Integrated Wireless Power Li-Ion Charger Receiver, Qi (WPC) Compliant - BQ51051B


Integrated Wireless Power Li-Ion Charger Receiver, Qi (WPC) Compliant


The bq5105x is a high efficiency, wireless power receiver with Li-Ion/Li-Pol battery charge controller for portable applications. The bq5105x device provides efficient AC/DC power conversion, integrates digital controller required to comply with Qi v1.1 communication protocol and all necessary control algorithms needed for efficient and safe Li-Ion and Li-Pol battery charger. Together with bq500210 transmitter-side controller, the bq5105x enables a complete wireless power transfer system for direct battery charger solution. By utilizing 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 in order to stabilize the power transfer process.  This feedback is established by utilizing the Qi v1.1 communication protocol.

The bq5105x devices integrate a low-impedance synchronous rectifier, low-dropout regulator, digital control, charger controller, and accurate voltage and current loops in a single package.  The entire power stage (rectifier and LDO) utilize low resistive N-MOSFET’s (100mΩ typical Rdson) to ensures high efficiency and low power dissipation.

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  • Single-Stage Wireless Power Receiver
    and Li-Ion/Li-Pol Battery Charger
    • Combines Wireless Power Receiver,
      Rectifier and Battery Charger in a
      Single Small Package
    • 4.2V and 4.35V Output Voltage Options
    • Supports up to 1.5A Charging Current
    • 93% Peak AC-DC Charging Efficiency
  • Robust Architecture
    • 20V Maximum Input Voltage Tolerance,
      with Input OV Protection Clamp
    • Thermal Shutdown and Over Current Protection
    • Temperature Monitoring and Fault Detection
  • Compatible with WPC v1.1 “Qi” Industry
  • Power Stage Output Tracks Rectifier and Battery
    Voltage to Ensure Maximum Efficiency Across the
    Full Charge Cycle
  • Available in small WCSP and QFN packages

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Parametrics Compare all products in Wireless Power Solutions

Pout (Typ) (W)
Vin (Max) (V)
Vrect (reg) (V)
Iout (Max) (A)
Vout (regulated) (V)
Approx. Price (US$)
BQ51051B BQ51050B
Receiver     Receiver    
5     5    
20     20    
Tracks (Vbat + 300mV)     Tracks (Vbat+300mV)    
1.5     1.5    
4.35     4.2    
Catalog     Catalog    
1.90 | 1ku     1.90 | 1ku    

Companion parts

Part # Name Product Family Comments
BQ51050B   Qi (WPC) Compliant Highly Integrated Secondary-Side Direct Lithium Ion Charger.   BATTERY MANAGEMENT PRODUCTS - Wireless Power Solutions    
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