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Texas Instruments BQ7694204PFBR
- Part No.:
- BQ7694204PFBR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-TQFP
- Datasheet:
-
BQ7694204PFBR.pdf
- Description:
- 3-SERIES TO 10-SERIES MULTICELL
- Quantity:
- Payment:
- Shipping:
Inventory:249
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Product details
Overview
BQ7694204PFBR from Texas Instruments is a high-accuracy battery monitor and protector IC for 3- to 10-series Li-ion, Li-polymer, and LiFePO₄ battery packs. It integrates dual ADCs for simultaneous voltage/current sampling, ±200-mV current sense range, <10 mV typical cell voltage measurement error, autonomous or host-controlled cell balancing, and 48-pin TQFP (PFB) packaging. It serves as the core protection and telemetry controller in cordless power tools and e-bikes.
For engineers reviewing the BQ7694204PFBR datasheet, BQ7694204PFBR pinout, BQ7694204PFBR application, or BQ7694204PFBR equivalent, key selection criteria include its SPI interface with CRC enabled, 3.3-V REG1 LDO default configuration, 9–10 µA DEEPSLEEP current, integrated charge pump for high-side NFET drive, and support for up to nine external thermistors with internal diagnostics.
Technical Context
The BQ7694204PFBR implements two independent ADCs: one dedicated to high-accuracy coulomb counting (input offset <1 µV typ.) and another for synchronized cell voltage acquisition (<10 mV error over –40°C to 85°C). Its protection subsystem includes configurable overvoltage, undervoltage, overtemperature, and overcurrent triggers with both primary and secondary response layers.
It supports autonomous cell balancing via integrated FET drivers and offers three low-power modes-SLEEP (24–41 µA), DEEPSLEEP (9–10 µA), and SHUTDOWN (1 µA)-with wake-on-LD or TS2 functionality. The device uses a 400-kHz SPI interface with CRC enabled and defaults REG1 to 3.3 V, distinguishing it from I²C or non-CRC variants in the BQ76942 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3-series to 10-series Li-ion/LiFePO₄ stacks - enables direct monitoring of multi-cell battery packs without external multiplexing |
| Cell Voltage Accuracy | ±10 mV (0°C–60°C) - ensures precise state-of-charge estimation and tight voltage-based protection thresholds |
| Coulomb Counter Offset | <1 µV typical input offset - minimizes integration drift during long-term current sensing across sense resistor |
| Current Sense Range | ±200 mV full-scale - supports wide dynamic range of charge/discharge currents with standard shunt resistors |
| DEEPSLEEP Current | 9–10 µA - extends battery pack standby life while retaining fast wake capability via LD or TS2 |
| Communication Interface | SPI with CRC enabled - provides robust, noise-immune host communication suitable for industrial motor control environments |
| REG1 LDO Default | 3.3 V programmable output - powers external microcontrollers or sensors without additional regulators |
| High-Voltage Tolerance | 85 V on PACK, VC10, PCHG, PDSG - accommodates up to 10-cell Li-ion stacks (42 V nominal) with margin for transients |
Pinout & Package
48-pin TQFP package (PFB), 7 mm × 7 mm body size, exposed thermal pad. Pin functions validated per TI SLUSE14B datasheet Rev B (December 2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC0–VC10 | Cell voltage sense inputs | Direct analog inputs for bottom-to-top stack monitoring; VC10 is top-of-stack reference point |
| SRP / SRN | Coulomb counter differential inputs | Accept ±200-mV differential signal across sense resistor for high-precision current integration |
| CHG / DSG | NMOS FET gate drivers | Drive external discharge/charge MOSFETs; logic-level compatible with common N-channel devices |
| PCHG / PDSG | PFET precharge/predischarge drivers | Enable safe inrush current limiting and load pre-discharge using external high-side PFETs |
| REG1 / REG2 | Programmable LDO outputs | Configurable 1.8–5.0 V outputs; REG1 defaults to 3.3 V in BQ7694204PFBR variant |
| TS1–TS3 | Thermistor/ADC inputs | Support up to nine external NTC thermistors (three pins + multifunction pins); enable temperature-aware protection |
| SPI_MOSI / SPI_MISO / SPI_SCLK / SPI_CS | SPI interface signals | Mapped to HDQ, SDA, SCL, CFETOFF respectively - full 4-wire SPI with CRC support |
