SLUSBC8B December 2013  – March 2017


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
      1. 8.1.1A Brief Description of the Wireless System
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1 Details of a Qi Wireless Power System and bq51003 Power Transfer Flow Diagrams
      2. 8.3.2 Dynamic Rectifier Control
      3. 8.3.3 Dynamic Efficiency Scaling
      4. 8.3.4 RILIM Calculations
      5. 8.3.5 Input Overvoltage
      6. 8.3.6 Adapter Enable Functionality and EN1/EN2 Control
      7. 8.3.7 End Power Transfer Packet (WPC Header 0x02)
      8. 8.3.8 Status Outputs
      9. 8.3.9 WPC Communication Scheme
      10. 8.3.10Communication Modulator
      11. 8.3.11Adaptive Communication Limit
      12. 8.3.12Synchronous Rectification
      13. 8.3.13Temperature Sense Resistor Network (TS)
      14. 8.3.143-State Driver Recommendations for the TS-CTRL Pin
      15. 8.3.15Thermal Protection
      16. 8.3.16WPC v1.2 Compliance - Foreign Object Detection
    4. 8.4Device Functional Modes
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Applications
      1. 9.2.1bq51003 Wireless Power Receiver Used as a Power Supply
        1. Requirements
        2. Design Procedure
          1. the bq51003 as a Wireless Power Supply
          2. and Parallel Resonant Capacitor Selection
          3., CLAMP, and BOOT Capacitors
          4. Pins and CHG
          5. Limit and FOD
          6. and OUT Capacitance
        3. Curves
      2. 9.2.2Dual Power Path: Wireless Power and DC Input
        1. Requirements
        2. Design Procedure
        3. Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Development Support
    2. 12.2Receiving Notification of Documentation Updates
    3. 12.3Community Resources
    4. 12.4Trademarks
    5. 12.5Electrostatic Discharge Caution
    6. 12.6Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information


  • Integrated Wireless Power Supply Receiver Solution - Optimized for 2.5-W Applications
    • 93% Overall Peak AC-DC Efficiency
    • Full Synchronous Rectifier
    • WPC v1.2 Compliant Communication Control
    • Output Voltage Conditioning
    • Only IC Required Between Rx coil and Output
  • Wireless Power Consortium (WPC) v1.2 Compliant (FOD Enabled) Highly Accurate Current Sense
  • Dynamic Rectifier Control for Improved Load Transient Response
  • Dynamic Efficiency Scaling for Optimized Performance Over Wide Range of Output Power
  • Adaptive Communication Limit for Robust Communication
  • Supports 20-V Maximum Input
  • Low-power Dissipative Rectifier Overvoltage Clamp (VRECT-OVP = 15 V)
  • Thermal Shutdown
  • Multifunction NTC and Control Pin for Temperature Monitoring, Charge Complete and Fault Host Control


  • WPC Compliant Receivers
  • Cell Phones and Smart Phones
  • Headsets
  • Digital Cameras
  • Portable Media Players
  • Hand-held Devices


The bq51003 is an advanced, integrated, receiver IC for wireless power transfer in portable applications optimized for 2.5-W and below applications. The device provides the AC-DC power conversion while integrating the digital control required to comply with the Qi v1.2 communication protocol. Together with the bq500210 transmitter controller, the bq51003 enables a complete contact-less power transfer system for a wireless power supply solution. By using near-field inductive power transfer, the receiver coil embedded in the portable device receives the power transmitted by the transmitter coil through mutually coupled inductors. The AC signal from the receiver coil is then rectified and regulated to be used as a power supply for down-system electronics. Global feedback is established from the secondary to the transmitter to stabilize the power transfer process through back-scatter modulation. This feedback is established by using the Qi v1.2 communication protocol supporting up to 2.5-W applications.

The device integrates a low-impedance full synchronous rectifier, low-dropout regulator, digital control, and accurate voltage and current loops.

Device Information(1)

bq51003DSBGA (28)1.90 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Wireless Power Consortium (WPC or Qi) Inductive Power System

bq51003 fig1_lusbc8.gif

Revision History

Changes from A Revision (June 2016) to B Revision

  • Changed From: WPC v1.1 To: WPC v1.2 throughout the documentGo

Changes from * Revision (December 2013) to A Revision

  • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go
  • Removed Ordering Information table and Package Summary section, see POA at the end of the data sheet Go