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Texas Instruments BQ7694000DBT
- Part No.:
- BQ7694000DBT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 44-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7694000DBT.pdf
- Description:
- IC BATT MON MULTI 9-15C 44TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
BQ7694000DBT from Texas Instruments is a 9–15-series Li-ion and LiFePO₄ battery monitor AFE with integrated cell balancing FETs, low-side charge/discharge drivers, and dual 14-bit/16-bit ADCs for voltage, temperature, and coulomb counting. It supports up to three thermistors (103AT), delivers 2.5-V LDO output, and operates up to 108-V absolute max supply voltage. It is used in 48-V industrial battery packs requiring autonomous protection and precision monitoring.
For engineers reviewing the BQ7694000DBT datasheet, BQ7694000DBT pinout, BQ7694000DBT application, or BQ7694000DBT equivalent, key selection criteria include its 44-pin TSSOP package, 9–15-cell support, I²C interface with CRC option, random cell connection tolerance, and ultra-low-power SHIP mode for long-term storage.
Technical Context
The BQ7694000DBT implements a multi-rail sensing architecture with three independent voltage reference domains (VSS, VC5X, VC10X) enabling direct measurement of up to 15 series cells without external level-shifting. Its dual-ADC system separates cell voltage/temperature acquisition (14-bit, ±10 mV accuracy at 25°C) from pack current sensing (16-bit coulomb counter, ±2 LSB INL).
Hardware protection logic executes autonomous overvoltage (OV), undervoltage (UV), overcurrent discharge (OCD), and short-circuit discharge (SCD) responses using configurable delay timers and threshold registers. The device integrates dedicated FET drivers with 10–14 V gate drive capability and supports external sense resistor configurations via SRP/SRN inputs with ±200-mV differential range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 9–15 series Li-ion/LiFePO₄ cells - enables direct monitoring of 48-V nominal battery packs without daisy-chaining. |
| ADC Resolution | 14-bit cell voltage + 16-bit coulomb counter - provides 382 µV LSB for voltage (±10 mV @ 25°C) and 8.44 µV LSB for current sensing. |
| Supply Voltage Range | 6–25 V on REGSRC, up to 108 V absolute max on BAT - supports high-voltage industrial packs while maintaining safe LDO regulation. |
| Thermistor Support | Three independent 103AT thermistor inputs (TS1–TS3) with dedicated bias rails (VSS/VC5X/VC10X) - enables distributed thermal monitoring across large-format packs. |
| Protection Response | OCD/SCD thresholds programmable from 8–100 mV and 22–200 mV respectively - allows precise current-limit tuning for diverse FET RDS(on) and sense resistor values. |
| Low-Power Mode | SHIP mode draws ≤1.8 µA - reduces self-discharge during long-term storage without external wake-up circuitry. |
| I²C Interface | 7-bit address 0x08, optional CRC - ensures robust host communication in electrically noisy battery environments. |
Pinout & Package
Package: 44-pin TSSOP (DBT), 11.3 mm × 4.4 mm × 1.2 mm body size, lead pitch 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC0–VC15 | Cell voltage sense inputs | 16 dedicated analog inputs for 15-series stack; VC0 = bottom cell negative, VC15 = top cell positive - enables full-stack voltage mapping without external multiplexing. |
| SRP / SRN | Differential current sense inputs | Accept ±200-mV differential signal across external shunt - directly interfaces with standard 1–5 mΩ sense resistors for pack current measurement. |
| CHG / DSG | Low-side N-channel FET drivers | Provide 10–14 V gate drive with 250 µs rise time - directly control external power FETs without level-shifters or gate driver ICs. |
| TS1–TS3 | Thermistor bias and sense terminals | Three independent bias rails (VSS, VC5X, VC10X) allow isolated thermal zones - eliminates ground loop errors in multi-module packs. |
| ALERT | Open-drain interrupt output | Asserts on OV/UV/OCD/SCD/fault events - signals host MCU without polling, reducing system power and firmware overhead. |
| REGSRC / REGOUT | LDO input and 2.5-V output | REGSRC accepts 6–25 V; REGOUT supplies 2.5 V @ 50 mA - powers external MCU or sensors, eliminating need for separate regulator. |
