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Texas Instruments BQ51221YFPT
- Part No.:
- BQ51221YFPT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 42-XFBGA, DSBGA
- Datasheet:
-
BQ51221YFPT.pdf
- Description:
- IC WIRELESS PWR RCVR 42DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:113
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Product details
Overview
BQ51221YFPT from Texas Instruments is a dual-mode (WPC v1.1 and PMA) wireless power receiver IC integrating synchronous rectification, post-regulation, digital communication control, and autonomous protocol detection in a single 42-pin YFP package. It delivers up to 1.5 A output current, supports adjustable 4.5–8 V output voltage, achieves 79% system efficiency at 5 W, and enables compact inductorless receiver designs for mobile devices.
For engineers reviewing the BQ51221YFPT datasheet, BQ51221YFPT pinout, BQ51221YFPT application, or BQ51221YFPT equivalent, key selection considerations include dual-standard compliance, I²C programmability of VO_REG and RXID, thermal shutdown at 155°C, dynamic rectifier control for transient response, and integrated clamp/COMM drivers for WPC/PMA load modulation.
Technical Context
The BQ51221YFPT implements fully autonomous dual-protocol operation: WPC v1.1 uses differential bi-phase encoded 2-kb/s packets via COMM1/COMM2 for authentication and error feedback, while PMA relies on continuous symbol-based signaling (INC/DEC/EOC) and transmits a factory-programmed 6-byte RXID. Its Dynamic Rectifier Control algorithm adjusts VRECT regulation thresholds (VOUT + 0.12 V to VOUT + 2 V) based on IOUT percentage and RILIM setting to optimize LDO dissipation and transient headroom.
Internal architecture integrates a fully synchronous rectifier with BOOT1/BOOT2 gate drivers, a 97%-efficient post-regulator LDO, adaptive clamp FETs (CLAMP1/CLAMP2), and analog sensing paths for TS/CTRL thermal monitoring, ILIM hardware current limiting (programmable via RILIM), and FOD scaling. All digital control, packet generation, and state management are handled autonomously without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Wireless Standards | Compliant with WPC v1.1 and PMA specifications - enables interoperability with both Qi-certified and Power Matters Alliance charging pads without firmware changes. |
| Output Current | 1.5 A maximum - supports fast-charging loads including smartphone baseband processors and USB-PD companion chargers. |
| System Efficiency | 79% at 5 W - achieved via inductorless design, 96% synchronous rectifier, and 97% post-regulator LDO, reducing thermal load in thin form factors. |
| Output Voltage Range | 4.5 V to 8 V - set by external resistor divider on VO_REG pin, enabling direct interface to Li-ion battery chargers or PMIC inputs. |
| Junction Temp Limit | 155°C with 20°C hysteresis - thermal shutdown protects against coil misalignment or foreign object heating during extended charging. |
| I²C Interface | 100 kHz standard-mode - used to read RXID, configure VO_REG code (0–7), and monitor device status registers without interrupting power transfer. |
| Package | YFP (42-pin), 3.586 mm × 2.874 mm - ultra-compact wafer-level chip-scale package optimized for space-constrained mobile PCB layouts. |
Pinout & Package
Package: YFP (42-pin wafer-level chip-scale package), body size 3.586 mm × 2.874 mm, exposed thermal pad on bottom.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1, AC2 | AC input | Dual resonant tank inputs - accept unrectified RF from secondary coil; support differential or single-ended configurations. |
| RECT | Rectifier output | Filtered DC node feeding internal LDO - voltage regulated between VOUT + 0.12 V and VOUT + 2 V depending on load and RILIM setting. |
| OUT | Regulated output | Final 4.5–8 V power rail - delivers up to 1.5 A with ±1.3% VO_REG feedback accuracy (0.495–0.5075 V reference). |
| COMM1, COMM2 | WPC/PMA communication | Open-drain FETs modulating reflected impedance - enable bidirectional packet exchange (WPC) or continuous symbol transmission (PMA). |
| CLAMP1, CLAMP2 | Voltage clamping | Low-RDS(on) (0.5 Ω) FETs - short secondary winding during overvoltage or fault conditions to protect downstream circuitry. |
