My Inquiry
My Account
Texas Instruments BQ51051BYFPT
- Part No.:
- BQ51051BYFPT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-XFBGA, DSBGA
- Datasheet:
-
BQ51051BYFPT.pdf
- Description:
- IC WIRELESS PWR RCVR 28DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:584
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ51051BYFPT 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 15-V input overvoltage protection - used in smartphones and portable media players for contactless battery charging.
For engineers reviewing the BQ51051BYFPT datasheet, BQ51051BYFPT pinout, BQ51051BYFPT application, or BQ51051BYFPT equivalent, key selection criteria include its VQFN-20 package, JEITA-compliant temperature monitoring via TS/CTRL pin, ILIM-programmable charge current, and dual-mode (wireless/wired) priority control via EN2 and AD-EN pins.
Technical Context
The BQ51051BYFPT 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 its digital controller executes WPC v1.2 packet-based communication via COMM1/COMM2 for closed-loop power regulation.
It features adaptive voltage tracking (VRECT tracks VBAT + 300 mV until IBAT drops below 0.35 × IBULK, then switches to fixed 5.11-V regulation), integrated thermal shutdown (155°C), and programmable termination current (via TERM pin and KTERM = 200–280 Ω/%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.35 V ±20 mV - precisely regulated Li-ion termination voltage for full-capacity charging without overvoltage stress. |
| Max Charge Current | 1.5 A - set by external resistor on ILIM pin; enables fast-charging in compact handheld devices. |
| AC-DC Efficiency | 93% peak - minimizes thermal rise in sealed enclosures and extends coil/coil coupling margin. |
| Input OVP Threshold | 15 V ±0.5 V - protects internal rectifier and LDO from transient surges during misaligned or high-coupling wireless charging. |
| Thermal Shutdown | 155°C with 20°C hysteresis - prevents permanent damage during sustained high-power operation or poor PCB thermal design. |
| Communication Protocol | WPC Qi v1.2 compliant - ensures interoperability with certified transmitters and supports dynamic power control via backscatter modulation. |
| Package | VQFN-20 (4.5 mm × 3.5 mm, 0.5-mm pitch) with exposed thermal pad - enables high-density layout and efficient heat dissipation to PCB ground plane. |
Pinout & Package
VQFN-20 package with exposed thermal pad (connected to PGND); 0.5-mm pitch, 4.5 mm × 3.5 mm body size, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | Differential AC input | Connects directly to receiver coil; accepts unrectified RF energy (up to 20 V, 2 A RMS); requires BOOT1/BOOT2 decoupling. |
| BAT | Regulated battery output | Delivers controlled 4.35-V, up to 1.5-A charging current; includes reverse-voltage protection (VRECT-REV ≥ 8.3 V). |
| ILIM | Charge current programming | Analog input setting IBULK via RILIM; KILIM = 314 AΩ yields 1.0 A at R = 314 Ω (500 mA–1.5 A range supported). |
| TS/CTRL | Temperature sense & control | Accepts NTC network (10 kΩ @ 25°C, β = 3380) for JEITA compliance; also serves as EPT signal pin (pull low/high to terminate power transfer). |
| EN2 | Charging source priority | Logic input: low enables wired adapter charging (if AD voltage present); high enables wireless-only mode. |
| COMM1 / COMM2 | Qi communication modulator | Open-drain outputs for capacitive load modulation; interface with RECT node to reflect impedance changes to transmitter per WPC spec. |
| PGND | Power ground | Primary return path for rectifier, charger, and FET drivers; must be connected to exposed thermal pad for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectifier + LDO | Eliminates need for external diodes or linear regulators; reduces BOM count and improves efficiency across 4–10 V RECT input range. |
| Programmable JEITA temperature profile | Supports full JEITA compliance (bq51051B) with cold/hot thresholds (0°C, 10°C, 45°C, 60°C) and voltage derating - critical for safe charging in varying ambient conditions. |
| Dynamic VRECT tracking | Adjusts rectifier output voltage to track battery voltage + 300 mV during bulk charge, minimizing conduction loss and improving thermal performance. |
| Wired/wireless coexistence logic | EN2 and AD-EN pins enable seamless transition between adapter and wireless sources without firmware intervention or external logic. |
| Robust fault protection suite | Includes input overvoltage (15 V), thermal shutdown (155°C), battery short detection (0.8 V threshold), and ILIM short latch-off - reduces system-level safety validation effort. |
Applications
| Smartphones | Wireless Earbuds |
|---|---|
|
Use Scenario: Integrated into slim smartphone chassis where space prohibits wired charging-only solutions and thermal headroom is limited. IC Role / Device Role / Timing Role: Primary wireless battery charger IC - handles AC rectification, Qi protocol negotiation, CC/CV charging, and thermal regulation autonomously. Use Value: Enables 93% efficient direct battery charging without secondary DC-DC stage, reducing component count and PCB area while meeting Qi v1.2 certification requirements. |
Use Scenario: Embedded in compact earbud charging case to deliver regulated 4.35-V charge to small Li-polymer cells (e.g., 50–100 mAh). IC Role / Device Role / Timing Role: Standalone wireless receiver and charger - manages low-current (<500 mA) charging with precise termination and temperature-aware JEITA profiling. Use Value: Supports ultra-low quiescent current (12–20 µA standby) and accurate 100-mA termination (via TERM pin), extending case battery life between charges. |
| Portable Media Players | Bluetooth Headsets |
|
Use Scenario: Used in mid-size portable media players requiring >1-A charging and robust thermal management during extended playback + charging. IC Role / Device Role / Timing Role: High-efficiency power conversion and charging controller - coordinates rectifier, LDO, and battery interface with real-time feedback to transmitter. Use Value: Delivers 1.5-A max charge current with <190-mV dropout and integrated thermal shutdown, preventing overheating during simultaneous use and charging. |
