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Texas Instruments BQ79758QPAPRQ1
- Part No.:
- BQ79758QPAPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 64-PowerTQFP
- Datasheet:
-
BQ79758QPAPRQ1.pdf
- Description:
- 18S AUTOMOTIVE BATTERY MONITOR &
- Quantity:
- Payment:
- Shipping:
Inventory:910
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Product details
Overview
BQ79758QPAPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) functional safety-compliant automotive battery monitor IC for up to 18-series lithium-ion cells, featuring ±1 mV typical cell voltage accuracy, dual ±0.1% gain error drift current sense ADCs, and integrated 300 mA cell balancing. It enables high-voltage BMS in xEV powertrains with daisy-chain ring architecture and limp-home redundancy.
For engineers reviewing the BQ79758QPAPRQ1 datasheet, BQ79758QPAPRQ1 pinout, BQ79758QPAPRQ1 application, or BQ79758QPAPRQ1 equivalent, key selection criteria include ASIL D hardware capability, stackable 18S monitoring, isolated daisy-chain communication, low-power mode (<6 μA), and compatibility with BQ79600-Q1 SPI/UART interface for system-level integration.
Technical Context
The BQ79758QPAPRQ1 implements a dedicated high-accuracy SAR ADC for cell voltage measurement and two independent sigma-delta current sense ADCs with ±275 mV input range and programmable overcurrent comparators. Its measurement architecture meets ISO 26262 requirements for systematic and hardware ASIL D compliance.
Daisy-chain isolation uses transformer or capacitor coupling, enabling centralized or distributed xEV BMS topologies. The device supports full-redundancy limp-home mode, hardware reset simulating POR without battery removal, and on-chip one-time programmable memory for custom calibration or configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 18-series per device; up to 64 devices stackable for >1000-cell systems |
| Cell Voltage Accuracy | ±1 mV typical - enables precise state-of-charge estimation within <0.5% SOC error margin |
| Current Sense ADC Gain Error Drift | ±0.1% - maintains shunt-based current measurement integrity across temperature and lifetime |
| Operating Temperature Range | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood automotive deployment |
| Low-Power Mode Current | <6 μA - extends standby runtime in parked vehicle battery monitoring scenarios |
| Functional Safety Rating | Hardware ASIL D and Systematic ASIL D - fulfills highest automotive safety integrity level for BMS critical functions |
| Communication Interface | Isolated daisy-chain with ring architecture support - eliminates single-point failure in multi-module systems |
Pinout & Package
Package: HTQFP-64 (PAP), 10.0 mm × 10.0 mm body, 1.2 mm max height, exposed thermal pad requiring PCB soldering for thermal and mechanical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMHP / COMHN | High-side cell string reference | Provides isolated common-mode voltage reference for upper cell stack measurements |
| COMLP / COMLN | Low-side cell string reference | Provides isolated common-mode voltage reference for lower cell stack measurements |
| LINK+ / LINK− | Daisy-chain differential interface | Enables galvanically isolated serial communication between stacked BQ79758QPAPRQ1 devices |
| GPIO0–GPIO9 | Configurable general-purpose I/O | Supports NTC/PTC thermistor inputs, digital sensing, or SPI/I²C controller functions |
| VDD / VSS | Supply and ground | Power domain for internal logic and analog circuitry; requires local decoupling per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated cell balancing | 300 mA continuous balancing current with user-adjustable PWM control and automatic thermal pause/resume |
| Post-ADC digital filtering | Configurable low-pass filters reduce noise in cell voltage and current measurements without external components |
| Busbar measurement support | Accurate current sensing maintained even when busbar routing overlaps sensitive analog traces |
| Hardware reset function | Host-triggered reset emulates power-on reset behavior without physical battery disconnect - critical for field diagnostics |
| One-time programmable memory | On-chip nonvolatile storage for device-specific calibration data or safety-critical configuration parameters |
Applications
| xEV Powertrain BMS | High-Voltage Energy Storage |
|---|---|
|
Use Scenario: Monitoring 18S Li-ion modules in traction battery packs of battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). IC Role / Device Role / Timing Role: Primary cell voltage and current monitor with ASIL D functional safety compliance for real-time SOC/SOH calculation and fault detection. Use Value: Enables safe, reliable operation under harsh automotive conditions while supporting limp-home mode during partial failure. |
Use Scenario: Centralized monitoring of large-format 18S battery modules in grid-scale energy storage systems (ESS) with redundant communication paths. IC Role / Device Role / Timing Role: High-accuracy, stackable battery monitor providing synchronized voltage/current sampling across distributed racks. Use Value: Ring architecture ensures continued operation after single-node failure, improving system uptime and maintenance predictability. |
| Redundant Distributed BMS | Automotive 12V Auxiliary Battery Monitoring |
|
Use Scenario: Distributed BMS nodes in modular battery packs where each node monitors 18 cells and communicates via isolated daisy chain. IC Role / Device Role / Timing Role: Independent monitoring node with full redundancy, including dual current sense ADCs and hardware reset capability. Use Value: Eliminates single points of failure in safety-critical applications through architectural and functional redundancy. |
Use Scenario: Monitoring auxiliary 12V battery health in xEV platforms where main traction battery powers 12V DC-DC converter. IC Role / Device Role / Timing Role: Secondary BMS monitor for backup power integrity, leveraging same software/hardware reuse as main pack due to pin-to-pin compatibility. Use Value: Reduces development cost and validation effort by reusing firmware and PCB layout across primary and auxiliary monitoring subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ79752QPAPRQ1 | 14-cell variant in identical HTQFP-64 package; shares same ASIL D qualification, daisy-chain architecture, and current sense specs | Targeted at smaller battery modules (e.g., 14S hybrid starter batteries); not suitable for full 18S traction packs | Select when module cell count is ≤14 and layout/software reuse is prioritized over maximum channel count |
| BQ79616QPAPRQ1 | 16-cell monitor with identical pinout and functional safety documentation; differs in ADC resolution (16-bit vs. BQ79758QPAPRQ1's 18-bit cell voltage ADC) | Used in mid-tier EV platforms requiring balance of accuracy and cost; lacks BQ79758QPAPRQ1's ±1 mV voltage accuracy | Choose for cost-sensitive designs where ±2 mV cell voltage tolerance is acceptable and 16S coverage suffices |
Compared with BQ79758QPAPRQ1, the BQ79752QPAPRQ1 reduces channel count but retains full ASIL D compliance and layout compatibility, while the BQ79616QPAPRQ1 trades 2-bit ADC resolution for broader industry adoption and slightly lower unit cost - both require no PCB redesign but differ in measurable accuracy and scalability.
