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Wireless chargers are expected to become ubiquitous in hotels, airports, cafes and other public places as they enable to top up the batteries of portable and wearable devices, letting the user forget about cables.

In a wireless battery charging system, power is transferred by electromagnetic induction (inductive power transfer) between a transmitting pad - or dongle (TX) - and the battery-powered device (RX), such as a smartphone, smartwatch or sports gear. The power transmitter unit controls the current in the transmitting coil to transfer the correct amount of power as required by the receiver unit that continuously provides this information to the transmitter by modulating the transmitter carrier frequency through controlled resistive or capacitive load insertion. Generating the correct amount of power guarantees the highest level of end-to-end energy efficiency and helps limit the device's operating temperature.

We have a range of wireless battery charging solutions including transmitters and receivers providing low stand-by power and features like foreign objects detection (FOD). ST also offers evaluation and development tools and reference designs to help develop high-efficiency and compact wireless chargers compliant with the most common wireless charging standards including Qi and AirFuel.

Part Number
Description
STEVAL-ISB047V1 Qi certified 3-coil 15 W wireless charger TX evaluation kit based on STWBC-MC Quick view

Key Features

  • STWBC-MC digital controller
  • MP-A15 3-coil array
  • 15 W potential power
  • Flexible input voltage: 5 to 20 V from USB-C or DC jack
  • 5 W mode when connected to 5 V USB input or DC jack
  • Fixed frequency operation
  • WPC Qi1.2.4 standard certified
  • Robust demodulation algorithm, with triple path (V, I, f)
  • Foreign object detection (FOD)
  • Active presence detection
  • UART protocol to control and monitor the system
  • Complete reference design (evaluation board, schematics, PCB layout, firmware and tools)
  • 2-layer PCB
  • Low standby power consumption
  • Flash memory based
  • CE certified
  • RoHS compliant
  • WEEE compliant

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STEVAL-ISB044V1 Qi MP-A10 15 W wireless charger TX evaluation kit based on STWBC-EP Quick view

Key Features

  • STWBC-EP digital controller
  • 15 W output power
  • Qi MP-A10 reference design
  • WPC Qi1.2.3 standard compliant
  • Robust demodulation algorithm, with triple path (V, I, f)
  • Foreign object detection (FOD)
  • Accurate power control
  • Active presence detection
  • UART protocol to control and monitor the system
  • Complete reference design (evaluation board, IC, firmware and tools)
  • 2-layer PCB for easy design
  • Flash memory-based
  • RoHS compliant

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STEVAL-ISB042V1 Dual mode wireless power evaluation board for Qi and Airfuel inductive receiver and Qi-based transmitter with STWLC33 Quick view

Key Features

  • STWLC33 evaluation board with Würth Elektronik dual mode coil (760308102207)
  • Qi 1.2 compliant, supporting extended power profile: up to 15 W/10 V maximum output power
  • Backward compatible with Qi baseline power profile: up to 5 W/5 V maximum output power
  • PMA-SR1 (AirFuel inductive) compliant: 5 W/5.6 V maximum output power
  • Transmitter function based on Qi protocol to charge wearable devices using the same Rx coil (up to 3 W power)
  • Total system efficiency up to 80%
  • Configurable GPIOs for status indication
  • I²C interface for communication with the host system
  • Foreign object detection (FOD)
  • Complete kit (IC, firmware)
  • RoHS compliant

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STEVAL-ISB027V1 Qi A11 wireless charger transmitter evaluation board based on STWBC Quick view

Key Features

  • STWBC digital controller
  • 5 W output power
  • Qi 1.1.2 A11 certified
  • Foreign object detection (FOD)
  • Resistive and capacitive modulation
  • Active presence detector
  • Turn-key & FW APIs
  • complete kit (IC, firmware, tools)
  • RoHS compliant

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STEVAL-ISB045V1 2.5 W wireless charger transmitter evaluation kit Quick view

Key Features

  • STWBC-WA digital controller
  • 2.5 W output power
  • Resistive and capacitive modulation
  • Foreign object detection (FOD)
  • Active presence detector
  • Turn-key and firmware APIs
  • Total reference design (IC, firmware, GUI and dongle)

