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Texas Instruments BQ51050BYFPT
- Part No.:
- BQ51050BYFPT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-XFBGA, DSBGA
- Datasheet:
-
BQ51050BYFPT.pdf
- Description:
- IC WIRELESS PWR RCVR 28DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:835
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Product details
Overview
BQ51050BYFPT 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 up to 1.5 A charge current at 4.20 V regulated output, supports JEITA temperature monitoring via NTC, and achieves 93% peak AC-DC efficiency in portable battery-powered devices.
For engineers reviewing the BQ51050BYFPT datasheet, BQ51050BYFPT pinout, BQ51050BYFPT application, or BQ51050BYFPT equivalent, key selection criteria include its VQFN-20 package with exposed thermal pad, 15-V input overvoltage protection, adaptive VRECT regulation tracking battery voltage, and integrated FOD/communication modulation for transmitter feedback.
Technical Context
The BQ51050BYFPT 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 using capacitive load modulation on COMM1/COMM2 pins while maintaining real-time power transfer stabilization through global feedback to the transmitter.
It integrates low-RDS(on) (100 mΩ typical) N-MOSFETs for both synchronous rectification and LDO-like regulation, enabling VRECT to dynamically track VBAT + 300 mV until reaching 5.11 V regulation-ensuring high efficiency across full charge cycle without external DC-DC stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.20 V ±20 mV - precisely regulated Li-ion termination voltage per JEITA profile |
| Max Charge Current | 1.5 A - programmable via ILIM resistor; enables fast-charging in compact handhelds |
| Peak Efficiency | 93% - achieved by synchronous rectifier + adaptive VRECT tracking, minimizing thermal dissipation |
| Input OVP Threshold | 15 V - protects internal FETs during coil resonance overshoot or misalignment events |
| Thermal Shutdown | 155°C - with 20°C hysteresis, ensuring safe operation under sustained high-power conditions |
| Communication Interface | Capacitive load modulation - uses COMM1/COMM2 pins to reflect impedance changes to transmitter per Qi v1.2 |
| NTC Support | JEITA-compliant temperature sensing - accepts 10-kΩ NTC with β = 3380 for cold/hot charge throttling |
Pinout & Package
Package: VQFN-20 (RHL), 4.50 mm × 3.50 mm, with exposed thermal pad requiring connection to PGND for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | Differential AC input | Connects directly to receiver coil; accepts up to 20 V RMS; dual inputs enable balanced rectification |
| RECT | Rectified output node | Filtered DC output of internal synchronous rectifier; connects to 4.7–22 μF ceramic capacitor to PGND |
| BAT | Charger output | Delivers regulated 4.20 V and up to 1.5 A to Li-ion cell; includes short-circuit detection at 0.8 V |
| ILIM | Charge current programming | Analog input setting IBULK via resistor to PGND; KILIM = 314 A·Ω typical |
| TS/CTRL | Temperature sense & control | Accepts NTC for JEITA compliance; also functions as EPT signal pin to terminate power transfer |
| COMM1 / COMM2 | Qi communication modulator | Open-drain outputs for capacitive load modulation; require external caps to AC1/AC2 per WPC spec |
| PGND | Power ground | Primary return path for high-current paths (AC, RECT, BAT); must connect to thermal pad |
| FOD | Foreign object detection input | Analog input measuring rectified power level; used by internal algorithm to detect metallic interference |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Qi v1.2 controller | Eliminates need for external MCU or protocol stack; handles packet encoding, CRC, and handshake autonomously |
| VRECT dynamic tracking | Maintains VRECT = VBAT + 300 mV until reaching 5.11 V, reducing conduction loss across full SOC range |
| JEITA temperature profiling | Four-point NTC monitoring (0°C, 10°C, 45°C, 60°C) with automatic IBULK reduction above 45°C |
| Single-stage power architecture | Combines rectifier, LDO, charger, and digital control in one chip-reducing BOM count and PCB area vs. multi-chip solutions |
| Robust fault protection | Includes input OVP (15 V), thermal shutdown (155°C), BAT short detection (0.8 V), and ILIM short latching |
Applications
| Smartphone Wireless Charging | Wireless Earbud Case |
|---|---|
Use Scenario: Integrated into smartphone mainboard to replace wired micro-USB charging with Qi-compatible inductive charging. IC Role / Device Role / Timing Role: Acts as primary power conversion and battery management unit-rectifying coil AC, regulating 4.20 V output, and executing JEITA-compliant charge profile. Use Value: Enables slim form factor by eliminating AC-DC adapter and secondary DC-DC stage; 93% efficiency minimizes heat generation near battery. | Use Scenario: Embedded in compact charging case for true wireless stereo earbuds to recharge both earbuds and case battery simultaneously. IC Role / Device Role / Timing Role: Serves as dual-role receiver-charging case Li-ion pack while managing trickle charge to earbud batteries via BAT output. Use Value: Supports 1.5 A max current for rapid case recharging; integrated FOD prevents heating during pocket/charger misplacement. |
| Portable Medical Monitor | Wearable Fitness Tracker |
Use Scenario: Used in sealed, IP67-rated patient monitor where wired ports are prohibited and sterilization requires no connectors. IC Role / Device Role / Timing Role: Provides isolated, contactless power delivery and battery conditioning with strict temperature supervision per medical safety standards. Use Value: JEITA compliance ensures charge suspension above 45°C-critical for skin-contact devices; 15-V OVP guards against coil coupling anomalies. | Use Scenario: Powers ultra-thin wrist-worn tracker with constrained height budget (<0.9 mm), requiring minimal external components. IC Role / Device Role / Timing Role: Functions as complete wireless charging subsystem-handling coil interface, rectification, 4.20 V regulation, and NTC-based thermal derating. Use Value: VQFN-20 package (4.5 × 3.5 mm) fits tight layouts; 20 µA standby IQ preserves battery life during non-charging periods. |
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 | Supports higher 2-A charge current and 4.35-V output; adds I²C interface for host configuration | Requires MCU integration for advanced telemetry; not drop-in compatible due to different pinout and control logic | Select when system needs programmable charge parameters or telemetry reporting beyond Qi baseline |
| MP-A21 | Standalone Qi receiver only-no integrated battery charger; requires external linear or switching charger | Increases BOM count and board area; lacks JEITA temperature management and termination logic | Choose only if existing design already includes discrete charger and demands minimal receiver footprint |
Compared with bq51222YFPR and MP-A21, the BQ51050BYFPT provides the most integrated solution for cost-sensitive, space-constrained consumer devices needing self-contained 4.20-V Li-ion charging without host processor dependency-balancing feature completeness, thermal performance, and layout simplicity.
