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The STWBC is the digital controller for wireless battery charger (WBC) transmitters (TX) from STMicroelectronics, offering the most flexible and efficient solution for controlling power transfer to a receiver (RX) in WBC-enabled applications such as phones, wearables, and other battery powered devices that use electromagnetic induction for recharging.
As a member of the Qi Wireless Power Consortium and the PMA (Power Matters Alliance), ST ensures full compatibility with these leading wireless charging protocols and holds certification for the Qi 1.1.2 A11 standard.
The STWBC performs all the functions for transmitter control: thanks to the internal 96 MHz clock and supporting both half-bridge and full bridge topologies, it is able to precisely control the amount of transmitted power to match the requirements of the receiving unit in terms of maximizing the efficiency of the power transfer.
The STWBC comes with firmware options to offer customers the ability to personalize their end product without the need of external microcontrollers:
A turnkey Qi 1.1.2 A11 certified solution, fully interoperable with Qi enabled mobile phones.
API (application programming interface) access to customize the underlying firmware, for example modifying the behavior of the LEDs or GPIOs in response to the receiver behavior and supporting I²C and UART communication within a network.
The STWBC Qi 1.1.2 A11 certified solution is available in the STMicroelectronics STEVAL-ISB027V1 reference design, intended for all Qi compatible receivers such as in Qi enabled mobile phones.
In the reference design the STWBC integrates the foreign object detection (FOD): the digital feedback between TX and RX units allows the detection of metal objects close to the receiver that could result in potential hazards, enabling the STWBC to stop power transmission when such objects are detected.
The reference design is offered together with a complete ecosystem to support customers in building their applications, including the Qi 1.1.2 A11 certified board (STEVAL-ISB027V1), API libraries and documentation to develop software customizations, as well as a comprehensive graphical user interface to monitor real-time performance and diagnostics.Key Features
- Digital controller for wireless battery charger transmitter
- Multiple Qi certified and PMA standard compatible
- Support for up to 5 W applications
- Mobile
- Wearable, sports gear, medical
- Remote controllers
- Native support to half-bridge and full bridge topologies
- 5 V supply voltage
- 2 firmware options
- Turnkey solution for quick design
- APIs available for application customization1
- Peripherals available via APIs
- ADC with 10 bit precision and 1 MΩ input impedance
- UART
- I2C master fast/slow speed rate
- GPIOs
- Memory
- Flash and E2PROM with read-while-write (RWW) and error correction code (ECC)
- Program memory: 32 KBytes Flash; data retention 15 years at 85 °C after 10 kcycles at 25 °C
- Data memory: 1 KByte true data E2PROM; data retention:15 years at 85 °C after 100 kcycles at 85 °C
- RAM: 6 KBytes
- Reference design features
- 2 layers PCBs
- Active object detection
- Graphical user interface for application monitoring
- Evaluation boards
- Operating temperature: -40 °C up to 105 °C
- Package: VFQFPN32
Sample & Buy
| Part Number | Marketing Status | Package | Grade | ECCN (US) | Country of Origin | Temperature (°C) | Output Power (W) (typ) | More info | Approximate Price (US$)* / Qty | Order from ST | Order from Distributors | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| STWBC | Active | VFQFPN 32 5x5x1.0 | Industrial | 3A991A2 | PHILIPPINES | -40 | 105 | 5 | 2.6875 / 1k | Get sample | Check Availability | |
| STWBCTR | Active | VFQFPN 32 5x5x1.0 | Industrial | 3A991A2 | PHILIPPINES | -40 | 105 | 5 | 5.58 / 1k | Check Availability | ||
STWBCTR
Marketing Status
ActivePackage
VFQFPN 32 5x5x1.0Approximate Price (US$)* / Qty
5.58 / 1k(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
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Development Tools
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Picture Part number Manufacturer Description 
ST-LINK/V2 ST ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 Part NumberST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32
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Picture Part number Manufacturer Description IAR Embedded Workbench for STM8 IAR Systems Integrated Development Environment. IAR Embedded Workbench for STM8 - Functional Safety IAR Systems Integrated Development Environment Part NumberIntegrated Development Environment.
Integrated Development Environment
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Embedded Software
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Picture Part number Manufacturer Description 
STSW-ISB027FW ST Firmware for STEVAL-ISB027V1 QiA11 wireless power transmitter evaluation board based on STBWC 
STSW-STWBCFWDT ST STWBC firmware downloader tool 
STSW-STWBCGUI ST Graphical user interface for wireless power transmitter evaluation boards based on the STWBC chip family Part NumberFirmware for STEVAL-ISB027V1 QiA11 wireless power transmitter evaluation board based on STBWC
STWBC firmware downloader tool
Graphical user interface for wireless power transmitter evaluation boards based on the STWBC chip family
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Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISB027V1 ST Qi A11 wireless charger transmitter evaluation board based on STWBC Part NumberQi A11 wireless charger transmitter evaluation board based on STWBC
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| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| STWBC | Active | VFQFPN 32 5x5x1.0 | Industrial | Ecopack2 | |
| STWBCTR | Active | VFQFPN 32 5x5x1.0 | Industrial | Ecopack2 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
