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Texas Instruments BQ79606APHPTQ1
- Part No.:
- BQ79606APHPTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-PowerTQFP
- Datasheet:
-
BQ79606APHPTQ1.pdf
- Description:
- IC BATT MON LI-ION 3-6CL 48HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
BQ79606APHPTQ1 from Texas Instruments is a SafeTI™-ASIL-D compliant automotive-grade battery monitor IC for 3–6 series Li-ion cells, delivering ±1.1 mV cell voltage accuracy, integrated hardware overvoltage/undervoltage and overtemperature/undertemperature protection, and isolated daisy-chain communication supporting up to 384-series-cell stacks in electrified vehicle battery packs.
For engineers reviewing the BQ79606APHPTQ1 datasheet, BQ79606APHPTQ1 pinout, BQ79606APHPTQ1 application, or BQ79606APHPTQ1 equivalent, key selection considerations include its AEC-Q100 Grade 2 qualification (–40°C to +105°C), simultaneous delta-sigma ADC per cell, configurable SINC3 digital filter (as low as 1.2 Hz), integrated 150 mA cell-balancing MOSFETs, and dual-interface support (UART host + isolated differential daisy chain).
Technical Context
The BQ79606APHPTQ1 implements six independent delta-sigma ADCs - one per cell input - enabling true simultaneous voltage measurement across all monitored cells in under 1 ms for full 96-cell stacks. Its analog front-end integrates high-voltage filtering components and supports hot-plug robustness with built-in ESD protection (HBM ±2 kV, CDM ±500 V).
It features two isolated communication paths: a UART interface for direct host connection and a capacitive or transformer-isolated differential daisy-chain bus supporting optional ring architecture for fault-tolerant stack communication. The device includes dedicated hardware protector logic (ASIL-B) with independent thresholds for cell OV/UV and OT/UT, decoupled from firmware control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count | Monitors 3–6 series-connected Li-ion cells; enables scalable pack monitoring via daisy-chain stacking. |
| Voltage accuracy | ±1.1 mV offset error over –40°C to +105°C; ensures precise state-of-charge and cell balancing decisions. |
| ADC type | Delta-sigma per cell with configurable SINC3 digital filter (1.2 Hz to 1 kHz cutoff); suppresses switching noise in noisy automotive environments. |
| Cell balancing | Integrated MOSFETs support up to 150 mA per channel; eliminates need for external FETs and reduces BOM count. |
| Communication | Dual interfaces: UART (host-side) + isolated differential daisy chain (capacitor or transformer coupled); ring topology option maintains link integrity after cable break. |
| Safety compliance | SafeTI™-ASIL-D for monitoring functions; ASIL-B for hardware protector; AEC-Q100 Grade 2 qualified (–40°C to +105°C ambient). |
| Supply range | VBAT/LDOIN: 5.5 V to 30 V; supports 12-V, 48-V, and high-voltage traction battery modules without external regulators. |
Pinout & Package
Package: 48-pin PQFP (7.00 mm × 7.00 mm), thermally enhanced for automotive under-hood operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC0–VC6 | Cell voltage sense inputs | Differential inputs for 6-cell stack; VC0 connects to bottom cell negative, VC6 to top cell positive - defines full-stack common-mode range. |
| CB0–CB6 | Cell balance FET outputs | Drain terminals of internal balancing MOSFETs; each connects to cell junctions to enable passive balancing up to 150 mA. |
| COMHP/COMHN, COMLP/COMLN | Daisy-chain transceiver I/O | AC-coupled differential pair for isolated inter-device communication; supports transformer or capacitor isolation with optional ring topology. |
| FAULTHP/FAULTHN, FAULTLP/FAULTLN | Daisy-chain fault signaling | Dedicated differential fault bus; propagates hardware protector events (OV/UV/OT/UT) across stack without host intervention. |
| NFAULT | Active-low system fault output | Open-drain indicator asserting on any critical fault (e.g., REF1 UV/OV, thermal shutdown); pulls low to alert host MCU immediately. |
| TX/RX | UART host interface | Asynchronous serial interface for configuration, calibration, and diagnostics; operates at system VIO (1.8 V–5.25 V). |
