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Texas Instruments BQ76942PFBR
- Part No.:
- BQ76942PFBR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-TQFP
- Datasheet:
-
BQ76942PFBR.pdf
- Description:
- 3-SERIES TO 10-SERIES MULTICELL
- Quantity:
- Payment:
- Shipping:
Inventory:632
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Product details
Overview
BQ76942PFBR from Texas Instruments is a high-accuracy, integrated battery monitor and protector IC for 3- to 10-series Li-ion, Li-polymer, and LiFePO₄ battery packs. It performs simultaneous cell voltage (±5 mV accuracy at 25°C), current (±200-mV sense range), and temperature monitoring; integrates high-side NFET charge pump drivers; and supports autonomous or host-controlled cell balancing in a 48-pin TQFP package.
For engineers reviewing the BQ76942PFBR datasheet, BQ76942PFBR pinout, BQ76942PFBR application, or BQ76942PFBR equivalent, key selection considerations include its dual ADC architecture for synchronized sampling, 9 µA DEEPSLEEP power mode, 85-V cell-stack tolerance, I²C/SPI/HDQ interface flexibility, and OTP-programmable LDO outputs for system-level power management.
Technical Context
The BQ76942PFBR implements two independent ADCs: one dedicated to high-accuracy coulomb counting (input offset < 1 µV typical) and another for precise cell voltage measurement (< 10 mV typical error). Its protection subsystem includes configurable overvoltage, undervoltage, overcurrent, and thermal thresholds with both primary and secondary response layers.
It uses an integrated charge pump to drive high-side NFETs for charge/discharge control and supports random cell-attach sequencing during production. The device operates across –40°C to +85°C and tolerates up to 85 V on cell-input pins (VC0–VC10), enabling direct integration into high-voltage e-bike and power tool battery packs without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count support | 3-series to 10-series Li-ion/LiFePO₄ stacks - enables scalable pack design from 12.6 V to 42 V nominal (Li-ion) or 9.6 V to 32 V (LiFePO₄). |
| Cell voltage accuracy | ±5 mV (typical, 25°C) - ensures reliable cell balancing and state-of-charge estimation within tight voltage bands. |
| Coulomb counter offset | < 1 µV (typical) - minimizes integration drift during long-term current sensing across ±200-mV sense resistor range. |
| Operating supply range | 4.7 V to 55 V on BAT pin - supports full operation across wide battery stack voltages including partial discharge states. |
| Low-power modes | DEEPSLEEP: 9–10 µA; SLEEP: 24–41 µA; NORMAL: 286 µA - extends battery pack shelf life and reduces parasitic drain. |
| Communication interfaces | I²C (400 kHz), SPI, HDQ one-wire - provides host MCU flexibility for cost-sensitive (HDQ), noise-immune (SPI), or standard (I²C) implementations. |
| High-voltage tolerance | 85 V on VC0–VC10, PACK, PCHG, PDSG - eliminates need for external clamping diodes in 48-V+ industrial battery systems. |
Pinout & Package
Package: 48-pin TQFP (PFB), 7 mm × 7 mm body size, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC0–VC10 | Cell voltage sense inputs | Direct analog inputs for 11 voltage points (VC0 = bottom of stack, VC10 = top); support cell balancing current injection/return paths. |
| SRP / SRN | Coulomb counter differential inputs | Accept ±200-mV differential signal across external sense resistor; enable high-accuracy current integration with sub-µV offset. |
| CHG / DSG | NMOS FET gate drivers | Active-low outputs driving low-side charge/discharge FETs; support fast turn-off and load detection via LD pin. |
| PCHG / PDSG | PFET precharge/predischarge drivers | Charge-pump-assisted high-side PFET control for safe inrush current limiting and reverse-current blocking. |
| REG1 / REG2 | Programmable LDO outputs | Configurable 1.8 V / 2.5 V / 3.0 V / 3.3 V / 5.0 V outputs for powering external MCU, sensors, or communication transceivers. |
| SCL / SDA / HDQ / CFETOFF / DFETOFF | Multi-function I/O pins | Support I²C, SPI, or HDQ protocols; also serve as thermistor inputs, general-purpose ADC channels, or digital outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous cell balancing | On-chip timing and control eliminate host MCU dependency for passive balancing across all 10 cells. |
| Integrated secondary chemical fuse drive | Dedicated FUSE pin drives external polyfuse or e-fuse for irreversible overcurrent protection independent of FET control logic. |
| Tolerant of random cell attach sequence | Enables automated battery assembly without strict cell connection order - reduces manufacturing test time and failure rate. |
| OTP memory programmability | Customer-programmable one-time memory allows post-manufacturing calibration data, protection thresholds, and configuration storage. |
| Dual independent ADCs | Simultaneous voltage and current sampling prevents timing skew in SoC and SoH calculations under dynamic load conditions. |
Applications
| Cordless Power Tools | E-Bikes & E-Scooters |
|---|---|
|
Use Scenario: High-current, burst-load operation with rapid voltage transients during motor startup and braking. IC Role / Device Role / Timing Role: Real-time cell voltage and current monitoring with <5 mV accuracy; autonomous balancing during idle periods; fast-response overcurrent shutdown. Use Value: Prevents individual cell overvoltage during regenerative braking and maintains pack capacity by correcting cell imbalance after repeated high-C-rate cycles. |
Use Scenario: 36 V–48 V Li-ion battery packs subject to vibration, temperature extremes, and frequent partial charging. IC Role / Device Role / Timing Role: Dual-ADC synchronized sampling for accurate SoC estimation; 85-V tolerant VC pins enable direct connection to full-stack voltage; DEEPSLEEP mode extends standby runtime. Use Value: Enables >500-cycle lifetime by detecting micro-short failures early and maintaining inter-cell voltage delta below 20 mV during field use. |
| Vacuum Cleaners | Non-Military Drones |
|
