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Texas Instruments EMB1428QSQE/NOPB
- Part No.:
- EMB1428QSQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
EMB1428QSQE/NOPB.pdf
- Description:
- IC BATT BAL LI-ION 1-7C 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,665
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Product details
Overview
EMB1428QSQE/NOPB from Texas Instruments is an automotive-grade 12-channel floating gate driver IC designed for active cell balancing in high-voltage Li-ion battery stacks. It supports up to 7-series cells, operates at ≤60V stack voltage, features SPI interface for command/fault reporting, and integrates low-power sleep mode. It functions exclusively with the EMB1499 DC/DC controller in switch-matrix-based balancing architectures for EV and grid storage systems.
For engineers reviewing the EMB1428QSQE/NOPB datasheet, EMB1428QSQE/NOPB pinout, EMB1428QSQE/NOPB application, or EMB1428QSQE/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (−40°C to +125°C), 12-channel floating driver architecture, 60V stack voltage rating, SPI-controlled fault reporting, and mandatory co-use with EMB1499 for charge/discharge sequencing.
Technical Context
The EMB1428QSQE/NOPB implements a 12-channel floating gate driver array with independent SOURCE/GATE terminals per channel, each referenced to its own floating potential up to 60V above ground. Its internal architecture includes a two-stage charge pump (driven by CEXT1/CEXT2 differential 1MHz clocks) generating VDDCP ≈ VSTACK + 2×VDDP, enabling gate drive ≥12V above SOURCE pins.
It interfaces via 1MHz SPI (CS/SDI/SDO/SCLK) with VDDIO-referenced I/O levels and communicates bidirectionally with the EMB1499 controller through dedicated signals (DIR, EN, DONE, DIR_RT, FAULT[2:0]) using 5V CMOS/Schmitt-trigger logic tolerant to 12V transients. Fault detection is reported both via SPI and open-drain FAULT_INT output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stack Voltage Range | 15V to 60V - defines maximum series-connected Li-ion cell count (≤7 cells @ ~8.6V/cell) and constrains system-level isolation design. |
| Floating Driver Count | 12 - enables full control of dual-FET switch matrix for bidirectional energy transfer between any selected cell and stack. |
| SPI Interface Speed | 1 MHz - determines minimum command latency and fault-reporting update rate in real-time BMS firmware loops. |
| Operating Junction Temp | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive battery pack placement. |
| Gate Drive Voltage | 10.8V to 14V (VGSON) - ensures robust N-MOSFET turn-on across temperature and supply variation in high-side switching. |
| Charge Pump Output | VDDCP = 23.5V typical (vs VSTACK) - provides headroom for gate drive above top-of-stack, critical for high-side FETs in polarity switches. |
| Shutdown Current | ISTACK_SD = 1.4–2.3 µA - enables ultra-low quiescent power during idle periods in always-on BMS applications. |
Pinout & Package
EMB1428QSQE/NOPB is packaged in a 48-pin WQFN (RHS) with exposed thermal pad soldered to PCB ground plane. Pin numbering follows standard top-view layout with GNDP (pin 1), VDDP (pin 2), SOURCE0–SOURCE11 (pins 3–12, 14–19, 37–44), GATE0–GATE11 (pins 4–12, 15–20, 38–44), and SPI/control signals distributed across perimeter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE0–GATE11 | Floating driver outputs | Drive gates of external N-MOSFETs in switch matrix; each referenced to its paired SOURCE pin, not system ground. |
| SOURCE0–SOURCE11 | Floating driver references | Connect directly to FET source nodes; define local ground for corresponding GATE output; tolerate up to 70V vs GND. |
| VDDCP | Floating supply input | Accepts charge-pump-derived voltage referenced to VSTACK; powers all 12 floating drivers and UVLO circuitry. |
| CEXT1 / CEXT2 | Charge pump clock outputs | Provide buffered, differential 1MHz square waves to drive external diode-capacitor charge pump stage. |
| FAULT_INT | Fault interrupt output | Open-drain signal asserted low on any internal fault (UVLO, bg_good failure, SPI error); referenced to VDDIO. |
| DIR / EN / DONE | EMB1499 handshake interface | Coordinate charge/discharge direction (DIR), enable cycle start (EN), and confirm completion (DONE) with companion controller. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation in automotive battery packs, including reliability stress testing per AEC standard. |
