The RT3181C is a highly integrated and scalable solution for wireless power transmitter applications. The RT3181C is designed to support the major wireless power standards - WPC (Qi). The RT3181C can be configured to various types of transmitter according to WPC specification.

The RT3181C supports fully integrated design for WPC Base Power Profile A11 transmitter which could be powered from a 5V output of USB or AC adaptor in low power applications. The RT3181C is able to support WPC MP-A5/MP-A11 transmitter design with external power stage for medium power applications.

The RT3181C can be paired with a Smart AC adapter from selected suppliers to provide reduced system cost and optimal efficiency over the range of power usage.


  • Mobile Phones
  • Phablets, Tablets
  • Wearable Devices
  • Medical and Industrial
Key Spec.
Status Active
Vin (min) (V) 17
Vin (max) (V) 5
Iin (max) (A) 2
Power Rating (W) 15
WPC Protocol EPP
Compliance Ver WPC 1.2.4
Features 1.8V LDO PMU;3.3V LDO PMU;5V Buck PMU;Aux ADC Input;Buck-boost controller;Current sensing amplifier;Die Temperature Sensor;I2C Master;I2C Slave;LED driver;OCP;OTP;OVP;QC Interface
Package Type WQFN6x6-48
  • Wireless Power Transmitter Compliant
    ► WPC qi V1.3
  • High Integration with Internal H-Bridge Power Stage and Current Sense Amplifier, Optimized for LP-A11 Solution
  • High Power with External Power Stage, Optimized for MP-A5/MP-A11 Solution
  • No Current Transformer Required
  • Low Quiescent Current Plus
    ► Selectable Ping Cycle in Custom Applications
    ► Low Current Sleep Mode Options including “Off” State with Wake Up I/O Pin
  • Programmable Thermal Protection
  • Support Foreign Object Detection
  • Support Fan Speed Control
  • Notifications
    ► 1 Buzzer
    ► 2 LEDs, Resistor Programmable
  • I2C Host Applications Interface (Option)
  • Internal Watchdog Timer
  • WQFN-48L 6x6mm Package
TitleLast UpdateDownload
Wireless Power Transmitter for 15W Solution2019/01/21
Technical Documents
TitleLast UpdateDownload
Richtek Featured Product Tree [Aug., 2023]2023/08/07
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT3181CGQWWQFN6x6-482500 Request Buy from Distributor