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Texas Instruments BQ51051BYFPR
- Part No.:
- BQ51051BYFPR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-XFBGA, DSBGA
- Datasheet:
-
BQ51051BYFPR.pdf
- Description:
- IC WIRELESS PWR RCVR 28DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,268
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Product details
Overview
BQ51051BYFPR from Texas Instruments is a Qi v1.2–compliant wireless power receiver IC integrating synchronous rectification, Li-ion battery charging control, and digital communication for WPC-compliant systems. It delivers 4.35-V regulated output, supports up to 1.5-A charge current, features 93% peak AC-DC efficiency, and operates with input rectified voltage from 4 V to 10 V - used in smartphones and portable media players requiring compact, standards-based wireless charging.
For engineers reviewing the BQ51051BYFPR datasheet, BQ51051BYFPR pinout, BQ51051BYFPR application, or BQ51051BYFPR equivalent, key selection criteria include its 4.35-V battery regulation, JEITA-compliant temperature monitoring via TS/CTRL, integrated FOD and communication modulation, and compatibility with TI's bq500212A transmitter controller in end-to-end Qi systems.
Technical Context
The BQ51051BYFPR implements a single-stage architecture combining AC-to-DC conversion and constant-current/constant-voltage battery charging in one die. Its digital controller executes Qi v1.2 packet-based communication over COMM1/COMM2, while internal synchronous rectifier FETs (100-mΩ typical RDS(on)) drive BOOT1/BOOT2 for high-efficiency power transfer.
It uses adaptive VRECT regulation - tracking VBAT + 300 mV during constant-current phase and switching to fixed 5.11-V regulation during constant-voltage phase - and integrates NTC-based thermal monitoring with programmable JEITA thresholds (0°C, 10°C, 45°C, 60°C) via the TS/CTRL pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulated Output Voltage | 4.35 V ±20 mV - precise Li-ion termination voltage enabling full capacity without overvoltage stress. |
| Max Charge Current | 1.5 A - set via ILIM resistor (KILIM = 314 A·Ω), supporting fast-charging smartphones and wearables. |
| Peak Efficiency | 93% - achieved using low-RDS(on) N-MOSFETs and adaptive VRECT tracking, minimizing thermal load in space-constrained designs. |
| Input Voltage Range | 4 V to 10 V at RECT - compatible with standard Qi receiver coil outputs and tolerant of transient overvoltage up to 15 V (OVP). |
| Communication Interface | Capacitive load modulation via COMM1/COMM2 - enables bidirectional Qi v1.2 packet exchange with transmitter for power control and fault reporting. |
| Thermal Monitoring | JEITA-compliant NTC sensing via TS/CTRL - supports four-point temperature profiling (0°C/10°C/45°C/60°C) with programmable hysteresis for safe charging across ambient conditions. |
| Package | VQFN-20 (4.5 mm × 3.5 mm, exposed thermal pad) - optimized for thermal dissipation and PCB area efficiency in slim mobile devices. |
Pinout & Package
The BQ51051BYFPR is housed in a 20-pin VQFN package (RHL) with an exposed thermal pad that must be soldered to PGND for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | AC Input Terminals | Connect directly to receiver coil; accept unrectified AC waveform - dual-input design improves coupling tolerance and EMI resilience. |
| RECT | Rectified Output Node | Filtered DC output of internal synchronous rectifier; supplies LDO and charger stage - requires 4.7–22 µF ceramic capacitor to PGND. |
| BAT | Battery Output | Delivers regulated charging current to Li-ion cell; includes short-circuit detection (0.8 V threshold) and precharge logic. |
| TS/CTRL | Temperature Sense & Control | Multi-function pin: connects to NTC for JEITA thermal profiling or pulled high/low to signal EPT (End Power Transfer) to transmitter. |
| ILIM | Charge Current Programming | Analog input setting IBULK via external resistor; supports 500–1500 mA range with ±3% accuracy over temperature. |
| COMM1 / COMM2 | Qi Communication Modulators | Open-drain outputs modulating reflected impedance - enable bidirectional data exchange (e.g., power request, fault status) per WPC v1.2 spec. |
| FOD | Foreign Object Detection Input | Analog input measuring rectified power level - used by internal algorithm to detect metallic interference and halt power transfer if unsafe. |
| BOOT1 / BOOT2 | Bootstrap Drivers | Drive gate of high-side rectifier FETs; require 10-nF ceramic capacitors to AC1/AC2 for self-biasing and reliable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Qi v1.2 Controller | Eliminates need for external MCU or protocol stack - handles packet framing, CRC, and handshake with transmitter autonomously. |
| Synchronous Rectifier + LDO | Single-stage power path reduces component count and losses - replaces discrete diode bridge and linear regulator with 100-mΩ MOSFETs and adaptive VRECT. |
| JEITA Temperature Compliance | Hardware-enforced 4-point thermal profile (0°C–60°C) with configurable thresholds - ensures safe charging across environmental extremes without firmware intervention. |
| Wired/Wireless Priority Logic | EN2 and AD/AD-EN pins enable seamless transition between wired adapter and wireless charging - prevents conflict and maintains system-level power continuity. |
| Robust Fault Protection | Includes input OVP (15 V), UVLO (2.7 V), thermal shutdown (155°C), BAT short-circuit detection, and ILIM short latch-off - reduces need for external protection circuitry. |
Applications
| Smartphones | Wireless Earbuds |
|---|---|
Use Scenario: Integrated into flagship smartphone mainboard for contactless charging via Qi-certified pads. IC Role / Device Role / Timing Role: Primary wireless power receiver and battery charger - manages full CC/CV profile, communicates power requests, and enforces JEITA thermal limits. Use Value: Enables 1.5-A fast charging with 93% efficiency and eliminates need for separate rectifier + charger ICs, saving 3.2 mm² PCB area. | Use Scenario: Embedded in compact earbud charging case to wirelessly recharge TWS earbuds. IC Role / Device Role / Timing Role: Standalone Qi receiver delivering regulated 4.35-V output to small-form-factor Li-ion cells - uses TS/CTRL for case-temperature monitoring. Use Value: Supports ultra-low quiescent current (20 µA standby) and small VQFN-20 footprint, critical for space- and power-constrained accessories. |
