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Texas Instruments BQ51020YFPT
- Part No.:
- BQ51020YFPT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 42-XFBGA, DSBGA
- Datasheet:
-
BQ51020YFPT.pdf
- Description:
- IC WIRELESS PWR RCVR 42DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:522
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Product details
Overview
BQ51020YFPT from Texas Instruments is a WPC v1.1–compliant single-chip wireless power receiver IC for 5-W inductive charging systems. It integrates synchronous rectification, post-regulation LDO, digital communication, foreign object detection (FOD), and dynamic rectifier control - delivering up to 1.0 A output at adjustable 4.5–8 V into smartphones and power banks.
For engineers reviewing the BQ51020YFPT datasheet, BQ51020YFPT pinout, BQ51020YFPT application, or BQ51020YFPT equivalent, key selection criteria include its standalone operation (no I²C required), 42-pin DSBGA package (3.60 × 2.89 mm²), 79% system efficiency at 5 W, hardware current limit via ILIM pin, and integrated clamp/COMM drivers for WPC-compliant load modulation.
Technical Context
The BQ51020YFPT implements a fully autonomous WPC v1.1 receiver stack: it performs bi-phase encoded 2-kb/s communication via open-drain COMM1/COMM2 pins, executes dynamic rectifier control to maintain VRECT headroom across load transients, and regulates output using an internal LDO with VO_REG feedback setpoint of 0.5013 V (typ).
Its analog control architecture includes hardware-based overcurrent protection (ILIM pin threshold at 1.2 V), thermal shutdown at 155°C with 20°C hysteresis, undervoltage lockout at 2.9 V (typ), and input overvoltage protection at 15.1 V (typ) - all without firmware or external microcontroller dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Wireless Standard | WPC v1.1 compliant - enables interoperability with Qi-certified transmitters without protocol stack development |
| Max Output Current | 1.0 A - supports fast-charging loads such as USB-powered devices and Li-ion battery chargers |
| Output Voltage Range | 4.5 V to 8 V - adjustable via external resistor divider on VO_REG pin, enabling optimization for varied battery chemistries |
| System Efficiency | 79% at 5 W - achieved via fully synchronous rectifier (96% efficient) and 97% efficient post-regulator LDO |
| Package | DSBGA-42 (3.60 × 2.89 mm²) - ultra-low-profile solution for space-constrained mobile receivers |
| Thermal Resistance | RθJA = 49.7°C/W - validated on JEDEC high-K board, supporting continuous 1-A operation with standard PCB layout |
| Communication Interface | Standalone mode - no I²C required; uses dedicated COMM1/COMM2 pins for WPC packet transmission |
Pinout & Package
Package: 42-pin DSBGA (YFP), body size 3.60 × 2.89 mm², 0.4-mm pitch, bottom-side solder balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1, AC2 | AC input from resonant tank | Dual differential inputs for rectifier stage; support full-wave synchronous rectification from secondary coil |
| OUT | Regulated DC output | Delivers up to 1.0 A at 4.5–8 V to downstream charger IC; rated for 20-V absolute max |
| RECT | Rectified voltage node | Internal synchronous rectifier output; feeds LDO input; regulated to VOUT + 0.12 V (min) under full load |
| COMM1, COMM2 | WPC load modulation outputs | Open-drain FETs that switch CLAMP capacitors to modulate reflected impedance - essential for WPC packet transmission |
| ILIM | Hardware current limit programming | Analog input setting overcurrent threshold; 1.2 V at ILIM corresponds to IOUT limit (e.g., 1.0 A with RILIM = 842 Ω) |
| VO_REG | Output voltage feedback reference | Input pin for resistor divider; internal 0.5013-V reference sets VOUT = 0.5013 × (1 + R6/R7) |
| TS/CTRL | Temperature sense / EPT control | Pull-high to signal charge-complete (EPT); pull-low to signal overtemperature shutdown - direct interface to TX |
