Product Overview
The BQ51051BRHLR from Texas Instruments is a Qi v1.2-compliant wireless power receiver with integrated Li-Ion/Li-Pol battery charger, 1.5A charging, 93% efficiency, and 20-pin VQFN package.
Key Specifications
| Type | Qi-Compliant Wireless Power Receiver and Battery Charger |
| WPC Standard | Qi v1.2 compliant |
| Battery Charge Voltage | 4.35V (4.20V/4.40V options available) |
| Charge Current | Up to 1.5A |
| AC-DC Efficiency | 93% (peak) |
| Input Voltage (RECT) | 4V to 10V (recommended); 20V max (absolute) |
| Synchronous Rectifier RDS(ON) | 100 mOhm (typical) |
| Communication | Qi v1.2 inductive (capacitive/resistive load modulation) |
| Supply Current | 8 mA (typical) |
| Temperature Monitoring | TS/CTRL pin with NTC threshold detection |
| Package | VQFN-20 (RHL, 3.5 x 4.5 mm) |
| Operating Temperature | 0C to +125C (junction) |
Features
- Single-stage wireless power receiver + battery charger
- Qi v1.2 communication protocol compliant
- 93% peak AC-DC charging efficiency
- Low-impedance synchronous rectifier (100mOhm RDS(ON))
- Overvoltage protection (20V max input)
- Overcurrent, thermal shutdown, and fault detection
- NTC temperature monitoring via TS/CTRL pin
- AD pin for wired adapter override
- Dynamic rectifier voltage control for efficiency
- Smartphone wireless charging
- Wireless headset charging
- Portable device battery packs
- Wearable device charging
- Smartphone wireless charging with 4.35V Li-Pol battery, 1.5A CC/CV charging via Qi v1.2 protocol and 93% AC-DC efficiency
- Wireless headset charging dock using bq51051B with AD pin for USB-C wired override when plugged in
- Wearable device wireless power with FOD safety and NTC temperature monitoring for safe Li-Ion charging
- Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
- Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
- Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.
- Accepted Payment Methods
- T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
- PayPal: Ideal for small orders, sample orders and quick payments.
Settlement Currency
US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.
Bank Charges
All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.
- Payment Requirements
- Sample and small orders: Shipment will be arranged upon full payment.
- In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.
- Logistics Partners
- International Express: DHL, FedEx, UPS, TNT
- Economy Logistics: Air freight and sea freight for large-volume cargo
- Domestic Delivery: SF Express, Yunda Express
- Order Processing Time
- In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
- Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
- Estimated Transit Time
- International Express: 3 – 7 working days globally
- Air Freight: 7 – 12 working days
- Sea Freight: 25 – 40 working days for heavy and large bulk cargo
- Shipping Fee Rules
- Shipping cost is calculated based on package weight, volume, destination and delivery method.
- Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
- Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
- Shipment Tracking
Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.
MOQ & Sample Service
We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.
Packaging Standard
All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.
Import Duties & Taxes
All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.
- Handling of Lost or Damaged Goods
- In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
- We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.
- Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
- Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
- Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.
- All components are packed separately to avoid damage caused by friction and collision;
- Shockproof buffer materials are added for fragile products to ensure transportation safety;
- Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.
- Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
- Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
- Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
- Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
- Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.
Applications
The BQ51051BRHLR from Texas Instruments is a single-chip Qi v1.2-compliant wireless power receiver with an integrated Li-Ion/Li-Pol battery charge controller. The device combines the wireless power receiver (AC-DC rectifier), digital controller for Qi communication, and battery charge controller into a single 3.5×4.5mm VQFN-20 package, minimizing external component count. The synchronous rectifier uses low-RDS(ON) N-MOSFETs (100mOhm typical) to achieve 93% peak AC-DC charging efficiency. The rectified output feeds an LDO that regulates the battery charge voltage and current. The 4.35V charge voltage supports Li-Pol batteries with 4.35V chemistry; 4.20V and 4.40V voltage options are available in the bq51050B and bq51052B variants. The Qi v1.2 communication is implemented through capacitive or resistive load modulation on the COMM1/COMM2 pins, which vary the reflected impedance seen by the transmitter coil to regulate power transfer and send control data. The dynamic rectifier voltage control adjusts the rectifier output voltage to track the battery voltage, minimizing the voltage drop across the LDO and maximizing efficiency across the full charge cycle. The AD pin allows a wired adapter to override wireless charging, automatically switching to the wired source when detected.
The BQ51051BRHLR operates as a complete wireless power transfer receiver system. The AC signal from the receiver coil (connected to AC1/AC2) is rectified by the internal synchronous rectifier, which uses N-MOSFETs driven by a zero-current switching controller to minimize losses. The rectified DC voltage at the RECT pin is monitored and regulated by the digital controller through Qi communication with the transmitter. The receiver communicates with the transmitter by modulating the load on the receiver coil (capacitive modulation via COMM1/COMM2), which creates a reflected impedance change detectable by the transmitter. The Qi v1.2 protocol sends control error packets to increase or decrease the transmitted power, maintaining the RECT voltage within the target range. The LDO stage regulates the rectified voltage down to the battery charge voltage (4.35V). The battery charge controller implements a CC/CV profile: constant current (up to 1.5A) until the battery reaches 4.35V, then constant voltage until the current tapers to the termination threshold set by the ILIM/TERM pins. The TS/CTRL pin monitors an external NTC thermistor on the battery pack and suspends charging if the temperature is outside the safe range. The FOD (Foreign Object Detection) feature monitors the received power and compares it with the measured battery charge power, reducing the transmitted power if excessive loss is detected (indicating a foreign metal object absorbing power). The AD-EN pin enables an external wired adapter path, which overrides the wireless power when detected.
| Pin | Name | Type | Function |
|---|---|---|---|
| 1,20 | PGND | Power | Power ground |
| 2 | AC1 | Input | Receiver coil input 1 |
| 3 | BOOT1 | I/O | Bootstrap capacitor for rectifier HS FET 1 |
| 4 | BAT | Output | Battery charge output (4.35V, 1.5A max) |
| 5 | CLMP1 | Output | Overvoltage clamp capacitor 1 |
| 6 | COMM1 | Output | Qi communication load modulation 1 |
| 7 | CHG | Output | Charge status output (open-drain) |
| 8 | AD-EN | Output | Adapter detect enable (active when AD>VBAT) |
| 9 | AD | Input | Wired adapter input (overrides wireless) |
| 10 | TERM | Input | Charge termination current set resistor |
| 11 | EN2 | Input | Enable control input |
| 12 | ILIM | Input | Charge current limit set resistor |
| 13 | TS/CTRL | Input | NTC temperature sense / control input |
| 14 | FOD | Input | Foreign Object Detection calibration resistor |
| 15 | COMM2 | Output | Qi communication load modulation 2 |
| 16 | CLMP2 | Output | Overvoltage clamp capacitor 2 |
| 17 | BOOT2 | I/O | Bootstrap capacitor for rectifier HS FET 2 |
| 18 | RECT | Output | Rectified DC voltage (4-10V) |
| 19 | AC2 | Input | Receiver coil input 2 |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| TI | BQ51050BRHLR | VQFN-20 | 4.20V battery voltage option |
| TI | BQ51052BRHLR | VQFN-20 | 4.40V battery voltage option |
| TI | BQ51013ARHLR | VQFN-28 | Qi v1.1, separate VOUT (no charger) |
| NXP | NT8034UK | WLCSP-28 | Qi receiver, similar function |
| IDT | P9221-R | QFN-32 | Qi receiver with WPC 1.2 |
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