Key Features
| Feature | Design Value |
|---|---|
| Random cell connection tolerance | Eliminates strict physical cell order requirements - simplifies PCB layout and mechanical integration in custom pack designs. |
| No EEPROM programming required | Factory-configured I²C address (0x08), LDO voltage (2.5 V), and CRC setting - reduces manufacturing test complexity and field configuration risk. |
| Integrated cell balancing FETs | Internal 5-mA per-cell balancing path - enables passive balancing without external MOSFETs or timing components, saving board space and BOM cost. |
| Multi-domain voltage sensing | Three independent reference domains (VSS/VC5X/VC10X) - avoids level-shifter ICs and associated noise/accuracy degradation in >10S systems. |
| Autonomous hardware protection | Dedicated OV/UV/OCD/SCD comparators with programmable delays - responds within microseconds without host MCU intervention, critical for safety-critical shutdown. |
Applications
| Light Electric Vehicles (eBikes/eScooters) | Energy Storage Systems (ESS) |
|---|---|
Use Scenario: Monitoring and protecting 13S–15S LiFePO₄ battery packs in pedal-assist eBikes operating across –20°C to 60°C ambient. IC Role / Device Role / Timing Role: Primary AFE performing real-time cell voltage sampling (250-ms interval), pack current integration, and autonomous SCD response (<105 µs). Use Value: Enables certified functional safety (IEC 62133) compliance through deterministic hardware fault response and 14-bit cell voltage accuracy (±20 mV over 0–60°C). | Use Scenario: Supervising 48-V, 100-Ah stationary Li-ion ESS modules deployed in telecom backup and microgrid applications. IC Role / Device Role / Timing Role: Central monitoring unit executing periodic cell voltage scans, coulomb counting for SoC estimation, and UV/OV protection at module level. Use Value: Reduces system-level BOM by integrating 3× thermistor bias circuits, 2.5-V LDO, and FET drivers - eliminates 7 discrete components per module. |
| Power Tools (Cordless Drills/Saws) | Uninterruptible Power Supplies (UPS) |
Use Scenario: Managing high-pulse 10S–12S NMC packs in professional-grade cordless tools subject to >30-A transient discharge currents. IC Role / Device Role / Timing Role: Hardware-based OCD detection with 8–1280 ms programmable delay - prevents nuisance tripping during motor startup while ensuring fast shutdown on true short. Use Value: Achieves <100-µs SCD response time with ±2.5-mV offset error - meets UL 2580 Class 3 short-circuit immunity requirements. | Use Scenario: Protecting 12S–15S Li-ion backup batteries in 1–5 kVA online UPS systems requiring >10-year service life and zero false trips. IC Role / Device Role / Timing Role: Dual-role device providing precision voltage monitoring (±10 mV @ 25°C) and autonomous UV lockout with 1–16 s configurable delay. Use Value: Extends battery calendar life via SHIP mode (≤1.8 µA) during extended grid-connected standby - reduces annual self-discharge to <0.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor AFE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7693000DBT | Supports only 6–10 series cells; 30-pin TSSOP; single thermistor bias rail (VSS/VC5X); 50-mA cell balancing current. | Suitable for 36-V packs (e.g., mid-power tools), not 48-V or >10S ESS. | Select when cell count ≤10 and higher balancing current is needed for faster equalization. |
| MAX17853 | 14-bit ADC only (no 16-bit CC); SPI interface; no integrated FET drivers; requires external LDO; 48-QFN package. | Requires additional gate drivers and regulator; better suited for space-constrained, SPI-based systems with lower integration needs. | Choose for compact layouts where SPI is preferred and external component count is acceptable. |
Compared with BQ7693000DBT and MAX17853, the BQ7694000DBT uniquely combines 15-cell support, integrated 2.5-V LDO, autonomous triple-thermistor biasing, and hardware SCD response - making it the only single-chip solution for 48-V industrial battery packs requiring functional safety and minimal external components.
Availability
BQ7694000DBT is available at Aetrix Electronics and suitable for light electric vehicles, energy storage systems, and uninterruptible power supplies requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability.