Availability
BQ51050BYFPT is available at Aetrix Electronics and suitable for smartphone wireless charging, portable medical monitors, wearable fitness trackers, and wireless earbud cases requiring stable component supply and long-term lifecycle support.
Supply support for BQ51050BYFPT 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, signal chain, and wireless connectivity solutions.
The bq5105x product line was designed specifically for compact, high-efficiency Qi v1.2 wireless battery charging in portable electronics-integrating all necessary functions to eliminate external controllers and reduce system-level complexity.
FAQ
What is the function of the TS/CTRL pin on the BQ51050BYFPT?
The TS/CTRL pin on the BQ51050BYFPT serves dual roles: as a temperature sense (TS) input for JEITA-compliant NTC-based thermal monitoring, and as a control (CTRL) pin to send End Power Transfer (EPT) packets to the transmitter. When pulled low, it signals an EPT fault; when pulled high to internal rail, it sends EPT termination. The pin accepts a 10-kΩ NTC with β = 3380 for accurate four-point temperature profiling.
Does the BQ51050BYFPT support multiple battery voltage options?
No-the BQ51050BYFPT is factory-configured for 4.20 V nominal Li-ion battery regulation. Other variants in the family provide different outputs: BQ51051B for 4.35 V and BQ51052B for 4.40 V. The BQ51050BYFPT does not support software or hardware reconfiguration of VBAT-REG; its 4.20 V output is fixed per device option.
How is charge current programmed on the BQ51050BYFPT?
Charge current on the BQ51050BYFPT is set by connecting a resistor (RILIM) between the ILIM pin and PGND. Using KILIM = 314 A·Ω, RILIM = KILIM / IBULK. For example, a 210 kΩ resistor programs 1.5 A (314 / 0.0015 ≈ 209.3 kΩ). The ILIM pin operates as an analog input with 40–55 µA bias current and supports 500 mA to 1.5 A range.
What protection features are built into the BQ51050BYFPT?
The BQ51050BYFPT includes input overvoltage protection (15 V threshold), thermal shutdown (155°C with 20°C hysteresis), BAT short-circuit detection (0.8 V threshold), ILIM short-circuit latching, and precharge timeout (30 min). It also implements JEITA-compliant temperature-based charge throttling and foreign object detection via the FOD pin to prevent unsafe energy transfer.
Can the BQ51050BYFPT operate without an NTC thermistor?
Yes-the BQ51050BYFPT can operate without an NTC thermistor. If temperature monitoring is not required, the TS/CTRL pin must be connected to PGND through a 10-kΩ pull-down resistor. This disables JEITA profiling but retains all other charging and protection functions. The device will then charge at full rate across the full temperature range unless externally managed.
BQ51050BYFPT 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
BQ51050BYFPT FAQ
1.How can I place an order for BQ51050BYFPT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51050BYFPT 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 BQ51050BYFPT reliable?
The price and inventory of BQ51050BYFPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51050BYFPT is usually 5 days.
3.What payment methods are accepted for BQ51050BYFPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51050BYFPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51050BYFPT?
BQ51050BYFPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51050BYFPT 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 BQ51050BYFPT?
For technical support, including BQ51050BYFPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51050BYFPT requirements.
6.How does Aetrix verify that BQ51050BYFPT is sourced from the original manufacturer or authorized distributors?
All BQ51050BYFPT 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 BQ51050BYFPT meets industry standards.
7.What is the process for return or replacement of BQ51050BYFPT?
All BQ51050BYFPT units undergo pre-shipment inspection (PSI). If there is an issue with BQ51050BYFPT, 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 BQ51050BYFPT part is unused and in its original packaging.
Return procedure for BQ51050BYFPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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