dropout regulator (LDO), digital control, charger controller, and accurate voltage and current loops in a single package.  The entire power stage (rectifier and LDO) use low-resistance N-MOSFETs (100-mΩ typical Rdson) to ensure high efficiency and low power dissipation.


  • Single-Stage Wireless Power Receiver
    and Li-Ion/Li-Pol Battery Charger
    • Combines Wireless Power Receiver, Rectifier, and
      Battery Charger in a Single, Small
    • 4.20-V, 4.35-V, and 4.40-V Output Voltage
    • Supports a Charging Current up to 1.5 A
    • 93% Peak AC-DC Charging Efficiency
  • Robust Architecture
    • 20-V Maximum Input Voltage Tolerance,
      With Input Overvoltage Protection
    • Thermal Shutdown and Overcurrent Protection
    • Temperature Monitoring and Fault Detection
  • Compatible With WPC v1.1 Qi Industry Standard
  • Power Stage Output Tracks Rectifier and Battery
    Voltage to Ensure Maximum Efficiency Across the
    Full Charge Cycle
  • Available in Small DSGBA and VQFN Packages

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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)
Approx. Price (US$)
BQ51050B BQ51003 BQ51010B BQ51013B BQ51020 BQ51051B BQ51052B BQ51221
Receiver    Receiver    Receiver    Receiver    Receiver    Receiver    Receiver    Receiver   
5    2.5    5    5    5    5    5    5   
WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1    WPC 1.1 and PMA   
Tracks (Vbat+300mV)    Dynamic    Dynamic    Dynamic    Dynamic    Tracks (Vbat+300mV)    Tracks (Vbat+300mV)    Dynamic   
1.5    0.5    0.75    1.5    1    1.5    0.8    1   
4.2    5    7    5    8    4.35    4.4    8   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
  -40 to 85    -40 to 85      -40 to 125      0 to 125    -40 to 85   
28DSBGA    28DSBGA    20VQFN
28DSBGA    42DSBGA   
1.60 | 1ku    1.10 | 1ku    1.80 | 1ku    1.35 | 1ku    2.29 | 1ku    1.60 | 1ku    1.60 | 1ku    3.00 | 1ku