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Texas Instruments BQ51051BRHLT
- Part No.:
- BQ51051BRHLT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
BQ51051BRHLT.pdf
- Description:
- IC WIRELESS PWR RCVR 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:194
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Product details
Overview
BQ51051BRHLT from Texas Instruments is a Qi v1.2-compliant wireless power receiver IC integrating synchronous rectification, battery charge control, and digital communication for Li-ion/Li-polymer charging. It delivers 4.35-V regulated output, supports up to 1.5 A charge current, achieves 93% peak AC-DC efficiency, and operates with input voltage tracking (VRECT tracks VBAT + 300 mV) - deployed in smartphones and portable media players.
For engineers reviewing the BQ51051BRHLT datasheet, BQ51051BRHLT pinout, BQ51051BRHLT application, or BQ51051BRHLT equivalent, key selection criteria include its 4.35-V battery regulation, JEITA-compliant temperature monitoring via TS/CTRL pin, integrated FOD and communication modulation (COMM1/COMM2), and VQFN-20 package with exposed thermal pad for thermal management in space-constrained wireless charging receivers.
Technical Context
The BQ51051BRHLT implements a single-stage architecture combining AC-to-DC conversion and constant-current/constant-voltage battery charging in one die. Its synchronous rectifier uses low-RDS(on) N-MOSFETs (100 mΩ typical), and the power stage dynamically adjusts VRECT regulation - switching between VBAT + 300 mV tracking and fixed 5.11 V - based on load current thresholds (e.g., IEndTrack = 0.35 × IBULK).
Digital control enforces WPC v1.2 compliance through capacitive load modulation via COMM1/COMM2 pins and real-time foreign object detection (FOD) using the FOD pin. Temperature sensing is implemented via an NTC network connected to TS/CTRL, supporting JEITA profile with cold/hot thresholds at 0°C, 10°C, 45°C, and 60°C - all internally referenced to a 2.2-V bias (VTSB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.35 V ±20 mV - precisely regulated Li-ion termination voltage enabling full capacity charging without overvoltage risk. |
| Max Charge Current | 1.5 A - programmable via ILIM resistor (KILIM = 314 AΩ), supporting fast-charge profiles for sub-2-hour battery replenishment. |
| AC-DC Efficiency | 93% peak - achieved via synchronous rectification and adaptive VRECT regulation, minimizing thermal dissipation in compact handheld layouts. |
| VRECT Regulation | Tracks VBAT + 300 mV until IBAT drops below 0.35 × IBULK, then switches to fixed 5.11 V - maintains high efficiency across full charge cycle. |
| Input OVP Threshold | 15 V ±0.5 V - protects internal rectifier and power stage from coil-induced transients during misalignment or foreign metal presence. |
| Thermal Shutdown | 155°C with 20°C hysteresis - safeguards against sustained overload or poor PCB thermal design without requiring external sensors. |
| NTC Interface | Supports 10-kΩ NTC (Beta = 3380) with internal 20-kΩ pullup - enables JEITA-compliant charge throttling at 0°C, 10°C, 45°C, and 60°C thresholds. |
Pinout & Package
Package: VQFN-20 (RHL), 4.50 mm × 3.50 mm, with exposed thermal pad (must be connected to PGND for thermal and electrical integrity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | AC input terminals | Connect directly to receiver coil; accept unrectified AC from inductive coupling - rated for ±0.8 V to 20 V, 2 A RMS. |
| RECT | Rectified output node | Filtered DC output of internal synchronous rectifier; connects to 4.7–22 µF ceramic capacitor to PGND for ripple suppression. |
| BAT | Charger output | Delivers regulated 4.35-V, up to 1.5-A current directly to battery; includes short-circuit protection (0.8 V threshold) and precharge mode. |
| COMM1 / COMM2 | Qi communication modulators | Open-drain outputs for capacitive load modulation - vary reflected impedance to transmit control packets (e.g., power request, EPT) to transmitter. |
| TS/CTRL | Temperature sense & control | Bi-function pin: accepts NTC for JEITA thermal regulation; also accepts logic-level control to send End Power Transfer (EPT) fault/termination signals. |