| GPIO1–GPIO6 | Configurable I/O/ADC inputs | Support NTC temperature sensing (ratiometric to TSREF), external voltage monitoring, or programmable address setting in multi-drop systems. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous cell measurement | Full 6-cell conversion in <1 ms using per-cell delta-sigma ADCs - eliminates timing skew between cells for accurate SoC estimation. |
| Integrated hardware protector | Dedicated analog comparator circuitry triggers immediate cell OV/UV and OT/UT shutdown independent of firmware - meets ASIL-B requirements. |
| Isolated daisy-chain ring architecture | Enables bidirectional communication even after single-point cable failure - ensures diagnostic continuity in safety-critical EV battery systems. |
| Hot-plug robustness | Designed to withstand transient surges during live battery module insertion; passes BCI testing per ISO 11452-4. |
| Stack scalability | Up to 64 devices (384 cells) in daisy chain; base + 63 stack configuration supports full traction battery monitoring without gateway complexity. |
Applications
| Electric Vehicle Battery Management | 48-V Mild Hybrid Systems |
|---|---|
Use Scenario: Monitoring 96-series Li-ion cells in a full BEV traction battery pack with redundant communication and hardware-level cell protection. IC Role / Device Role / Timing Role: Primary voltage/temperature monitor and hardware protector; performs simultaneous cell voltage acquisition every 100 ms with ASIL-D functional safety compliance. Use Value: Enables precise state-of-charge estimation and autonomous cell-level overvoltage cutoff within 5 µs - preventing thermal runaway without host CPU involvement. | Use Scenario: Supervising 12–16 series cells in a 48-V stop-start battery for mild hybrid vehicles with CAN-based vehicle network integration. IC Role / Device Role / Timing Role: Stack monitor with UART-to-CAN bridge capability; provides cell data to vehicle ECU via isolated daisy chain and local UART debug interface. Use Value: Reduces system latency by eliminating software polling - hardware fault signals propagate across stack in <10 µs, meeting ISO 26262 response time targets. |
| Grid-Scale Energy Storage | Industrial UPS Battery Packs |
Use Scenario: Monitoring large-format LFP cells in stationary energy storage systems requiring long-term reliability and extended temperature operation. IC Role / Device Role / Timing Role: High-accuracy voltage and temperature sensor with integrated 16-bit auxiliary ADC for up to six NTC channels; supports 10-year field life at +65°C ambient. Use Value: ±1.1 mV cell voltage accuracy ensures <0.5% SoH drift over 5,000 cycles - critical for revenue-grade battery analytics and warranty validation. | Use Scenario: Managing 24-series Li-ion cells in mission-critical uninterruptible power supplies where runtime predictability and fail-safe shutdown are mandatory. IC Role / Device Role / Timing Role: Safety-critical monitor with dual-path communication (UART + daisy chain); delivers cell data to backup controller while maintaining watchdog supervision. Use Value: Integrated hardware protector guarantees autonomous cell undervoltage cutoff at 2.5 V/cell - prevents deep discharge damage during extended grid outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ79616-Q1 | Monitors 16 cells per device (vs. 6); same package, pinout, and firmware compatibility; higher integration density but requires fewer daisy-chain nodes. | Better suited for compact high-cell-count modules (e.g., 16S–48S) where board space is constrained and interconnect reliability is prioritized over per-node cost. | Select BQ79616-Q1 when scaling beyond 6S per node improves system-level BOM efficiency and reduces daisy-chain signal path length. |
| MAX17853 | Monitors 14 cells; uses SPI-based daisy chain (not differential); no integrated hardware protector; ASIL-B only; different pinout and register map. | Targeted at non-safety-critical industrial battery systems; lacks automotive qualification and autonomous hardware-level fault response. | Choose MAX17853 only for cost-sensitive, non-automotive applications where functional safety certification is not required and SPI interface suffices. |
Compared with BQ79606APHPTQ1, BQ79616-Q1 offers higher per-device cell count and identical safety architecture but increases per-node cost and thermal load, while MAX17853 lacks ASIL-D compliance, hardware protector, and differential isolation - limiting use to non-automotive designs.
