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More power to wireless charging!

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Extended Power Profile or EPP offers the minimum set of features for power transmitters and power receivers that can transfer between 5W to 15W of power.  The demand for middle power charging arises from newer technological devices that consume more power. These include IoT devices, fast-charge smartphones, medical devices and tablets. They can also prove useful in bigger environments like condominiums and automated manufacturing facilities.

With the incorporation of wireless charging in iPhones, this technology is set to become even more widespread. Avnet offers a number of solutions for middle power charging solutions that meet WPC standards and the need for more power in wireless charging.

Solutions with various key components:

Mixed Media - st mp solution -1

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STMicroelectronics – Middle Power Solution



  • Digital controller for wireless battery charger transmitter
  • 15 W single coil inductive transmitters optimized for:
  • Support for Wireless Power Consortium (WPC) 1.2 EPP 15 W certified applications
    • Backward compatible with 5 W WPC 1.1 applications
  • Support for half bridge topology with DC/DC
  • VIN range: 5 V ~12V
  • Active presence detector
  • Foreign object detection
  • Q-factor measurement
  • Parametric customization via GUI
  • Turnkey firmware solution
  • Peripherals
    • 10-bit ADC
    • UART interface
    • I2 C master fast/slow speed rate
    • GPIOs
  • Transmitter reference design:
    • WPC Qi 1.2.3 certified
    • MP-A10 single coil 15 W topology
    • Evaluation board order code: STEVAL-ISB044V1
    • 2-layer PCBs
    • Active object detection
    • Graphical User Interface for application monitoring
  • Operating temperature: -40 °C up to 105 °C
  • Package: VFQFPN32 - 5 x 5mm


  • Up to 15 W output power in Rx mode
  • Supporting Tx mode
  • Qi 1.2 and AirFuel inductive wireless standard communication protocols
  • Integrated high efficiency synchronous rectifier
  • Low drop regulator with output current and input voltage regulation loops
  • Total system efficiency up to 80%
  • 32-bit, 32 MHz ARM Cortex microcontroller with 32 kB FW memory, 8 kB RAM
  • 4 kB NVM for configuration
  • 32 MHz PWM timer
  • 10-bit 8-channel A/D converter
  • I2 C interface
  • Precise voltage and current measurements for FOD function
  • Thermal protection
  • Flip Chip 52 bumps (3.97x2.67 mm)

Key Components

  • Transmitter: STWBC-EP.
  • Receiver: STWLC33
  • Coils: customer Design (AVNET Support)

Target Applications
  • Cell phones and smartphones
  • Tablets and phablets
  • Charging accessories 


STMicroelectronics middle power charging solutions