| ALERT / RST_SHUT | Interrupt and reset control | ALERT asserts on fault conditions; RST_SHUT initiates controlled shutdown or resets device state |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ADC architecture | Enables simultaneous cell voltage and current sampling - eliminates timing skew between SOC and protection decisions |
| Integrated charge pump | Drives high-side NFETs without external bootstrap circuitry - simplifies PCB layout and improves reliability in high-voltage packs |
| Autonomous cell balancing | Performs passive balancing without host intervention - reduces firmware complexity and enables maintenance-free operation |
| OTP memory programmability | Allows customer-specific configuration (e.g., protection thresholds, LDO settings) during production - eliminates post-solder programming steps |
| Random cell attach tolerance | Validates cell connections in any order during manufacturing - increases yield and reduces line downtime |
| Multi-mode power management | Four distinct operating states (NORMAL/SLEEP/DEEPSLEEP/SHUTDOWN) with sub-10 µA quiescent current - extends shelf life and idle runtime |
Applications
| Cordless Power Tools | E-Bikes & E-Scooters |
|---|---|
Use Scenario: High-current, intermittent-load battery packs requiring real-time cell balancing and overtemperature cutoff during aggressive motor bursts. IC Role / Device Role / Timing Role: Primary battery protection and telemetry controller - monitors all cells, enforces voltage/temperature/current limits, and reports status via SPI to MCU. Use Value: Prevents thermal runaway during stall conditions by triggering DSG FET shutdown within 100 µs of overcurrent detection and enabling autonomous balancing to equalize cell aging. | Use Scenario: Mid-drive e-bike systems with 36–48 V Li-ion packs needing accurate SOC estimation and regenerative braking current monitoring. IC Role / Device Role / Timing Role: Stack voltage supervisor and coulomb counter - measures pack voltage (±0.5 V accuracy), integrates bidirectional current (±200 mV range), and communicates via SPI at 400 kHz. Use Value: Delivers <1% SOC drift over 100 cycles using <1 µV ADC offset and factory-trimmed voltage references - extends usable range per charge. |
| Vacuum Cleaners | Non-Military Drones |
Use Scenario: Compact, high-power vacuum platforms with 5–8 series Li-ion cells demanding low-quiescent-current sleep mode and fast wake-on-load-detect. IC Role / Device Role / Timing Role: Load-detect-enabled protector - uses LD pin to detect motor startup and exit DEEPSLEEP (9 µA) within 10 ms to resume full monitoring. Use Value: Achieves >12-month shelf life with no battery drain during storage while maintaining instant readiness - critical for consumer handheld appliances. | Use Scenario: Small UAVs with 3–6 series LiPo packs requiring lightweight, high-reliability protection against overdischarge during rapid descent or GPS loss. IC Role / Device Role / Timing Role: Fault-tolerant safety monitor - performs internal diagnostics (open-wire, ADC self-test) every 5 seconds and asserts ALERT on failure. Use Value: Detects broken cell interconnects before flight via Cell Open Wire Detector - prevents in-air cell reversal and catastrophic failure. |
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 |
|---|---|---|---|
| BQ7694202PFBR | I²C interface (400 kHz), CRC enabled, REG1 defaults to 3.3 V - lacks SPI clock flexibility and deterministic timing of SPI | Preferred where host MCU has limited GPIO but strong I²C infrastructure; less suitable for noise-prone motor control environments | Select when system already uses I²C for other peripherals and board layout constraints limit routing of four SPI lines |
| BQ7695204PFBR | Next-generation pin-compatible upgrade with enhanced diagnostics, higher voltage rating (100 V), and improved ADC linearity (±2 mV cell voltage error) | Targets new designs requiring longer lifetime, tighter SOC accuracy, or compatibility with emerging 12S Li-ion architectures | Choose for new product development where extended lifecycle, AEC-Q200 alignment, and future-proof voltage headroom are required |
Compared with BQ7694202PFBR, the BQ7694204PFBR offers deterministic SPI timing and reduced electromagnetic susceptibility; compared with BQ7695204PFBR, it provides cost-optimized legacy support with identical footprint and software compatibility but lower voltage margin and diagnostic depth.