| TS/CTRL | Thermal sense / EOC signal | Analog input for NTC thermistor or digital pull-high to trigger end-of-charge signaling to transmitter. |
| SCL, SDA | I²C interface | Standard 100 kHz bus - used for RXID readback, VO_REG configuration, and real-time status monitoring during active power transfer. |
| ILIM, RILIM | Hardware current limit | Analog programming pin with external resistor - sets short-circuit threshold (215–230 Ω = latch-off fault) and dynamic current scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Standard Autodetection | Zero-host-intervention protocol identification - detects WPC or PMA transmitter on power-up and configures communication engine accordingly. |
| Dynamic Rectifier Control | Adaptive VRECT regulation window (VOUT + 0.12 V to VOUT + 2 V) - maintains LDO headroom during load transients while minimizing conduction loss at steady state. |
| Patented Pad Detect (PD_DET) | Open-drain output asserted when receiver is placed on active transmitter - enables system-level presence detection without polling. |
| Inductorless Receiver Architecture | No external inductor required - reduces solution height and BOM count, enabling integration into <7-mm-thick smartphones and wearables. |
| Factory-Programmed RXID | Unique 6-byte IEEE-sanctioned identifier stored in one-time-programmable memory - ensures PMA-compliant authentication without host MCU involvement. |
Applications
| Smartphone Wireless Charging | Tablet Power Bank Integration |
|---|---|
Use Scenario: Embedded receiver in slim-profile smartphone chassis with metal backplate and tight antenna clearance. IC Role / Device Role / Timing Role: Dual-mode wireless power receiver managing rectification, regulation, thermal safety, and WPC/PMA handshaking autonomously. Use Value: Enables single-board compatibility with global Qi and PMA public charging infrastructure while maintaining <7-mm Z-height. |
Use Scenario: Portable power bank with built-in wireless charging pad and bidirectional power path. IC Role / Device Role / Timing Role: Receiver-side power manager delivering regulated 5 V/1.5 A to internal Li-ion charger IC with real-time thermal monitoring. Use Value: Eliminates need for discrete rectifier + LDO + communication controller, reducing footprint by >40% versus discrete solutions. |
| Wi-Fi Hotspot Power Management | Wireless Headset Charging Case |
Use Scenario: Always-on portable hotspot requiring low-quiescent-current wireless charging during standby. IC Role / Device Role / Timing Role: Ultra-low-power receiver with 20–35 µA quiescent current when wireless power disabled and intelligent wake-up via PD_DET. Use Value: Extends battery life during idle periods while enabling seamless recharge when placed on any WPC/PMA pad. |
Use Scenario: Compact charging case for true wireless stereo (TWS) earbuds with space-limited PCB area. IC Role / Device Role / Timing Role: Miniaturized receiver providing 4.5–5.5 V output to linear charger IC with integrated TS/CTRL thermal cutoff. Use Value: Achieves full 5-W capability in <120 mm² footprint using YFP package and inductorless topology. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ51021YFPT | WPC v1.1 only; no PMA support; identical YFP-42 package and VO_REG range. | Lacks dual-standard interoperability - suitable only for Qi-only ecosystems. | Select when PMA compatibility is unnecessary and cost reduction is prioritized over multi-standard flexibility. |
| BQ51222YFPT | Pin-compatible upgrade with enhanced thermal performance (RθJA = 42.3°C/W vs. 49.7°C/W) and extended 135°C TJ(max). | Supports higher ambient environments (e.g., automotive cabin, enclosed hotspots) without derating. | Choose for new designs requiring improved thermal margin or longer lifetime in high-temperature deployments. |
Compared with BQ51221YFPT, BQ51021YFPT sacrifices PMA compatibility for lower cost in Qi-only systems, while BQ51222YFPT retains full dual-mode functionality with superior thermal resistance - making it ideal for thermally constrained or high-reliability applications where junction temperature must remain below 125°C under sustained 5-W load.
