My Inquiry
My Account
Texas Instruments BQ51021YFPT
- Part No.:
- BQ51021YFPT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 42-XFBGA, DSBGA
- Datasheet:
-
BQ51021YFPT.pdf
- Description:
- IC WIRELESS PWR RCVR 42DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:250
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ51021YFPT from Texas Instruments is a WPC v1.1–compliant single-chip wireless power receiver IC integrating synchronous rectification, post-regulation LDO, and full digital communication control. It delivers up to 1.0 A output current at adjustable 4.5–8 V output voltage with 97% post-regulator efficiency and 79% system-level efficiency at 5 W, targeting compact mobile charging applications including smartphones and power banks.
For engineers reviewing the BQ51021YFPT datasheet, BQ51021YFPT pinout, BQ51021YFPT application, or BQ51021YFPT equivalent, key selection criteria include its I²C-enabled programmability (100 kHz), dynamic rectifier control for transient response, hardware current limit via ILIM pin, thermal shutdown at 155°C, and DSBGA-42 (3.60 × 2.89 mm²) package compatibility with space-constrained PCB layouts.
Technical Context
The BQ51021YFPT implements a fully integrated WPC v1.1 receiver stack: bi-phase encoded 2-kb/s communication via COMM1/COMM2 pins, dynamic rectifier control that adjusts VRECT targets based on load percentage (e.g., VOUT + 0.12 V above 40% IILIM), and adaptive power scaling using KILIM/RILIM to optimize LDO dissipation. Its synchronous rectifier operates in full-synchronous mode above 100 mA and transitions to half-synchronous below that threshold.
It features dual-mode operation: wireless power reception with real-time error packet feedback every 250 ms (accelerating to 32 ms during transients), plus adapter mux support via AD/AD-EN pins with 3.5–3.8 V enable threshold and 450 mV hysteresis. Temperature sensing via TS/CTRL pin supports end-power-transfer signaling at 0.38 V and thermal shutdown at 155°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Wireless Standard | WPC v1.1 compliant - enables interoperability with Qi-certified transmitters without firmware development |
| Max Output Current | 1.0 A - supports fast-charging loads such as USB-PD input stages or Li-ion battery chargers |
| Output Voltage Range | 4.5 V to 8 V - set via external resistor divider on VO_REG pin (0.5 V reference), enabling coil and thermal optimization |
| I²C Interface | 100 kHz standard-mode - allows runtime adjustment of VO_REG, FOD scaling, and alignment training via host MCU |
| Thermal Protection | 155°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor thermal design |
| Package | DSBGA-42, 3.60 × 2.89 mm² - ultra-low-profile packaging suitable for <1.0 mm Z-height mobile device stacks |
| System Efficiency | 79% at 5 W - achieved via fully synchronous rectifier (96%), 97% efficient post-regulator, and dynamic power scaling |
Pinout & Package
Package: DSBGA-42 (3.60 × 2.89 mm²), 0.4 mm pitch, bottom-side solder balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1 / AC2 | AC input from resonant tank | Dual differential inputs for primary coil coupling - accepts up to 20 V RMS, supports multi-coil receiver designs |
| RECT | Rectified DC node | Internal synchronous rectifier output - feeds LDO input; regulated to VOUT + 0.12–2.0 V depending on load |
| OUT | Regulated power output | Delivers up to 1.0 A at 4.5–8 V - directly powers downstream charger ICs or battery management systems |
| COMM1 / COMM2 | WPC communication driver | Open-drain FETs modulating reflected impedance - enables bidirectional packet exchange at 2 kb/s |
| SCL / SDA | I²C interface (bq51021 only) | Host-controlled configuration and telemetry - required for VO_REG programming and alignment training |
| ILIM | Hardware current limit sense | Analog input setting overcurrent threshold - RILIM = KILIM/IILIM (KILIM = 842 AΩ) defines 1500 mA max range |
| TS/CTRL | Temperature sense / EPT control | Pull-high to signal charge complete (EPT), pull-low for overtemperature shutdown - interfaces with NTC thermistor |
| WPG / PD_DET | Power-good / pad-detect outputs | Open-drain status indicators - WPG asserts when power transfer active; PD_DET signals presence on TX surface |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Rectifier Control | Adjusts VRECT target in real time (e.g., VOUT + 0.12 V at >40% load) to maintain LDO headroom and improve transient response by up to 1.5 V margin |
| Patented Transmitter Pad Detect | PD_DET pin provides reliable mechanical presence detection - eliminates need for separate proximity sensors in consumer devices |
| Inductorless Receiver Architecture | Eliminates external inductors - reduces BOM count and PCB area while enabling sub-1 mm solution height |
| Adapter Mux Integration | AD/AD-EN pins enable automatic wired/wireless power arbitration - disables TX and routes adapter power when VAD > 3.6 V |
| WPC Alignment Training | I²C-accessible feature allowing host MCU to guide user placement - improves coupling efficiency and reduces charge time |
Applications
| Smartphone Wireless Charging | Portable Power Bank Recharge |
|---|---|
Use Scenario: Integrated receiver in slim smartphone chassis with metal backplate requiring minimal Z-height and thermal footprint. IC Role / Device Role / Timing Role: Primary power conversion and WPC protocol engine - performs synchronous rectification, LDO regulation, and real-time communication with transmitter every 250 ms. Use Value: 79% system efficiency and 97% post-regulator efficiency reduce heat generation in thermally constrained enclosures, extending battery life and user comfort. |
Use Scenario: Bidirectional power bank supporting both wireless input (from charging pad) and wired output (to phone). IC Role / Device Role / Timing Role: Wireless power receiver with adapter priority logic - disables TX and switches to wired input when AC adapter is connected. Use Value: Seamless power source handover avoids charging interruption; AD-EN pin's 3.6 V threshold ensures reliable wired takeover without false triggers. |
| Wi-Fi Hotspot Portable Charger | Tablet Integrated Receiver |