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Part Number
STEVAL-ISB047V1

Qi certified 3-coil 15 W wireless charger TX evaluation kit based on STWBC-MC

Key Features

  • STWBC-MC digital controller
  • MP-A15 3-coil array
  • 15 W potential power
  • Flexible input voltage: 5 to 20 V from USB-C or DC jack
  • 5 W mode when connected to 5 V USB input or DC jack
  • Fixed frequency operation
  • WPC Qi1.2.4 standard certified
  • Robust demodulation algorithm, with triple path (V, I, f)
  • Foreign object detection (FOD)
  • Active presence detection
  • UART protocol to control and monitor the system
  • Complete reference design (evaluation board, schematics, PCB layout, firmware and tools)
  • 2-layer PCB
  • Low standby power consumption
  • Flash memory based
  • CE certified
  • RoHS compliant
  • WEEE compliant

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IMAGE

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISB044V1

Qi MP-A10 15 W wireless charger TX evaluation kit based on STWBC-EP

Key Features

  • STWBC-EP digital controller
  • 15 W output power
  • Qi MP-A10 reference design
  • WPC Qi1.2.3 standard compliant
  • Robust demodulation algorithm, with triple path (V, I, f)
  • Foreign object detection (FOD)
  • Accurate power control
  • Active presence detection
  • UART protocol to control and monitor the system
  • Complete reference design (evaluation board, IC, firmware and tools)
  • 2-layer PCB for easy design
  • Flash memory-based
  • RoHS compliant

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IMAGE

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISB042V1

Dual mode wireless power evaluation board for Qi and Airfuel inductive receiver and Qi-based transmitter with STWLC33

Key Features

  • STWLC33 evaluation board with Würth Elektronik dual mode coil (760308102207)
  • Qi 1.2 compliant, supporting extended power profile: up to 15 W/10 V maximum output power
  • Backward compatible with Qi baseline power profile: up to 5 W/5 V maximum output power
  • PMA-SR1 (AirFuel inductive) compliant: 5 W/5.6 V maximum output power
  • Transmitter function based on Qi protocol to charge wearable devices using the same Rx coil (up to 3 W power)
  • Total system efficiency up to 80%
  • Configurable GPIOs for status indication
  • I²C interface for communication with the host system
  • Foreign object detection (FOD)
  • Complete kit (IC, firmware)
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISB027V1

Qi A11 wireless charger transmitter evaluation board based on STWBC

Key Features

  • STWBC digital controller
  • 5 W output power
  • Qi 1.1.2 A11 certified
  • Foreign object detection (FOD)
  • Resistive and capacitive modulation
  • Active presence detector
  • Turn-key & FW APIs
  • complete kit (IC, firmware, tools)
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISB045V1

2.5 W wireless charger transmitter evaluation kit

Key Features

  • STWBC-WA digital controller
  • 2.5 W output power
  • Resistive and capacitive modulation
  • Foreign object detection (FOD)
  • Active presence detector
  • Turn-key and firmware APIs
  • Total reference design (IC, firmware, GUI and dongle)

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN4900
      How to tune STEVAL-ISB038V1 wireless charging evaluation kit for wearable applications
      4.0
      1.1 MB
      PDF
      AN4900

      How to tune STEVAL-ISB038V1 wireless charging evaluation kit for wearable applications

Publications and Collaterals

    • Description Version Size Action
      STWBC Wireless battery charger 09.2017
      1.15 MB
      PDF
      STWBC-EP Extended Wireless Power 12.2017
      817.57 KB
      PDF

      STWBC Wireless battery charger

      STWBC-EP Extended Wireless Power

Development Tools

    • Part Number

      Diode product finder application for Android and iOS

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

Embedded Software

    • Part Number

      Graphical user interface for the STEVAL-ISB042V1 evaluation board based on STWLC33

      Firmware for the STEVAL-ISB044V1 wireless power transmitter evaluation board based on STBWC-EP

      Firmware for the STEVAL-ISB045V1 wireless charger transmitter evaluation kit based on STWBC-WA

      STWBC firmware downloader tool

      Graphical user interface for wireless power transmitter evaluation boards based on the STWBC chip family

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

Power Management

Part number Description
STWBC Digital controller for wireless battery charger transmitters supporting Qi A11 topology
STWBC-WA Digital controller for wireless battery charger transmitters for wearable and smart watches applications
Part number
Digital controller for wireless battery charger transmitters supporting Qi A11 topology
Digital controller for wireless battery charger transmitters for wearable and smart watches applications