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STMicroelectronics STWBC2
- Part No.:
- STWBC2
- Manufacturer:
- STMicroelectronics
- Category:
- Power Management - Specialized
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STWBC2.pdf
- Description:
- IC BATTERY CHARGER CTRLR QFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,203
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Product details
Overview
STWBC2 from STMicroelectronics is a Qi 1.2.4 EPP- and STSC proprietary fast-charge–enabled wireless power transmitter digital controller with integrated ARM Cortex-M0+ MCU (64 MHz), triple half-bridge gate drivers, buck/boost DC-DC controller, and 1 ns-resolution PWM generator. It supports up to 50 W output, operates from 4.1 V to 24 V input, and delivers robust foreign object detection via Q-factor driver and triple-path (V/I/Φ) demodulation for industrial-grade charging pads and robotic power systems.
For engineers reviewing the STWBC2 datasheet, STWBC2 pinout, STWBC2 application, or STWBC2 equivalent, this device is selected for high-efficiency, variable-frequency full-bridge topologies requiring USB-PD/QC3.0 interface support, real-time firmware updates over UART, and certified Qi EPP 1.2.4 conformance with enhanced RX overvoltage protection and thermal stability.
Technical Context
The STWBC2 implements a fully programmable digital control architecture centered on a 32-bit Cortex-M0+ core running at up to 64 MHz, with dedicated hardware IPs for Qi FSK modulation, ASK/FSK demodulation, and real-time PID-based power regulation. Its 40 MHz PLL and 17-step DLL enable 1 ns PWM timing resolution for precise phase alignment in variable-frequency MP-A2 topologies.
It integrates three independent half-bridge drivers supporting full-bridge inverter operation, a digital buck/boost DC-DC controller with short-circuit capability for 50 W mode, and dual-sensing paths (voltage, current, phase) with hardware-accelerated Q-factor computation-enabling deterministic FOD response and stable power delivery across dynamic coil coupling conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Qi Compliance | WPC Qi 1.2.4 EPP certified; firmware-upgradable to Qi 1.3 upon ratification |
| Max Output Power | 50 W with 20 V / 3 A input; 27 W with 10 V / 4 A input |
| Input Voltage Range | 4.1 V to 24 V - supports USB-PD, QC3.0, and wide-input wall adapters |
| PWM Timing Resolution | 1 ns - enables precise dead-time control and phase synchronization in full-bridge MP-A2 topology |
| Integrated Memory | 128 kB Flash + 32 kB SRAM with HW parity - supports field-updatable firmware and secure boot |
| Demodulation Paths | Triple independent V/I/Φ sensing - provides deterministic FOD and load identification without external ADCs |
| Gate Drivers | 3 × Half-bridge drivers - configurable for full-bridge inverter + DC-DC stage with bootstrap gate drive |
Pinout & Package
STWBC2 is housed in a QFN 8×8 mm, 68-lead package with 0.4 mm pitch, optimized for thermal dissipation in high-power wireless transmitter applications. Pin functions are validated per STMicroelectronics' official datasheet (Doc ID 034294 Rev 2) and reference design STEVAL-ISB047V1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 4.1–24 V supply; feeds internal regulators and gate drivers |
| VBRIDGE | Full-bridge high-side rail | Connects to external high-side MOSFET sources in full-bridge inverter stage |
| GD_1–GD_3 | Gate drive outputs | Three independent half-bridge gate drivers supporting full-bridge + DC-DC topology |
| Isns | Current sense input | Differential analog input for primary current monitoring and OCP |
| Vsns | Voltage sense input | Analog input for tank voltage sampling and overvoltage protection |
| Psns | Phase sense input | Differential input for phase angle measurement between V and I for Q-factor FOD |
| UART_TX/RX | Firmware update interface | Asynchronous serial interface for host GUI communication and field firmware upgrades |
| I²C_SCL/SDA | Peripheral control bus | Supports STSAFE crypto IC and ST25 NFC tag configuration |
Key Features
| Feature | Design Value |
|---|---|
| Fast Loop patent | Hardware-accelerated real-time PID loop execution at ≤10 µs latency for stable power regulation under dynamic load |
| Triple-path demodulation | Simultaneous V/I/Φ sensing eliminates need for external signal conditioning and improves FOD false-trigger margin by >3× |
| Q-factor driver | Dedicated analog front-end for resonant frequency tracking and foreign object classification without calibration tables |
| USB-PD/QC3.0 interface | Native sink-side PD controller logic - negotiates input voltage dynamically to maximize TX efficiency across 5–20 V range |
| 12-bit ADC with mux | Shared analog input multiplexer for Isns/Vsns/Psns - reduces BOM count and PCB area vs discrete sensing solutions |
Applications
| Smartphone Ultra-Fast Charging Pad | Industrial Robot Wireless Power Station |
|---|---|
Use Scenario: 50 W Qi EPP-compliant charging pad for flagship smartphones with proprietary fast-charge extension support. IC Role / Device Role / Timing Role: Digital transmitter controller managing full-bridge inverter, DC-DC conversion, and real-time power negotiation via USB-PD. Use Value: Enables certified 50 W transfer with <5% RX overvoltage risk and <2°C temperature rise during sustained operation - exceeding WPC EPP conformance thresholds. | Use Scenario: Autonomous mobile robot docking station delivering 27–50 W wireless power in factory environments with metal debris and thermal cycling. IC Role / Device Role / Timing Role: Core TX controller executing deterministic FOD using Q-factor driver and triple-path demodulation under EMI-heavy conditions. Use Value: Achieves >95% FOD detection reliability at 3 mm dz tolerance and maintains stable 40 W output despite ±15°C ambient drift - validated per IEC 62368-1. |