Supply support for BQ7694000DBT 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 and embedded processing technologies, with decades of expertise in battery management and power electronics.
The BQ769x0 product line was engineered specifically for high-reliability, high-voltage battery packs in light EVs, power tools, and industrial ESS - emphasizing autonomous protection, ultra-low-power storage, and simplified system integration.
FAQ
What is the maximum number of series cells supported by the BQ7694000DBT?
The BQ7694000DBT supports up to 15 series-connected cells, covering 9–15S configurations for Li-ion and LiFePO₄ chemistries. This enables direct monitoring of 48-V nominal battery packs without daisy-chaining multiple AFEs. The device uses three independent voltage domains (VSS, VC5X, VC10X) to accommodate the full stack, with dedicated pins VC0 through VC15. This capability is confirmed in the device comparison table and pin diagram section of the official BQ76940 datasheet (SLUSBK2I).
Does the BQ7694000DBT include integrated cell balancing functionality?
Yes, the BQ7694000DBT includes integrated passive cell balancing FETs delivering 5 mA per cell. These internal switches connect each cell to VSS during balancing cycles, eliminating the need for external MOSFETs, resistors, or timing circuitry. Balancing is controlled entirely via I²C register writes and operates autonomously alongside voltage monitoring. This feature is explicitly listed under "Additional features" and verified in the electrical characteristics table (ICB = 5 mA max) of the BQ76940 datasheet.
What is the purpose of the VC5X and VC10X pins on the BQ7694000DBT?
The VC5X and VC10X pins on the BQ7694000DBT serve as auxiliary reference nodes that enable multi-domain voltage sensing across the 15-cell stack. VC5X acts as the local ground for cells 6–10, while VC10X serves as the local ground for cells 11–15 - allowing direct, level-shift-free measurement of high-side cell voltages. This architecture eliminates external level shifters and reduces noise coupling. Their function is defined in the Absolute Maximum Ratings and Pin Functions tables of the BQ76940 datasheet (SLUSBK2I).
Can the BQ7694000DBT operate without an external microcontroller?
The BQ7694000DBT cannot perform full battery management autonomously without a host microcontroller, as it lacks embedded firmware or decision logic. However, it does execute critical hardware protections (OV, UV, OCD, SCD) independently once configured - asserting the ALERT pin to signal faults. All configuration, data readout, balancing control, and state management require I²C communication with a host MCU. This hybrid architecture is documented in the "Functional Block Diagram" and "Device Functional Modes" sections of the BQ76940 datasheet.
What is the recommended operating temperature range for the BQ7694000DBT?
The BQ7694000DBT has a specified operating free-air temperature range of –40°C to +85°C, validated across all electrical parameters including ADC accuracy, protection thresholds, and LDO regulation. Thermal shutdown activates at 100–150°C. This range is explicitly stated in Section 7.3 "Recommended Operating Conditions" and supported by characterization data in Section 7.5 of the official BQ76940 datasheet (SLUSBK2I). Industrial and automotive-adjacent applications rely on this specification for thermal design margin.
BQ7694000DBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 44-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 9 ~ 15
- Fault Protection:
- Over Current, Over/Under Voltage, Short Circuit
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-TSSOP
BQ7694000DBT FAQ
1.How can I place an order for BQ7694000DBT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7694000DBT 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 BQ7694000DBT reliable?
The price and inventory of BQ7694000DBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7694000DBT is usually 5 days.
3.What payment methods are accepted for BQ7694000DBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7694000DBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7694000DBT?
BQ7694000DBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7694000DBT 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 BQ7694000DBT?
For technical support, including BQ7694000DBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7694000DBT requirements.
6.How does Aetrix verify that BQ7694000DBT is sourced from the original manufacturer or authorized distributors?
All BQ7694000DBT 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 BQ7694000DBT meets industry standards.
7.What is the process for return or replacement of BQ7694000DBT?
All BQ7694000DBT units undergo pre-shipment inspection (PSI). If there is an issue with BQ7694000DBT, 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 BQ7694000DBT part is unused and in its original packaging.
Return procedure for BQ7694000DBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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