| PD_DET, WPG | Status outputs | Open-drain signals: PD_DET asserts when receiver is on TX pad; WPG asserts during active power transfer |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Rectifier Control | Adjusts VRECT target in real time (e.g., VOUT + 2.0 V at light load → VOUT + 0.12 V at full load) to maintain LDO headroom and improve transient response |
| Inductorless Receiver Architecture | Eliminates external inductor - reduces solution height and BOM count while maintaining 5-W capability |
| Patented Transmitter Pad Detect | Uses RF energy harvesting via TMEM pin to detect presence on TX pad before full power engagement - improves user experience and safety |
| Integrated Clamp Drivers (CLAMP1/CLAMP2) | Low-RDS(on) (0.5 Ω typ) FETs enable precise secondary voltage clamping - critical for FOD accuracy and coil protection |
| Adapter Enable (AD/AD-EN) | Hardware mux control allowing wired power to override wireless charging - supports dual-input power path without external logic |
Applications
| Smartphone Wireless Charging | Portable Power Bank |
|---|---|
Use Scenario: Integrated into slim smartphone chassis to replace wired charging port with Qi-compatible inductive interface. IC Role / Device Role / Timing Role: Primary power conversion and WPC protocol engine - handles rectification, regulation, communication, and safety monitoring autonomously. Use Value: Enables 5-W charging with <3.6-mm total solution height; eliminates need for discrete rectifier + MCU + transceiver combo. |
Use Scenario: Embedded in compact external battery packs to accept wireless input while delivering USB output. IC Role / Device Role / Timing Role: Standalone wireless receiver managing input power negotiation, FOD, and output regulation to internal boost converter. Use Value: Delivers 79% system efficiency at 5 W with no firmware development; supports alignment training via PD_DET/WPG status feedback. |
| Tablet Charging Dock | Wireless Headset Case |
Use Scenario: Mounted inside desktop dock housing to charge tablets placed on surface without alignment constraints. IC Role / Device Role / Timing Role: Full WPC v1.1 receiver - performs authentication, power negotiation, and dynamic rectifier control per WPC spec. Use Value: Achieves robust operation across ±5-mm misalignment using patented pad detect and alignment assist via I²C (bq51021 variant); BQ51020YFPT provides identical core functionality in standalone mode. |
Use Scenario: Embedded in compact earbud charging case to enable drop-and-charge operation without proprietary contacts. IC Role / Device Role / Timing Role: Low-quiescent-current (20 µA typ) wireless power manager - maintains readiness during standby and enables rapid wake-on-field-detection. Use Value: Supports >100-cycle battery life in case with 5-W input; thermal shutdown (155°C) and UVLO (2.9 V) ensure safe operation in sealed enclosure. |
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 | I²C interface enabled; EN1/EN2 pins used for SDA/SCL; supports register-level configuration and alignment training | Required where host MCU needs runtime control of VO_REG, FOD thresholds, or communication timing | Select bq51021YFPT if system requires programmable parameters; BQ51020YFPT is preferred for cost-sensitive, fixed-function designs |
| bq51221YFPT | Dual-mode (WPC v1.1 + PMA); additional MODE pin; higher integration for multi-standard compliance | Needed only in markets requiring PMA compatibility (e.g., legacy carrier deployments); adds complexity and cost | Choose bq51221YFPT only if PMA certification is mandatory; BQ51020YFPT offers optimal WPC-only performance and footprint |
Compared with bq51021YFPT and bq51221YFPT, BQ51020YFPT delivers identical WPC v1.1 core functionality with lowest BOM count and smallest footprint - ideal for volume consumer electronics where I²C control or multi-standard support is unnecessary.
Availability
BQ51020YFPT is available at Aetrix Electronics and suitable for smartphone charging, portable power bank design, and wireless headset case development requiring stable component supply and long-term lifecycle support.