Use Scenario: Battery-powered hotspot with embedded Qi receiver enabling cordless desk-top recharging. IC Role / Device Role / Timing Role: Standalone WPC receiver managing power path to Li-ion pack - uses TS/CTRL pin to signal EPT at full charge and prevent overvoltage. Use Value: Direct integration of temperature-based EPT eliminates need for external microcontroller, reducing cost and firmware complexity. |
Use Scenario: Large-format tablet with dual-coil receiver layout for flexible placement on charging pad. IC Role / Device Role / Timing Role: Dual AC input (AC1/AC2) and dual COMM (COMM1/COMM2) support - enables independent coil control and optimized impedance matching. Use Value: Multi-coil support increases effective charging area by >3× versus single-coil designs, improving UX in larger form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq51020YFPT | No I²C interface; standalone operation only - lacks VO_REG programmability and alignment training capability | Suitable for fixed-output, cost-sensitive designs where host MCU control is unnecessary | Select bq51020YFPT only if I²C configuration is not required and output voltage is fixed via resistor divider |
| bq51221YFPT | Dual-mode (WPC v1.1 + PMA); higher integration including integrated FET drivers and enhanced FOD algorithm | Supports legacy PMA transmitters and offers improved foreign object detection resolution | Choose bq51221YFPT when backward compatibility with PMA infrastructure or tighter FOD tolerance is mandatory |
Compared with bq51020YFPT, BQ51021YFPT adds I²C configurability for dynamic output tuning and alignment assistance, while bq51221YFPT extends protocol coverage to PMA and enhances safety features - making BQ51021YFPT the optimal balance of flexibility, size, and WPC-specific performance.
Availability
BQ51021YFPT is available at Aetrix Electronics and suitable for smartphone wireless charging, portable power bank recharge, Wi-Fi hotspot portable charging, and tablet integrated receiver applications requiring stable component supply across high-volume production cycles.
Supply support for BQ51021YFPT 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 bq5102x product line was designed specifically for compact, high-efficiency WPC v1.1 wireless power receivers - emphasizing minimal solution size, thermal resilience, and seamless integration into consumer mobile platforms.
FAQ
What is the maximum output current supported by the BQ51021YFPT?
The BQ51021YFPT supports a maximum continuous output current of 1.0 A under recommended operating conditions (TJ ≤ 125°C). This rating is enforced by the hardware current limit circuit tied to the ILIM pin, where RILIM sets the threshold per KILIM/IILIM (KILIM = 842 AΩ). The device also delivers up to 3.7 A peak for 1 ms during short-circuit events before latching off.
How does the BQ51021YFPT achieve 79% system efficiency at 5 W?
The BQ51021YFPT achieves 79% system efficiency through three integrated techniques: a fully synchronous rectifier delivering 96% efficiency, a 97% efficient post-regulator LDO, and Dynamic Power Scaling that adjusts LDO headroom based on real-time load - minimizing conduction losses across the full 0–1.0 A range while maintaining transient response.
Can the BQ51021YFPT be used without an I²C host controller?
No - the BQ51021YFPT requires an I²C host controller for essential configuration, including VO_REG voltage setting, FOD calibration, and alignment training. Unlike the pin-compatible bq51020YFPT, the BQ51021YFPT does not support standalone operation; SCL and SDA pins must be connected and initialized to enable power delivery.
What is the function of the TS/CTRL pin on the BQ51021YFPT?
The TS/CTRL pin on the BQ51021YFPT serves dual functions: it monitors temperature via an external NTC thermistor network, and it signals end-of-power-transfer (EPT) to the transmitter. Pulling TS/CTRL high sends "charge complete"; pulling low triggers thermal shutdown at 155°C. Its internal bias is 1.8 V, and it asserts EPT at 0.38 V during overtemperature events.
Does the BQ51021YFPT support adapter priority functionality?
Yes - the BQ51021YFPT supports adapter priority via AD and AD-EN pins. When VAD exceeds 3.6 V (with 450 mV hysteresis), the device disables wireless power transfer, sends EPT to the transmitter, and enables the external back-to-back PMOS switch to route adapter power to OUT. This ensures wired power always takes precedence over wireless input.
BQ51021YFPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 42-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Wireless Power Receiver
- Current - Supply:
- 2.5A
- Voltage - Supply:
- 4V ~ 10V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 42-DSBGA
BQ51021YFPT FAQ
1.How can I place an order for BQ51021YFPT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ51021YFPT 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 BQ51021YFPT reliable?
The price and inventory of BQ51021YFPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ51021YFPT is usually 5 days.
3.What payment methods are accepted for BQ51021YFPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ51021YFPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ51021YFPT?
BQ51021YFPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ51021YFPT 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 BQ51021YFPT?
For technical support, including BQ51021YFPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ51021YFPT requirements.
6.How does Aetrix verify that BQ51021YFPT is sourced from the original manufacturer or authorized distributors?
All BQ51021YFPT 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 BQ51021YFPT meets industry standards.
7.What is the process for return or replacement of BQ51021YFPT?
All BQ51021YFPT units undergo pre-shipment inspection (PSI). If there is an issue with BQ51021YFPT, 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 BQ51021YFPT part is unused and in its original packaging.
Return procedure for BQ51021YFPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ51021YFPT 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…