Availability
BQ79758QPAPRQ1 is available at Aetrix Electronics and suitable for xEV powertrain BMS, high-voltage energy storage systems, and redundant distributed battery monitoring requiring stable component supply, long-term automotive lifecycle support, and functional safety certification traceability.
Supply support for BQ79758QPAPRQ1 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 delivering analog and embedded processing solutions, with leadership in automotive, industrial, and power management technologies.
The BQ79758QPAPRQ1 belongs to TI's BQ7975x-Q1 family of precision automotive battery monitors, designed specifically for ASIL D-compliant, high-accuracy, stackable BMS in xEV and HEV powertrain applications.
FAQ
What is the functional safety certification status of the BQ79758QPAPRQ1?
The BQ79758QPAPRQ1 is AEC-Q100 Grade 1 qualified and fully compliant with ISO 26262 up to ASIL D for both systematic and hardware elements. TI provides a Functional Safety Manual, Safety Analysis Report Summary, and full Functional Safety Report to support system-level certification efforts for the BQ79758QPAPRQ1.
Does the BQ79758QPAPRQ1 support daisy-chain communication with ring architecture?
Yes, the BQ79758QPAPRQ1 supports robust isolated daisy-chain communication using LINK+/LINK− differential pairs and explicitly includes ring architecture support to maintain communication integrity if a single device fails or is disconnected in the chain - a key requirement for automotive BMS redundancy.
What is the cell voltage measurement accuracy of the BQ79758QPAPRQ1, and how is it achieved?
The BQ79758QPAPRQ1 achieves ±1 mV typical cell voltage accuracy using a dedicated high-precision SAR ADC architecture with integrated post-ADC digital low-pass filtering. This accuracy is maintained across temperature and lifetime, enabling sub-0.5% state-of-charge estimation errors in production BQ79758QPAPRQ1 deployments.
Can the BQ79758QPAPRQ1 perform current sensing without degrading cell voltage measurement accuracy?
Yes, the BQ79758QPAPRQ1 features two independent current sense ADCs with ±0.1% gain error drift and ±275 mV input range, decoupled from the cell voltage measurement path. Its design supports busbar routing without affecting voltage accuracy - verified in TI's reference layouts and system-level test reports for the BQ79758QPAPRQ1.
Is the BQ79758QPAPRQ1 pin-compatible with other devices in the BQ7975x-Q1 family?
Yes, the BQ79758QPAPRQ1 uses the same HTQFP-64 (PAP) package and pinout as other members of the BQ7975x-Q1 family, including the BQ79752QPAPRQ1 (14S) and BQ79756QPAPRQ1 (16S), enabling hardware reuse and software portability across different cell-count configurations in the BQ79758QPAPRQ1 platform.
BQ79758QPAPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 9 ~ 18
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- I2C, SPI, UART
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-HTQFP (10x10)
BQ79758QPAPRQ1 FAQ
1.How can I place an order for BQ79758QPAPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ79758QPAPRQ1 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 BQ79758QPAPRQ1 reliable?
The price and inventory of BQ79758QPAPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ79758QPAPRQ1 is usually 5 days.
3.What payment methods are accepted for BQ79758QPAPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ79758QPAPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ79758QPAPRQ1?
BQ79758QPAPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ79758QPAPRQ1 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 BQ79758QPAPRQ1?
For technical support, including BQ79758QPAPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ79758QPAPRQ1 requirements.
6.How does Aetrix verify that BQ79758QPAPRQ1 is sourced from the original manufacturer or authorized distributors?
All BQ79758QPAPRQ1 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 BQ79758QPAPRQ1 meets industry standards.
7.What is the process for return or replacement of BQ79758QPAPRQ1?
All BQ79758QPAPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ79758QPAPRQ1, 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 BQ79758QPAPRQ1 part is unused and in its original packaging.
Return procedure for BQ79758QPAPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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