Supply support for BQ51020YFPT 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 and embedded processing technologies, with leadership in power management and wireless charging solutions.
The bq5102x product line was designed specifically for compact, high-efficiency WPC v1.1 wireless power receivers - targeting consumer electronics where minimal height, autonomous operation, and system-level efficiency are critical.
FAQ
What is the primary function of the BQ51020YFPT in a wireless charging system?
The BQ51020YFPT serves as a complete WPC v1.1–compliant wireless power receiver IC. It performs AC-to-DC conversion via synchronous rectification, regulates output voltage using an internal LDO, executes bidirectional communication with the transmitter via COMM1/COMM2 pins, and implements safety features including foreign object detection and thermal shutdown - all within a single 42-pin DSBGA package. Its standalone architecture eliminates the need for external microcontrollers or protocol stacks.
Does the BQ51020YFPT require an external microcontroller to operate?
No, the BQ51020YFPT operates autonomously without any external microcontroller. It embeds the full WPC v1.1 communication stack, dynamic rectifier control algorithm, and analog regulation loops - enabling plug-and-play integration into wireless charging receivers. Unlike the bq51021YFPT variant, BQ51020YFPT uses EN1/EN2 as ground pins and relies solely on hardware-configured pins (ILIM, VO_REG, TS/CTRL) for setup.
How is output voltage programmed on the BQ51020YFPT?
Output voltage on the BQ51020YFPT is set by an external resistor divider connected between OUT and VO_REG pins. The internal reference is 0.5013 V (typ), so VOUT = 0.5013 × (1 + R6/R7). For example, to achieve 5.0 V output, select R6 = 90 kΩ and R7 = 10 kΩ. This analog programming method ensures deterministic behavior without firmware dependencies - a key differentiator from I²C-configurable variants like bq51021YFPT.
What is the role of the ILIM pin on the BQ51020YFPT?
The ILIM pin on the BQ51020YFPT provides hardware-based overcurrent protection by setting the maximum output current limit. When the voltage at ILIM reaches 1.2 V, the device latches off output current. The required resistance is calculated as RILIM = KILIM / IILIM, where KILIM = 842 A·Ω (typ). For a 1.0-A limit, RILIM = 842 Ω - typically implemented with R1 + RFOD. This analog current limiting operates independently of communication or software, enhancing system safety.
Can the BQ51020YFPT coexist with wired adapter power in the same device?
Yes, the BQ51020YFPT supports adapter enable functionality via AD and AD-EN pins. When adapter voltage exceeds 3.6 V (typ), the device disables wireless power transfer, asserts WPG low, and signals end-of-charge (EPT) to the transmitter. It then enables a back-to-back PMOS mux (external) between AD and OUT to route wired power. This allows seamless transition between wireless and wired input without external arbitration logic - a feature confirmed in the BQ51020YFPT datasheet Section 8.3.5.
BQ51020YFPT 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:
- 2.5A
- Voltage - Supply:
- 4V ~ 10V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 42-DSBGA
BQ51020YFPT FAQ
1.How can I place an order for BQ51020YFPT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51020YFPT 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 BQ51020YFPT reliable?
The price and inventory of BQ51020YFPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51020YFPT is usually 5 days.
3.What payment methods are accepted for BQ51020YFPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51020YFPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51020YFPT?
BQ51020YFPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51020YFPT 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 BQ51020YFPT?
For technical support, including BQ51020YFPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51020YFPT requirements.
6.How does Aetrix verify that BQ51020YFPT is sourced from the original manufacturer or authorized distributors?
All BQ51020YFPT 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 BQ51020YFPT meets industry standards.
7.What is the process for return or replacement of BQ51020YFPT?
All BQ51020YFPT units undergo pre-shipment inspection (PSI). If there is an issue with BQ51020YFPT, 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 BQ51020YFPT part is unused and in its original packaging.
Return procedure for BQ51020YFPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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