| Portable Media Players | Tablet Accessories |
Use Scenario: Used in ruggedized media player with sealed chassis where USB port access is limited. IC Role / Device Role / Timing Role: Sole power interface - receives energy via embedded coil, regulates to 4.35 V, and terminates charge at 100 mA (programmable via TERM pin). Use Value: Provides certified Qi interoperability and built-in FOD, eliminating risk of heating from misaligned metal objects during charging. | Use Scenario: Deployed in detachable keyboard folio with integrated Qi receiver for tablet battery top-up. IC Role / Device Role / Timing Role: Dual-role device - charges internal battery while simultaneously powering USB peripherals via BAT output. Use Value: Leverages EN2/AD-EN logic to prioritize wired power when available, ensuring uninterrupted accessory operation during mixed-power scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq51222YFPR | Higher integration: includes integrated coil driver, supports 5-W output, adds I2C configuration interface. | Requires firmware setup for custom profiles; not drop-in - needs layout and firmware updates. | Choose for next-gen designs needing programmable power levels and enhanced diagnostics. |
| MP-A21 | Standalone Qi v1.2 receiver only - no integrated battery charger; requires external charging IC. | Used in systems with existing charger ICs or multi-cell configurations beyond single Li-ion. | Choose when battery management is handled separately or when flexibility in charger selection is required. |
Compared with bq51222YFPR and MP-A21, the BQ51051BYFPR offers the most direct integration for single-cell Li-ion wireless charging - combining rectification, regulation, and JEITA-compliant charging in one VQFN-20 package without requiring external controllers or chargers.
Availability
BQ51051BYFPR is available at Aetrix Electronics and suitable for smartphones, wireless earbuds, and portable media players requiring stable component supply, full Qi v1.2 certification, and JEITA-compliant thermal safety.
Supply support for BQ51051BYFPR 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 BQ51051BYFPR belongs to TI's bq5105x wireless power receiver family, designed specifically for compact, high-efficiency, standards-compliant Li-ion battery charging in consumer portable electronics.
FAQ
What is the regulated battery output voltage of the BQ51051BYFPR?
The BQ51051BYFPR provides a factory-trimmed 4.35-V regulated output voltage with ±20-mV tolerance at 1-A load. This value is fixed per device variant and matches the nominal full-charge voltage of high-capacity Li-ion cells. The BQ51051BYFPR does not support user-adjustable VBAT - alternative variants like BQ51050B (4.20 V) and BQ51052B (4.40 V) are offered for different cell chemistries.
How does the BQ51051BYFPR implement foreign object detection (FOD)?
The BQ51051BYFPR performs FOD by continuously monitoring the rectified power level at the FOD pin using an internal ADC. It compares measured power against expected values derived from Qi v1.2 communication packets and triggers a fault if deviation exceeds 375 mW - halting power transfer and signaling EPT to the transmitter. No external comparator or microcontroller is required.
Can the BQ51051BYFPR operate without an NTC thermistor?
Yes, the BQ51051BYFPR can operate without an NTC thermistor. If temperature monitoring is not needed, connect the TS/CTRL pin to PGND through a 10-kΩ pull-down resistor. JEITA compliance is then disabled, and the device defaults to standard CC/CV charging. However, omitting NTC forfeits thermal fault protection and may violate safety certifications for consumer products.
What is the function of the EN2 pin on the BQ51051BYFPR?
The EN2 pin on the BQ51051BYFPR sets priority between wired and wireless power sources. When EN2 is pulled low and a valid voltage is present on the AD pin, the device disables wireless charging and activates AD-EN to enable an external PFET for wired charging. When EN2 is high, wireless charging remains active regardless of AD voltage - enabling flexible dual-input power architectures.
Does the BQ51051BYFPR support programmable charge termination current?
Yes, the BQ51051BYFPR supports programmable charge termination current via the TERM pin. A resistor from TERM to PGND sets termination as a percentage of the programmed bulk current (IBULK), using KTERM = 240 Ω/%. For example, with IBULK = 1000 mA and RTERM = 2.4 kΩ, termination occurs at 100 mA. This allows precise adaptation to battery capacity and aging characteristics.
BQ51051BYFPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Wireless Power Receiver
- Current - Supply:
- 8mA
- Voltage - Supply:
- 4V ~ 10V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-DSBGA
BQ51051BYFPR FAQ
1.How can I place an order for BQ51051BYFPR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51051BYFPR 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 BQ51051BYFPR reliable?
The price and inventory of BQ51051BYFPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51051BYFPR is usually 5 days.
3.What payment methods are accepted for BQ51051BYFPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51051BYFPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51051BYFPR?
BQ51051BYFPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51051BYFPR 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 BQ51051BYFPR?
For technical support, including BQ51051BYFPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51051BYFPR requirements.
6.How does Aetrix verify that BQ51051BYFPR is sourced from the original manufacturer or authorized distributors?
All BQ51051BYFPR 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 BQ51051BYFPR meets industry standards.
7.What is the process for return or replacement of BQ51051BYFPR?
All BQ51051BYFPR units undergo pre-shipment inspection (PSI). If there is an issue with BQ51051BYFPR, 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 BQ51051BYFPR part is unused and in its original packaging.
Return procedure for BQ51051BYFPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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