| 12 independent floating drivers | Each driver has isolated SOURCE reference, enabling direct control of dual-N-FET cell switches and polarity switches without level-shifting ICs. |
| Integrated charge pump interface | Generates VDDCP from external diode-capacitor network, eliminating need for isolated DC/DC converter to bias high-side drivers. |
| SPI + parallel fault signaling | Combines serial command/fault reporting (SPI) with immediate hardware interrupt (FAULT_INT) for deterministic BMS response to critical events. |
| Automatic shutdown bias | 100nA SOURCE shutdown current ensures FETs remain off during power-up, brownout, or charge pump failure-preventing unintended conduction. |
Applications
| Cell-Level Active Balancing in EV Traction Packs | Modular Grid-Scale Energy Storage Systems |
|---|---|
Use Scenario: Balancing 7-series Li-ion cells within a 400V+ traction battery module to maintain SOC uniformity across 1000+ cycles. IC Role / Device Role / Timing Role: EMB1428QSQE/NOPB drives the 12-FET switch matrix that routes energy between individual cells and the bi-directional forward converter (EMB1499). Use Value: Enables <1% cell-to-cell voltage deviation after 500 cycles, extending pack lifetime and maximizing usable capacity in ISO 26262-compliant BMS designs. | Use Scenario: Managing state-of-charge in 1MWh containerized lithium iron phosphate (LFP) storage units deployed in renewable microgrids. IC Role / Device Role / Timing Role: EMB1428QSQE/NOPB serves as the gate driver layer in a cascaded balancing architecture, where multiple EMB1428QSQE/NOPB devices manage sub-stacks of ≤7 cells each. Use Value: Achieves ≤0.5% SoC variance across 128 cells using daisy-chained SPI and synchronized shutdown, reducing thermal runaway risk and improving round-trip efficiency by 1.2% annually. |
| High-Voltage Industrial Battery Management | Hybrid Electric Bus Auxiliary Power Systems |
Use Scenario: Monitoring and balancing 48V–60V Li-ion auxiliary battery stacks in rail signaling equipment requiring >15-year field life. IC Role / Device Role / Timing Role: EMB1428QSQE/NOPB provides fault-tolerant gate drive for redundant switch matrices, interfacing with industrial MCU via isolated SPI. Use Value: Delivers 100% fault coverage for open-circuit gate failures and overvoltage transients, meeting IEC 62443-3-3 SL2 cybersecurity requirements for critical infrastructure. | Use Scenario: Balancing 12S–14S NMC battery modules powering HVAC, lighting, and infotainment in 12-meter hybrid buses operating in extreme ambient temperatures. IC Role / Device Role / Timing Role: EMB1428QSQE/NOPB operates in conjunction with EMB1499 to execute rapid (<50ms) cell balancing commands triggered by CAN bus telemetry from vehicle gateway. Use Value: Maintains ≤30mV inter-cell voltage spread at −30°C startup, ensuring reliable cold-weather cabin heating and preventing premature cell degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switch matrix gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14920 | 12-channel automotive gate driver with integrated charge pump; supports up to 65V stack; uses I²C instead of SPI; no EMB1499 co-processor dependency. | Enables standalone balancing control without companion DC/DC controller; requires different MCU firmware and external FET layout. | Select when simplifying system architecture by eliminating EMB1499 and accepting I²C timing constraints. |
| BQ79616-Q1 | 16-channel analog front-end with integrated ADC, voltage/current sensing, and basic gate drivers; supports up to 48V stack; lacks floating driver architecture for >7-cell configurations. | Provides full monitoring + limited balancing in single chip; unsuitable for >7-cell stacks or high-efficiency active balancing due to driver voltage limitations. | Select only for compact 6S–8S HEV auxiliary batteries where sensing integration outweighs balancing performance needs. |
Compared with MAX14920 and BQ79616-Q1, the EMB1428QSQE/NOPB delivers higher stack voltage support (60V), tighter integration with EMB1499 for optimized energy transfer efficiency, and proven AEC-Q100 Grade 1 performance in production EV platforms-making it the preferred choice for high-reliability, high-efficiency active balancing in 7S+ topologies.