| ILIM | Charge current programming | Analog input setting IBULK via external resistor (RILIM); KILIM = 314 AΩ yields 1.0 A when RILIM = 314 kΩ. |
| FOD | Foreign object detection input | Analog input measuring rectified power level - used by internal algorithm to detect metallic interference per WPC v1.2 requirements. |
| PGND | Power ground | Primary return path for high-current paths (AC1/AC2, RECT, BAT); must be low-impedance and thermally coupled to exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Qi v1.2 controller | Eliminates need for external MCU or protocol stack - handles packet encoding/decoding, checksum validation, and dynamic power control negotiation autonomously. |
| Synchronous rectifier + LDO in one stage | Reduces component count and board area vs. discrete rectifier + linear charger; 100-mΩ RDS(on) MOSFETs minimize conduction loss at high current. |
| Adaptive VRECT regulation | Switches between VBAT+300 mV tracking and fixed 5.11 V based on battery current - sustains >90% efficiency from 10% to 100% SOC. |
| JEITA-compliant thermal management | Four-point NTC monitoring (0°C/10°C/45°C/60°C) with automatic charge current reduction and voltage derating - meets safety standards for consumer Li-ion devices. |
| Wired/wireless priority arbitration | EN2 and AD/AD-EN pins enable seamless transition between wired adapter and wireless charging - prevents conflict and ensures optimal source selection. |
Applications
| Smartphones | Wireless Earbuds |
|---|---|
|
Use Scenario: Integrated into slim smartphone PCBs where space prohibits separate rectifier and charger ICs. IC Role / Device Role / Timing Role: Single-chip wireless power receiver and battery charger - replaces discrete AC-DC converter + linear charger + Qi controller. Use Value: Reduces BOM count by ≥3 components and saves ≥25 mm² PCB area while maintaining 4.35-V Li-ion compliance and 93% efficiency. |
Use Scenario: Enables compact, sealed earbud charging cases with no exposed USB ports. IC Role / Device Role / Timing Role: Wireless battery charger with integrated FOD and thermal cutoff - critical for small-form-factor, safety-certified wearables. Use Value: Delivers 1.5-A peak charge current within 4.5 × 3.5 mm footprint and shuts down at 155°C - satisfies IEC 62368-1 thermal limits. |
| Portable Media Players | Bluetooth Headsets |
|
Use Scenario: Powers high-capacity batteries (≥2000 mAh) in media players with rapid wireless top-up capability. IC Role / Device Role / Timing Role: High-efficiency AC-DC converter and CC/CV charger - manages full charge cycle from 0% to 100% SOC without external supervision. Use Value: Achieves 93% peak efficiency across 4–10 V input range, reducing heat rise in plastic enclosures during multi-hour charging sessions. |
Use Scenario: Embedded in compact headset charging docks requiring reliable, low-power wireless charging. IC Role / Device Role / Timing Role: Low-quiescent-current (12–20 µA) standby-mode receiver - minimizes self-discharge when docked but not actively charging. Use Value: Extends dock battery life by >3× vs. legacy solutions, enabling months of standby without recharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq51050BRHLT | 4.20-V regulated output; JEITA thermal profile only (no modified JEITA); same pinout and package. | Targeted at standard 4.2-V Li-ion cells; lacks 4.35-V optimization for higher-energy-density batteries. | Select for cost-sensitive designs using conventional Li-ion cells where 4.35-V tolerance is unnecessary. |
| bq51052BRHLT | 4.40-V regulated output; modified JEITA profile; max 1.0-A charge current; same pinout and package. | Optimized for high-voltage Li-ion (e.g., LiCoO₂ variants) with tighter thermal derating above 45°C. | Choose when battery chemistry requires 4.40-V termination and thermal safety margins exceed standard JEITA. |
Compared with bq51050BRHLT and bq51052BRHLT, the BQ51051BRHLT provides the industry-standard 4.35-V Li-ion termination voltage with full JEITA support - making it the optimal choice for mainstream smartphones and portable devices balancing energy density, safety, and compatibility.