Availability
BQ7694204PFBR is available at Aetrix Electronics and suitable for cordless power tools, e-bikes, and industrial vacuum cleaners requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for BQ7694204PFBR 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 decades of leadership in battery management solutions.
The BQ76942 product line delivers highly integrated, high-accuracy monitoring and protection for multi-cell lithium-based battery packs - designed specifically for industrial, portable, and light electric vehicle applications demanding reliability, precision, and low-power operation.
FAQ
What communication interface does the BQ7694204PFBR use, and how is it configured?
The BQ7694204PFBR uses a 400-kHz SPI interface with CRC enabled by default. Unlike I²C variants, it maps SPI signals to HDQ (MOSI), SDA (MISO), SCL (SCLK), and CFETOFF (CS) pins. This configuration provides deterministic timing, higher noise immunity, and faster command throughput - essential for real-time protection in motor-driven applications. The BQ7694204PFBR does not support I²C or HDQ-only operation.
How does the BQ7694204PFBR handle cell balancing, and what is its maximum balancing current?
The BQ7694204PFBR supports both autonomous and host-controlled passive cell balancing through dedicated VCx pins. It delivers up to 100 mA balancing current per cell using internal switches and external resistors. Balancing is triggered by voltage differentials exceeding user-defined thresholds and operates independently in SLEEP mode - ensuring continuous equalization without host intervention or increased system power consumption.
What are the power modes of the BQ7694204PFBR, and what is its lowest quiescent current?
The BQ7694204PFBR features four power modes: NORMAL (286 µA), SLEEP (24–41 µA), DEEPSLEEP (9–10 µA), and SHUTDOWN (1 µA). Its lowest operational quiescent current is 9 µA in DEEPSLEEP mode, achieved while retaining wake capability via LD or TS2 pins. This enables multi-month battery pack shelf life without compromising fast wake latency (<10 ms) for immediate monitoring upon load detection.
Does the BQ7694204PFBR support external thermistors, and how many can it monitor?
Yes, the BQ7694204PFBR supports temperature sensing using its internal sensor plus up to nine external NTC thermistors. Dedicated TS1–TS3 pins handle three channels, while five additional multifunction pins (ALERT, HDQ, CFETOFF, DFETOFF, DCHG) can be configured as thermistor inputs. All inputs share the same 1.8-V reference (REG18) and are scanned by the general-purpose ADC - enabling comprehensive thermal mapping across large battery modules.
What protection functions are integrated into the BQ7694204PFBR, and how are they implemented?
The BQ7694204PFBR integrates voltage (over/under-cell, over/under-pack), temperature (cell, ambient, FET), current (charge/discharge overcurrent, short-circuit), and internal diagnostics (open-wire, ADC fault, LDO failure). Protections are enforced via dedicated comparator-based hardware circuits with programmable delays and latching behavior. Critical responses - such as CHG/DSG FET shutdown - occur within 100 µs of threshold violation, independent of host communication or firmware execution.
BQ7694204PFBR 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:
- LiFePO4/Li-ion
- Number of Cells:
- 3 ~ 10
- Fault Protection:
- Over Current, Over Temperature, Over Voltage, Short Circuit
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP (7x7)
BQ7694204PFBR FAQ
1.How can I place an order for BQ7694204PFBR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7694204PFBR 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 BQ7694204PFBR reliable?
The price and inventory of BQ7694204PFBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7694204PFBR is usually 5 days.
3.What payment methods are accepted for BQ7694204PFBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7694204PFBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7694204PFBR?
BQ7694204PFBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7694204PFBR 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 BQ7694204PFBR?
For technical support, including BQ7694204PFBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7694204PFBR requirements.
6.How does Aetrix verify that BQ7694204PFBR is sourced from the original manufacturer or authorized distributors?
All BQ7694204PFBR 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 BQ7694204PFBR meets industry standards.
7.What is the process for return or replacement of BQ7694204PFBR?
All BQ7694204PFBR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7694204PFBR, 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 BQ7694204PFBR part is unused and in its original packaging.
Return procedure for BQ7694204PFBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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