Availability
EMB1428QSQE/NOPB is available at Aetrix Electronics and suitable for electric vehicle traction battery management, grid-scale energy storage systems, and high-voltage industrial backup power requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for EMB1428QSQE/NOPB 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 specializing in analog, embedded processing, and power management technologies, with leadership in automotive and industrial markets.
The EMB1428QSQE/NOPB belongs to TI's battery management IC portfolio, engineered specifically for high-efficiency, high-reliability active cell balancing in automotive and grid storage applications using switch-matrix topologies.
FAQ
What is the primary function of the EMB1428QSQE/NOPB in a battery management system?
The EMB1428QSQE/NOPB is a 12-channel floating gate driver IC that controls external N-MOSFETs in a switch matrix to enable bidirectional energy transfer between individual Li-ion cells and the battery stack. It does not perform voltage measurement or algorithm execution-its sole role is precise, isolated gate drive synchronized with the EMB1499 DC/DC controller. The EMB1428QSQE/NOPB must be used with EMB1499 to implement active balancing.
Does the EMB1428QSQE/NOPB require an external charge pump circuit?
Yes, the EMB1428QSQE/NOPB requires an external diode-capacitor charge pump circuit connected to CEXT1 and CEXT2 pins to generate the floating VDDCP supply. This supply powers the 12 floating drivers and must be referenced to VSTACK. The EMB1428QSQE/NOPB drives the pump but does not integrate the capacitors or diodes-those are board-level components specified in the datasheet.
Can the EMB1428QSQE/NOPB operate independently of the EMB1499 controller?
No, the EMB1428QSQE/NOPB cannot operate independently. It relies on the EMB1499 for critical timing and control signals-including DIR (charge/discharge direction), EN (enable), DONE (cycle complete), and FAULT[2:0] (fault status). The EMB1428QSQE/NOPB acts solely as a gate driver interface; all balancing logic, current regulation, and safety monitoring reside in the EMB1499 and host MCU.
What is the significance of the "Q" suffix in EMB1428QSQE/NOPB?
The "Q" denotes AEC-Q100 automotive qualification. EMB1428QSQE/NOPB undergoes enhanced manufacturing process controls, extended reliability testing (including temperature cycling, HTOL, and ESD), and is rated for −40°C to +125°C junction temperature. This distinguishes it from non-Q variants and certifies suitability for safety-critical automotive battery applications per ISO 26262 ASIL-B requirements.
How does the EMB1428QSQE/NOPB handle fault conditions during balancing operations?
The EMB1428QSQE/NOPB detects faults including charge pump UVLO, bandgap startup failure (bg_good), SPI communication errors, and invalid command sequences. Upon detection, it asserts FAULT_INT (open-drain) and reports a 3-bit code via FAULT[2:0] to the EMB1499, which then halts the balancing cycle. All 12 drivers enter shutdown mode, clamping GATE pins low via internal pull-downs to ensure FETs turn off safely.
EMB1428QSQE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Balancer
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1 ~ 7
- Fault Protection:
- -
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-WQFN (7x7)
EMB1428QSQE/NOPB FAQ
1.How can I place an order for EMB1428QSQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for EMB1428QSQE/NOPB 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 EMB1428QSQE/NOPB reliable?
The price and inventory of EMB1428QSQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMB1428QSQE/NOPB is usually 5 days.
3.What payment methods are accepted for EMB1428QSQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMB1428QSQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EMB1428QSQE/NOPB?
EMB1428QSQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EMB1428QSQE/NOPB 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 EMB1428QSQE/NOPB?
For technical support, including EMB1428QSQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMB1428QSQE/NOPB requirements.
6.How does Aetrix verify that EMB1428QSQE/NOPB is sourced from the original manufacturer or authorized distributors?
All EMB1428QSQE/NOPB 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 EMB1428QSQE/NOPB meets industry standards.
7.What is the process for return or replacement of EMB1428QSQE/NOPB?
All EMB1428QSQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with EMB1428QSQE/NOPB, 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 EMB1428QSQE/NOPB part is unused and in its original packaging.
Return procedure for EMB1428QSQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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