Availability
BQ51051BRHLT is available at Aetrix Electronics and suitable for smartphones, wireless earbuds, portable media players, Bluetooth headsets, and battery packs requiring stable component supply, long-term lifecycle support, and WPC v1.2 certification readiness.
Supply support for BQ51051BRHLT 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 power technologies, with decades of leadership in power management ICs and industrial-grade reliability.
The bq5105xB family is designed specifically for compact, high-efficiency wireless battery charging in consumer portable electronics - integrating Qi v1.2 compliance, thermal safety, and Li-ion charge control in monolithic silicon.
FAQ
What is the regulated output voltage of the BQ51051BRHLT?
The BQ51051BRHLT provides a precise 4.35-V regulated output voltage for Li-ion/Li-polymer battery charging, with a typical tolerance of ±20 mV under 1-A load. This value is factory-trimmed and maintained across temperature and line variations - ensuring safe, full-capacity charging without overvoltage stress on the battery cell. The BQ51051BRHLT does not support user-adjustable output voltage.
How does the BQ51051BRHLT implement foreign object detection (FOD)?
The BQ51051BRHLT performs FOD by monitoring the rectified power level at the FOD pin, comparing it against expected values derived from communication packets and system efficiency models. When anomalous power absorption is detected - indicating metallic interference - the device triggers an EPT fault via TS/CTRL or COMM lines to halt power transfer. This complies fully with WPC v1.2 Section 6.3.2 requirements.
Can the BQ51051BRHLT be used with both wired and wireless charging sources?
Yes, the BQ51051BRHLT supports dual-source operation via EN2 and AD/AD-EN pins. When EN2 is low and AD voltage is present, wired charging takes priority and disables wireless operation. AD-EN drives an external PFET to enable the wired path. This arbitration is hardware-based and requires no firmware - enabling seamless fallback in hybrid-charging designs using the BQ51051BRHLT.
What NTC thermistor specifications are required for JEITA compliance with the BQ51051BRHLT?
The BQ51051BRHLT requires a 10-kΩ NTC thermistor at 25°C with Beta = 3380, connected between TS/CTRL and PGND. The device's internal 20-kΩ pullup and four comparator thresholds (0°C, 10°C, 45°C, 60°C) are calibrated for this exact NTC - deviations cause inaccurate thermal regulation. Using alternate NTCs invalidates JEITA compliance and may trigger premature charge termination or unsafe operation.
What is the thermal pad connection requirement for the BQ51051BRHLT VQFN package?
The exposed thermal pad on the BQ51051BRHLT (RHL package) must be soldered to a solid PGND copper pour with ≥4 thermal vias (0.3-mm diameter) connecting to inner-layer ground planes. TI specifies this for both electrical safety and thermal performance - failure to connect the pad results in junction temperature exceeding 155°C under 1.5-A load, triggering thermal shutdown and compromising reliability of the BQ51051BRHLT.
BQ51051BRHLT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- 20-VQFN (3.5x4.5)
BQ51051BRHLT FAQ
1.How can I place an order for BQ51051BRHLT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51051BRHLT 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 BQ51051BRHLT reliable?
The price and inventory of BQ51051BRHLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51051BRHLT is usually 5 days.
3.What payment methods are accepted for BQ51051BRHLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51051BRHLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51051BRHLT?
BQ51051BRHLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51051BRHLT 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 BQ51051BRHLT?
For technical support, including BQ51051BRHLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51051BRHLT requirements.
6.How does Aetrix verify that BQ51051BRHLT is sourced from the original manufacturer or authorized distributors?
All BQ51051BRHLT 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 BQ51051BRHLT meets industry standards.
7.What is the process for return or replacement of BQ51051BRHLT?
All BQ51051BRHLT units undergo pre-shipment inspection (PSI). If there is an issue with BQ51051BRHLT, 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 BQ51051BRHLT part is unused and in its original packaging.
Return procedure for BQ51051BRHLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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