Use Scenario: Compact, high-power-density 10-cell Li-ion packs with aggressive thermal profiles and space-constrained PCB layout. IC Role / Device Role / Timing Role: Integrated 1.8-V REG18 LDO powers internal circuitry; TS1–TS3 support up to nine external NTC thermistors for per-cell thermal mapping. Use Value: Reduces BOM count by eliminating discrete LDOs and enables thermal runaway detection at cell level before propagation. |
Use Scenario: Weight-sensitive 6S–10S LiPo packs requiring ultra-low quiescent current and robust fault logging for flight safety compliance. IC Role / Device Role / Timing Role: SHUTDOWN mode draws only 1 µA; OTP stores fault history (e.g., overtemperature events) accessible after reboot via I²C. Use Value: Meets UAV airworthiness requirements for non-volatile fault recording and enables post-flight diagnostics without external memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor and protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76952PWPR | 16-channel cell monitoring (vs. 11-channel), higher integration (integrated precision reference, enhanced diagnostics), 6-mm × 6-mm WQFN package | Targeted at 12S–16S EV auxiliary batteries and medical-grade portable devices requiring ASIL-B alignment | Select for higher cell count, tighter accuracy specs (±2 mV), or space-constrained layouts where WQFN thermal performance is critical. |
| MAX17853GCM+ | 14-channel, daisy-chainable architecture; supports ISO 26262 ASIL-C functional safety; no integrated charge pump | Designed for automotive traction battery modules requiring fault-tolerant communication and safety-certified firmware | Select when daisy-chain scalability, automotive qualification, or external high-side driver compatibility (e.g., MAX14920) is required. |
Compared with BQ76942PFBR, the BQ76952PWPR offers extended channel count and improved accuracy but requires revalidation of thermal layout and LDO routing; the MAX17853GCM+ adds safety certification and daisy-chain capability at the cost of higher system complexity and absence of integrated charge pump drivers.
Availability
BQ76942PFBR is available at Aetrix Electronics and suitable for cordless power tools, e-bikes, and vacuum cleaner battery packs requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for BQ76942PFBR 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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in battery management systems.
The BQ76942PFBR belongs to TI's high-accuracy battery monitor and protector product line, engineered specifically for industrial and consumer battery packs demanding precision cell supervision, autonomous protection, and flexible host interface options.
FAQ
What is the maximum cell stack voltage supported by the BQ76942PFBR?
The BQ76942PFBR supports up to 10-series Li-ion cells with an absolute maximum rating of 85 V on VC0–VC10 and PACK pins. This allows direct interfacing with 48-V nominal battery packs (e.g., 13S LiFePO₄ or 10S Li-ion) while maintaining margin for transient overvoltage events. Operation remains functional across the full recommended range of 4.7 V to 55 V on the BAT pin.
Does the BQ76942PFBR integrate a charge pump for high-side FET control?
Yes, the BQ76942PFBR includes an integrated charge pump that drives high-side NFETs for precharge (PCHG) and predischarge (PDSG) functions. This eliminates the need for external charge pump ICs or bootstrap circuits, simplifying layout and improving reliability in high-voltage battery applications such as power tools and e-bikes.
Can the BQ76942PFBR perform simultaneous voltage and current measurements?
Yes, the BQ76942PFBR features two independent ADCs enabling true simultaneous sampling of cell voltages and current via the SRP/SRN inputs. This synchronization prevents phase error in coulomb counting and SoC calculation during dynamic load changes, delivering accurate energy tracking even under pulsed high-current conditions.
What communication interfaces does the BQ76942PFBR support?
The BQ76942PFBR supports three serial interfaces: I²C (up to 400 kHz), SPI, and HDQ one-wire. Pin multiplexing allows SCL/SDA to function as SPI_SCLK/SPI_MISO, and HDQ/CFETOFF/DFETOFF to serve as SPI_MOSI or chip select - enabling flexible host MCU integration without additional protocol translators.
How does the BQ76942PFBR handle temperature monitoring?
The BQ76942PFBR supports temperature sensing using its internal die sensor plus up to nine external NTC thermistors connected to TS1–TS3 and multifunction pins (ALERT, HDQ, CFETOFF, DFETOFF, DCHG, DDSG). Each thermistor input is routed through the same high-accuracy ADC used for voltage and current, ensuring consistent calibration and resolution across all sensing channels.
BQ76942PFBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 3 ~ 10
- Fault Protection:
- Over Current, Over Temperature, Over Voltage, Short Circuit
- Interface:
- I2C, SPI
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP (7x7)
BQ76942PFBR FAQ
1.How can I place an order for BQ76942PFBR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ76942PFBR 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 BQ76942PFBR reliable?
The price and inventory of BQ76942PFBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ76942PFBR is usually 5 days.
3.What payment methods are accepted for BQ76942PFBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ76942PFBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ76942PFBR?
BQ76942PFBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ76942PFBR 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 BQ76942PFBR?
For technical support, including BQ76942PFBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ76942PFBR requirements.
6.How does Aetrix verify that BQ76942PFBR is sourced from the original manufacturer or authorized distributors?
All BQ76942PFBR 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 BQ76942PFBR meets industry standards.
7.What is the process for return or replacement of BQ76942PFBR?
All BQ76942PFBR units undergo pre-shipment inspection (PSI). If there is an issue with BQ76942PFBR, 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 BQ76942PFBR part is unused and in its original packaging.
Return procedure for BQ76942PFBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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