Use Scenario: Deployed in premium Bluetooth headsets needing reliable, compact wireless charging with battery health preservation. IC Role / Device Role / Timing Role: Wireless power interface and smart charger - implements JEITA-compliant voltage derating above 45°C and precise recharge threshold (VBAT-REG −125 mV). Use Value: Extends cycle life by limiting charge voltage at elevated temperatures and enabling safe top-up charging after partial discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq51050BYFPT | Fixed 4.20-V output; JEITA temperature profile only (no modified JEITA); same pinout and package. | Suitable for standard Li-ion cells requiring 4.20-V termination; lacks higher-voltage support for newer chemistries. | Select when legacy 4.20-V battery chemistry is used and modified JEITA is unnecessary. |
| bq51052BYFPT | 4.40-V output; modified JEITA profile (reduced hot-zone voltage); 1.0-A max charge current (vs. 1.5 A). | Optimized for high-energy-density Li-ion cells requiring elevated termination voltage and tighter thermal derating above 45°C. | Select for next-gen batteries needing 4.40-V charge and enhanced thermal safety margins in compact form factors. |
Compared with bq51050BYFPT and bq51052BYFPT, the BQ51051BYFPT provides the optimal balance of 4.35-V termination (widely adopted for modern Li-ion), full JEITA compliance, and 1.5-A charging capability - making it the preferred choice for mainstream smartphones and mid-tier portable devices.
Availability
BQ51051BYFPT is available at Aetrix Electronics and suitable for smartphones, wireless earbuds, and portable media players requiring stable component supply, long-term lifecycle support, and full WPC Qi v1.2 interoperability assurance.
Supply support for BQ51051BYFPT 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 technologies, with leadership in power management and connectivity solutions.
The bq5105xB family is designed specifically for Qi-compliant wireless battery charging in space-constrained portable electronics - integrating rectification, regulation, communication, and safety functions into a single monolithic IC.
FAQ
What is the regulated output voltage of the BQ51051BYFPT?
The BQ51051BYFPT provides a fixed 4.35-V regulated output voltage with ±20-mV tolerance at 1-A load. This value is factory-trimmed and does not require external feedback components. The BQ51051BYFPT maintains this voltage across its full operating temperature range (0°C to 125°C junction) and load current (0–1.5 A), ensuring consistent Li-ion cell termination without additional regulation circuitry.
How is charge current programmed on the BQ51051BYFPT?
Charge current on the BQ51051BYFPT is set via an external resistor (RILIM) connected between the ILIM pin and PGND. Using the formula RILIM = KILIM / IBULK, where KILIM = 314 AΩ (typical), a 314-Ω resistor programs 1.0-A charge current. The BQ51051BYFPT supports 500 mA to 1.5 A, and the ILIM pin tolerates up to 7 V, allowing direct connection to common bias rails.
Does the BQ51051BYFPT support both wireless and wired charging simultaneously?
No - the BQ51051BYFPT uses the EN2 pin to select priority: when EN2 is high, only wireless charging is enabled; when EN2 is low and AD voltage is present, wired charging takes precedence and wireless is disabled. The AD-EN pin drives an external PFET to enable the wired path. This ensures no conflict between power sources and eliminates risk of backfeed or overvoltage.
What NTC thermistor specifications are required for JEITA compliance with the BQ51051BYFPT?
The BQ51051BYFPT requires a 10-kΩ (nominal at 25°C), β = 3380 NTC thermistor connected between TS/CTRL and PGND. The internal 20-kΩ pullup ensures accurate voltage division across the NTC, enabling precise detection of 0°C, 10°C, 45°C, and 60°C thresholds per JEITA standards. Deviation from these values causes incorrect thermal derating or failure to enter cold/hot protection modes.
What package type and thermal considerations apply to the BQ51051BYFPT?
The BQ51051BYFPT is offered exclusively in the RHL (VQFN-20) package: 4.5 mm × 3.5 mm, 0.5-mm pitch, with an exposed thermal pad. This pad must be soldered to a solid PGND copper area on the PCB to achieve the specified RθJA of 37.7°C/W. Failure to connect the thermal pad increases junction temperature by >30°C under 1.5-A load, risking thermal shutdown or reduced reliability.
BQ51051BYFPT 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
BQ51051BYFPT FAQ
1.How can I place an order for BQ51051BYFPT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51051BYFPT 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 BQ51051BYFPT reliable?
The price and inventory of BQ51051BYFPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51051BYFPT is usually 5 days.
3.What payment methods are accepted for BQ51051BYFPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51051BYFPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51051BYFPT?
BQ51051BYFPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51051BYFPT 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 BQ51051BYFPT?
For technical support, including BQ51051BYFPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51051BYFPT requirements.
6.How does Aetrix verify that BQ51051BYFPT is sourced from the original manufacturer or authorized distributors?
All BQ51051BYFPT 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 BQ51051BYFPT meets industry standards.
7.What is the process for return or replacement of BQ51051BYFPT?
All BQ51051BYFPT units undergo pre-shipment inspection (PSI). If there is an issue with BQ51051BYFPT, 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 BQ51051BYFPT part is unused and in its original packaging.
Return procedure for BQ51051BYFPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ51051BYFPT Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
