The P9221-R3 is a high efficiency 15W magnetic induction wireless power receiver with in-band, bi-directional data communication with no additional circuitry. The communication channel can be used for proprietary device authentication and secure system data transfer. 

The P9221-R3 integrates a 32-bit ARM Cortex®-M0 processor, low RDS(ON) synchronous rectifier, and ultra-low dropout regulator making it ideal for high-efficiency, space-constrained receiver applications. The device features a programmable output voltage, current limitation, and foreign-object detection (FOD) settings. An I²C serial interface allows reading information such as voltage, current and fault conditions. The device also features a patented over-voltage protection scheme eliminating the need for additional capacitors, which can minimize the external component count and cost. Combined with the P9242-R3 transmitter, the P9221-R3 forms complete wireless power system solution for 15W applications with bi-directional communication.

The P9221-R3 is provided in a 52-WLCSP package (2.64 × 3.94 mm, 0.4 mm pitch), and it is rated for a 0 to +85°C ambient operating temperature range.


  • Supports bi-directional data communication 
  • Enables authentication and system data transfer
  • Single-chip solution supporting applications with up to 15W
  • Patented over-voltage protection clamp eliminating external capacitors
  • 87% peak DC-to-DC efficiency when combined with the P9242-R3
  • Proprietary coil alignment guide
  • Programmable output voltage and current limit
  • Embedded 32-bit ARM® Cortex®-M0 processor
  • Dedicated remote temperature sensing
  • Standard device compliant with WPC-1.2 specification
  • Supports I²C interface
  • 0 to +85°C ambient operating temperature range
  • 2.64 x 3.94 mm 52-WLCSP package

Product Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Active WLCSP 52 I Yes Reel

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
P9221-R3 Short-Form Datasheet Short Form Datasheet PDF 137 KB
P9221-R3 Datasheet Datasheet PDF 1.54 MB
Application Notes & White Papers
Wireless Power Transmission Resonance LC Calculations Application Note PDF 3.74 MB
Tuning Qi and AirFuel / PMA Inductive Resonance Circuits for Optimal Efficiency White Paper PDF 627 KB
IDT WLCSP Implementation Guidelines Application Note PDF 662 KB
PCN# : WP2002-01 TSMC Fab 6 Qualified as Alternate Fab Location Product Change Notice PDF 752 KB
Wireless Power Products Overview Overview PDF 1.14 MB

Boards & Kits

Part Number Title Type Company
WP15WBD-RK 15W Wireless Charging Solution with Bi-Directional Data Communication Evaluation Renesas