Availability
BQ51221YFPT is available at Aetrix Electronics and suitable for smartphone wireless charging, tablet power bank integration, and Wi-Fi hotspot power management requiring stable component supply across production ramps and long lifecycle programs.
Supply support for BQ51221YFPT 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and wireless technologies, with leadership in power management and connectivity solutions.
The BQ51221YFPT belongs to TI's wireless power receiver product line, designed specifically to enable compact, standards-compliant, and thermally efficient wireless charging in consumer mobile devices - eliminating the need for discrete rectifiers, regulators, and communication controllers.
FAQ
What wireless charging standards does the BQ51221YFPT support?
The BQ51221YFPT supports both WPC v1.1 and PMA standards natively. It performs autonomous protocol detection at startup and configures its communication engine accordingly - no host MCU firmware changes are needed to switch between Qi-certified and Power Matters Alliance transmitters. This dual-mode capability is hard-coded in silicon and verified per SLUSBS9A datasheet Section 1.
How is output voltage programmed on the BQ51221YFPT?
Output voltage on the BQ51221YFPT is set via an external resistor divider from OUT to VO_REG pin, targeting 0.5 V at VO_REG (typical tolerance ±1.3%). The default I²C register 0x01 (B0–B2 bits) provides eight coarse steps (0–7), each corresponding to a 0.1-V increment in VO_REG reference. For example, code '3' yields ~0.5013 V at VO_REG, resulting in ~5.0 V output with standard R6/R7 values per Figure 8 in SLUSBS9A.
Does the BQ51221YFPT require an external inductor?
No, the BQ51221YFPT implements an inductorless receiver architecture. It uses internal synchronous rectification and filtering on the RECT pin, eliminating the need for an external series inductor typically found in legacy wireless receivers. This reduces solution height, BOM count, and PCB area - critical for smartphones and wearables. The datasheet explicitly states "Inductorless Receiver for Lowest Height Profile" in Feature Section 1.
What is the function of the PD_DET pin on the BQ51221YFPT?
The PD_DET (Pad Detect) pin on the BQ51221YFPT is an open-drain output that asserts low when the device detects placement on an active WPC or PMA transmitter. It provides system-level presence indication without requiring I²C polling or analog sensing. This signal can directly drive an LED, wake a host MCU, or enable power sequencing - simplifying system integration and reducing standby power consumption.
How does thermal protection work in the BQ51221YFPT?
The BQ51221YFPT features integrated thermal protection with shutdown at TJ = 155°C and 20°C hysteresis (TJ(OFF-HYS)). Temperature is monitored via the TS/CTRL pin, which accepts an NTC thermistor or can be pulled high to signal end-of-charge. When thermal shutdown activates, all power stages disable and the device remains latched off until junction temperature falls below 135°C. This behavior is specified in Electrical Characteristics Table 8.5 under THERMAL PROTECTION.
BQ51221YFPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 42-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Wireless Power Receiver
- Current - Supply:
- 20µA
- Voltage - Supply:
- 4V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 42-DSBGA
BQ51221YFPT FAQ
1.How can I place an order for BQ51221YFPT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51221YFPT 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 BQ51221YFPT reliable?
The price and inventory of BQ51221YFPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51221YFPT is usually 5 days.
3.What payment methods are accepted for BQ51221YFPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51221YFPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51221YFPT?
BQ51221YFPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51221YFPT 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 BQ51221YFPT?
For technical support, including BQ51221YFPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51221YFPT requirements.
6.How does Aetrix verify that BQ51221YFPT is sourced from the original manufacturer or authorized distributors?
All BQ51221YFPT 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 BQ51221YFPT meets industry standards.
7.What is the process for return or replacement of BQ51221YFPT?
All BQ51221YFPT units undergo pre-shipment inspection (PSI). If there is an issue with BQ51221YFPT, 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 BQ51221YFPT part is unused and in its original packaging.
Return procedure for BQ51221YFPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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