Availability
BQ79606APHPTQ1 is available at Aetrix Electronics and suitable for electric vehicle battery management, 48-V mild hybrid systems, and grid-scale energy storage requiring stable component supply, long-term automotive qualification, and ASIL-D functional safety assurance.
Supply support for BQ79606APHPTQ1 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 automotive electronics, with decades of experience in battery management system innovation.
The BQ796xx-Q1 product line is designed specifically for ASIL-D-compliant automotive battery monitoring, integrating precision analog sensing, hardware-based safety protection, and robust isolated communication for electrified powertrain applications.
FAQ
What is the maximum number of BQ79606APHPTQ1 devices that can be daisy-chained in a single stack?
The BQ79606APHPTQ1 supports up to 64 devices per daisy chain (1 base + 63 stack), enabling monitoring of up to 384 series-connected Li-ion cells. This configuration is validated per TI's SLUSDQ4 datasheet and leverages the device's isolated differential communication interface with optional ring architecture to maintain link integrity across the full stack.
Does the BQ79606APHPTQ1 require external cell balancing MOSFETs?
No, the BQ79606APHPTQ1 integrates six internal MOSFETs capable of delivering up to 150 mA per channel for passive cell balancing. External FETs are not required, reducing bill-of-materials count and PCB area. The CB0–CB6 pins directly drive balancing resistors, with recommended capacitor values specified per channel in the datasheet.
What safety certifications apply to the BQ79606APHPTQ1?
The BQ79606APHPTQ1 is AEC-Q100 Grade 2 qualified (–40°C to +105°C ambient), with HBM ESD level 2 (±2 kV) and CDM level C4B (±500 V). Its monitoring functions comply with ISO 26262 ASIL-D, and its hardware protector logic meets ASIL-B - both certified per TI's SafeTI™ program and documented in the SLUSDQ4 production datasheet.
Can the BQ79606APHPTQ1 operate with only UART communication, without daisy-chain isolation?
Yes, the BQ79606APHPTQ1 supports standalone UART operation for single-device or base-node configurations. The daisy-chain interface (COMH/COML/FAULTH/FAULTL) is optional; if unused, those pins may be left unconnected per datasheet guidance. UART remains fully functional for configuration, diagnostics, and real-time data streaming.
What is the role of the NFAULT pin on the BQ79606APHPTQ1?
The NFAULT pin on the BQ79606APHPTQ1 is an active-low, open-drain fault indicator that asserts immediately upon detection of critical conditions - including REF1 undervoltage/overvoltage, thermal shutdown, or hardware protector events (cell OV/UV/OT/UT). It requires an external pull-up resistor (10 kΩ to 100 kΩ) to VIO and provides sub-10 µs response for system-level safety interlocks.
BQ79606APHPTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Functional Safety (FuSa)
- Package/Case:
- 48-PowerTQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 6
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- SPI, UART
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-HTQFP (7x7)
BQ79606APHPTQ1 FAQ
1.How can I place an order for BQ79606APHPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ79606APHPTQ1 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 BQ79606APHPTQ1 reliable?
The price and inventory of BQ79606APHPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ79606APHPTQ1 is usually 5 days.
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Once your BQ79606APHPTQ1 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 BQ79606APHPTQ1?
For technical support, including BQ79606APHPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ79606APHPTQ1 requirements.
6.How does Aetrix verify that BQ79606APHPTQ1 is sourced from the original manufacturer or authorized distributors?
All BQ79606APHPTQ1 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 BQ79606APHPTQ1 meets industry standards.
7.What is the process for return or replacement of BQ79606APHPTQ1?
All BQ79606APHPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ79606APHPTQ1, 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 BQ79606APHPTQ1 part is unused and in its original packaging.
Return procedure for BQ79606APHPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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