The bq51013B device is a single-chip, advanced, flexible, secondary-side device for
wireless power transfer in portable applications capable of providing up to 5 W. The bq51013B
devices provide the receiver (RX) AC-to-DC power conversion and regulation while integrating the
digital control required to comply with the Wireless Power Consortium (WPC) Qi v1.2 communication
protocol. Together with the bq50012A primary-side controller (or other Qi transmitter), the
bq51013B enables a complete contactless power transfer system for a wireless power supply solution.
Global feedback is established from the secondary to the primary to control the power transfer
process using the Qi v1.2 protocol.
The bq51013B integrates a low-resistance synchronous rectifier, low-dropout regulator
(LDO), digital control, and accurate voltage and current loops to ensure high efficiency and low
The bq51013B also includes a digital controller that calculates the amount of power
received by the mobile device within the limits set by the WPC v1.2 standard. The controller then
communicates this information to the transmitter (TX) to allow the TX to determine if a foreign
object is present within the magnetic interface and introduces a higher level of safety within
magnetic field. This Foreign Object Detection (FOD) method is part of the requirements under the
WPC v1.2 specification.