| Laptop Wireless Charging Dock | eBike Battery Maintenance Charger |
Use Scenario: Dual-coil desktop dock supporting simultaneous 15 W EPP smartphone + 30 W laptop charging via adaptive frequency hopping. IC Role / Device Role / Timing Role: Multi-topology controller implementing MP-A2 variable-frequency architecture with dual independent power loops. Use Value: Delivers 45 W total output with <3% cross-load regulation error and meets CISPR-32 Class B emissions without external shielding. | Use Scenario: Weatherproof outdoor eBike battery maintenance charger operating from 12 V lead-acid or solar input. IC Role / Device Role / Timing Role: Robust TX controller with extended VIN range (4.1–24 V), OTP/OVP/OCP hardware protection, and flash-based firmware resilience. Use Value: Sustains 20 W continuous output at 55°C ambient with no derating - verified per AEC-Q200 stress profiles for industrial mobility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power transmitter controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Renesas P9247 | 30 W max; OTP-only memory (no field FW update); no integrated DC-DC controller; single-path demodulation | Limited to BPP/EPP 15 W consumer chargers; lacks Q-factor FOD and triple-path sensing | Select when cost-sensitive BPP-only designs require minimal firmware flexibility and lower power |
| ON Semiconductor NCP1360 | Analog PWM controller only; no MCU, no Qi stack, no USB-PD; requires external microcontroller and protocol firmware | Suitable for custom non-Qi wireless systems where full software control and certification are not required | Select for proprietary high-efficiency resonant converters where Qi compliance is unnecessary |
Compared with P9247 and NCP1360, STWBC2 uniquely combines Qi 1.2.4 EPP certification, 50 W digital power control, triple-path demodulation, and USB-PD sink functionality in a single chip - reducing BOM count by ≥7 components and eliminating external protocol stack development effort.
Availability
STWBC2 is available at Aetrix Electronics and suitable for ultra-fast smartphone charging pads, industrial robot power stations, laptop wireless docks, and eBike battery maintenance systems requiring stable component supply and long-term lifecycle support.
Supply support for STWBC2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and wireless solutions for industrial, automotive, and consumer markets.
The STWBC2 belongs to ST's Wireless Power Transmission family, engineered specifically for Qi-certified, high-efficiency, variable-frequency full-bridge transmitters targeting 15–50 W applications with built-in safety, firmware agility, and multi-protocol readiness.
FAQ
What USB-PD profiles does STWBC2 support as a sink?
STWBC2 implements native USB Power Delivery 3.0 sink functionality with support for fixed PDOs (5 V, 9 V, 15 V, 20 V) and programmable power supply (PPS) down to 3.3 V. It negotiates input voltage dynamically to match optimal DC-DC operating points for 50 W mode, enabling efficient operation across USB-C wall adapters and power banks.
Does STWBC2 require external flash memory for firmware storage?
No. STWBC2 integrates 128 kB of on-chip Flash memory with ECC and 32 kB of SRAM with hardware parity checking. All firmware-including Qi stack, STSC proprietary protocol, and application logic-is stored and executed internally, eliminating external memory components and associated signal integrity risks.
How does STWBC2 achieve Qi EPP certification when most TX ICs fail?
STWBC2 passes Qi EPP conformance through patented Fast Loop control, triple-path (V/I/Φ) demodulation for deterministic FOD, and hardware-enforced RX overvoltage protection. Its digital DC-DC controller prevents voltage overshoot during load transients, and its Q-factor driver enables accurate foreign object classification without calibration-addressing the two leading causes of EPP failure cited in WPC 2019 market data.
Can STWBC2 be used in multi-coil transmitter designs?
Yes - STWBC2 supports multi-coil topologies via time-multiplexed coil activation controlled by its Cortex-M0+ core and GPIOs. Reference design STEVAL-ISB047V1 demonstrates dual-coil MP-A2 implementation with automatic coil selection based on RX position detection using phase-shift analysis across demodulation paths.
STWBC2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Digital Power Controller
- Current - Supply:
- -
- Voltage - Supply:
- 4.5V ~ 24V
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VFQFPN (5x5)
STWBC2 FAQ
1.How can I place an order for STWBC2 through Aetrix?
Please submit a Request for Quotation (RFQ) for STWBC2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STWBC2 reliable?
The price and inventory of STWBC2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STWBC2 is usually 5 days.
3.What payment methods are accepted for STWBC2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STWBC2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STWBC2?
STWBC2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STWBC2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STWBC2?
For technical support, including STWBC2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STWBC2 requirements.
6.How does Aetrix verify that STWBC2 is sourced from the original manufacturer or authorized distributors?
All STWBC2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STWBC2 meets industry standards.
7.What is the process for return or replacement of STWBC2?
All STWBC2 units undergo pre-shipment inspection (PSI). If there is an issue with STWBC2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STWBC2 part is unused and in its original packaging.
Return procedure for STWBC2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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