ST Enables The Wireless Charging World

Wearable

Consumer

Automotive

Wearable Solution

5 V USB powered TX and configurable output voltage 5 V or direct charging mode on RX

Active presence detection, FOD, Li-Ion battery supported

Firmware customization available

Wireless charging reference design – 1 Watt wireless delivery

• Li-Ion direct charging supported• Support for 5 V regulated voltage• Space saving solution with optimized BOM• Up to 3 mm Z

Wearable SolutionWireless charging reference design – 1 Watt wireless delivery

Transmitter STWBC-WA Receiver: STWLC04

1 cm2 cm• 5 V USB powered• Active presence detection• Stand-by FOD• Firmware customization with API

STWLC04 High-performance receiver for wearable applications

• Coil Rx – TDK WR111118-36F5-B1 • Max. Z @ 1 W: 3 mm

Embedded MCU with 16Kb ROM and 2Kb RAM

Programmable buck converter with current and voltage regulation. FSW=800 MHz

Flip Chip 3.1x4.7mm2

2Kb NVM memory for customization

Integrated high efficiency synchronous rectifier

43% total system efficiency with small coils

Fixed output voltage or direct battery charging functionality

Wearable Solution

Configurable via API for application customizationvia graphical interface for easier analysis

STWBC-WA: transmitter for wearable

Run Time Analysis GUI

Smart standbyAutomatic receiver recognition

foreign object detection for increased safety

Minimal BOM thanks to half bridge architecture

USB as power source5 V input, up to 0.5 A

Transmitter STWBC-WA

2 cm

Wearable Solution

STWBC-WA transmitter and STWLC04 receiver measurement results

0

0.05

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0.15

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0.25

0.3

0.35

0.4

0.45

0.5

50 70 90 110 130 150 170 190 210

eff[%

]

IOUT[mA]

Total system efficiency wearable kit 1W

VOUT=5V

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.00E+00 5.00E+06 1.00E+07 1.50E+07

Volta

ge [V

]

Cur

rent

[A]

Time [s]

Charging profile

IBAT Mean [A]IIN Mean [A]VBAT [V]

Wearable Solution

Consumer SolutionWireless charging reference design: plug and play

Plug and play solution certified with Qi and PMA standards

Energy friendly with smart standby, safe with FOD

Firmware customization available, supports different battery chemistry and direct charging

• Energy friendly: Integrated high-performance buck converter and synchronous rectifier

• Plug and play: certification with Qi (5 W) and PMA standards (7.5 W)• Safe: enables safe operation with advanced FOD• Flexible: supports different battery chemistry and direct charging

• Ubiquitous: 5 V USB powered• Plug and play: Qi 1.2 LP certified (5 W)• Smart Standby: 3 mW consumption with FOD• Flexible: customizable via GUI or software API

Consumer SolutionWireless charging reference design: plug and play

STWBC: Transmitter Receiver: STWLC03

STWLC03 - Receiver

Adapts the transmitted power to actual load conditions with digital feedback to transmitter

Safe operation with foreign object detection (FOD)

Configurable 32 bit core with I2C interface for run time analysis

Ideal for a wide application spectrum

• From low to medium power applications• Supports different battery chemistry: Li-ion and Li-pol• Allows direct battery charging

Boosts power transfer with integrated high-performance buck converter and synchronous rectifier

+

High-performance receiver up to 15 W supporting both Qi and PMA standards

STWBC - TransmitterFlexible, efficient, compliant with leading standard

Ideal for

Mobile phones, wearable devices, sports gear, medical equipment,

remote controllers

+

Compliant with 5 W class of wireless power Smart standby down to 3 mW

Digital feedback with foreign objects detection (FOD) active also in stand-by for additional safety

2 firmware options: turnkey solution for quick design, APIs (application programming interfaces) for customization

Qi 1.2 LP A11 certified

Automotive Solution

Qi-certified solutions with foreign-object detection

NFC coexistence

Transmitter: STWBC-MC and ASTWBC AEC-Q100 Grade 2

ESD protections, low EMI, smart standby

Multi-coil providing a large charging area

Wireless charging is part of the convergence of smartphones and vehicles

STWBC-MC transmitter controlling flyback, half Bridge, coil selectors, Qi protocol and FOD

Automotive SolutionWireless charging is part of the convergence of smartphones and vehicles

Power rate 5 W typical on RX side

Qi 1.2.1 certification ongoing

Wirelesscharging features

Wide charging area: 3 coils support

Low EMI: fixed frequency switching

Safe: foreign object detection also during stand-by

Dynamic voltage adaptation: support variable Vin from 5V to 15V

Solution features

2 layers PCB

Turn key or customization contacting ST

Products STWBC-MC and ASTWBC with AEC-Q100 grade 2 (- 40 ÷ 105 °C) qualification ongoing

Automotive Solution

More than Qi A13:• Battery operated +5 / +15 V• Single DC-DC conversion stage• Innovative half bridge• New Qi topology• Single controller for all power stages

Wireless charging is part of the convergence of smartphones and vehicles

• Digital controllers for in-vehicle wireless charging• STWBC-MC • ASTWBC with AEC-Q100 grade 2 (- 40 ÷ 105 °C)

qualification ongoing and QFN32 5x5 with wettableflank option

• Qi certification ongoing• Turnkey solution for quick design• Customization contacting ST:

• Program memory: 32* Kbyte EEPROM • ADC with 10 bit precision• UART• I2C master fast-slow speed rate• GPIOs

Automotive Solution

STWBC-MCASTWBC

Wireless charging is part of the convergence of smartphones and vehicles

* Available size for API depends on selected FW)

Customizable end-applications

Wireless PowerSystem know-how for complete solution with TX and RX

Load

Power Pick-upUnit

Secondary Coil

Communications & Control Unit

Sensing & Control

Mobile Device

System Unit

OutputPower

Power Conversion Unit

InputPower

Communications & Control Unit

Receiver

POW

ER

TX

TransmitterMagnetic Coupling

Primary Coil

RXD

IGIT

AL

CO

MM

UN

ICAT

ION

Digital feedback from RX to TX

Foreign object detection (FOD)

Multiple Qi and PMA standards supported

STWBC - TransmitterFlexible, efficient, compliant with leading standards

Ideal for

Mobile phones, wearable devices, sports gear, medical equipment,

remote controllers Compliant with 5 W class of wireless power Smart standby down to 3 mW

Digital feedback with foreign objects detection (FOD) active also in stand-by for additional safety

2 firmware options: turnkey solution for quick design, APIs (application programming interfaces) for customization

Qi 1.2 LP A11 certified

STWLC - ReceiverApplications up to 15 W, supporting Qi and PMA standards

Adapts the transmitted power to actual load conditions with digital feedback to transmitter

Safe operation with foreign object detection (FOD)

Embedded 32 bit core for customization and superior diagnostics

Boosts power transfer with integrated high-performance buck converter and synchronous rectifier

Ideal for

low to medium power applications, different chemistry Li-Ion and LiPo,

and direct charging

Further information and full design support available at: www.st.com

Wireless PowerAvailable now!