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Texas Instruments EMB1428QSQX/NOPB
- Part No.:
- EMB1428QSQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
EMB1428QSQX/NOPB.pdf
- Description:
- IC BATT BAL LI-ION 1-7C 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
EMB1428QSQX/NOPB from Texas Instruments is a 12-channel floating gate driver IC designed for active cell balancing in high-voltage Li-ion battery stacks up to 60V. It delivers 12V gate drive referenced to floating SOURCE pins, interfaces via 1MHz SPI with fault reporting, and operates across −40°C to +125°C junction temperature. It functions exclusively with the EMB1499 DC/DC controller in automotive-grade switch matrix topologies.
For engineers reviewing the EMB1428QSQX/NOPB datasheet, EMB1428QSQX/NOPB pinout, EMB1428QSQX/NOPB application, or EMB1428QSQX/NOPB equivalent, this page provides verified technical context, validated pin-level design meaning, confirmed AEC-Q100 Grade 1 compliance, and real-world balancing timing behavior per TI SNVS812A.
Technical Context
The EMB1428QSQX/NOPB implements twelve independent floating gate drivers, each with integrated UVLO, slew-latched output buffer, and 100kΩ internal bleeder resistors. Its charge pump generates VDDCP = ~2×VDDP − 3×Vdiode (23.5V typical) referenced to VSTACK, enabling gate drive up to 12V above SOURCE pins at up to 60V stack potential.
It relies on external coordination with the EMB1499: DIR/EN/DONE/FAULT signals manage bidirectional energy transfer timing, while SPI commands (CS/SDI/SDO/SCLK) configure cell selection and report faults. All 12 drivers are synchronized to a 1MHz CEXT1/CEXT2 differential clock, with tEN = 2.4ms driver setup time from DONE to EN rising edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Stack Voltage | 60V - defines absolute upper limit of battery string voltage applied to VSTACK pin; exceeds AEC-Q100 Grade 1 automotive requirement. |
| Floating Gate Drivers | 12 - fully independent, source-referenced outputs (GATE0–GATE11) supporting dual-FET switch matrix control for up to 7 series cells. |
| SPI Interface Speed | 1.0 MHz - fixed-rate synchronous serial interface with CS/SDI/SDO/SCLK; supports command delivery and 3-bit fault code reporting. |
| Junction Temp Range | −40°C to +125°C - validated operating range per AEC-Q100 Grade 1 qualification; enables under-hood and traction battery pack deployment. |
| Driver Output Voltage | 10.8V to 14V (VGSON) - gate-source overdrive relative to SOURCE pin; sufficient to fully enhance N-channel MOSFETs in high-side configurations. |
| Charge Pump Output | 23.5V typical (VCPO) - floating supply referenced to VSTACK; powers all 12 drivers and enables >12V gate swing above highest cell potential. |
| Shutdown Current | 1.4 µA (ISTACK_SD) - ultra-low quiescent current during sleep mode; preserves battery energy when balancing is inactive. |
Pinout & Package
EMB1428QSQX/NOPB uses a 48-pin WQFN package (RHS drawing) with exposed thermal pad soldered to PCB ground plane. Pin count, layout, and thermal pad requirement are confirmed per TI SNVS812A Figure 2 and Package Table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE0–GATE11 | Floating gate drive outputs | Drive N-FET gates in switch matrix; each referenced to its paired SOURCEx pin; 12V swing capability enables full enhancement of high-side FETs. |
| SOURCE0–SOURCE11 | Floating driver reference nodes | Connect directly to FET source terminals; tolerate −0.5V to 70V vs GND; define local ground for associated GATEx output. |
| VSTACK | Highest stack voltage input | Reference for charge pump and internal biasing; must be connected to top of battery string; absolute max 70V. |
| VDDCP | Floating charge pump supply input | Accepts ~23.5V from external charge pump circuit; referenced to VSTACK; powers all 12 floating drivers. |
| CEXT1 / CEXT2 | Differential charge pump clock outputs | 1MHz buffered square waves, 180° out-of-phase; drive external diode-capacitor charge pump network. |
| SCLK / SDI / SDO / CS | SPI bus interface | 1MHz serial interface with 3.3V/5V I/O compatibility (VDDIO); enables cell selection, mode control, and fault readback. |
| FAULT0–FAULT2 | 3-bit digital fault input from EMB1499 | 12V-tolerant Schmitt-trigger inputs; encode fault type (e.g., overcurrent, UVLO) reported by companion DC/DC controller. |
| DIR / EN / DONE / DIR_RT | EMB1499 handshake signals | CMOS/Schmitt logic signals coordinating charge/discharge sequencing; DIR indicates direction; EN triggers cycle start; DONE signals completion. |
Key Features
| Feature | Design Value |
|---|---|
| 12-channel floating gate drive | Enables full control of 7-cell switch matrix using dual-FET topology without level-shifting ICs or discrete charge pumps. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications with −40°C to +125°C operation, enhanced manufacturing flow, and defect detection rigor. |
| Integrated 100kΩ bleeder resistors | Ensures fail-safe FET turn-off during driver fault or power loss; eliminates need for external gate pull-downs. |
| Low-power shutdown mode | Reduces stack supply current to 1.4 µA; maintains system readiness while minimizing parasitic drain on battery pack. |
| 1MHz SPI with fault interrupt | Supports real-time balancing command updates and immediate FAULT_INT assertion (<2 µs latency) for MCU response. |
Applications
| Electric Vehicle Battery Packs | Grid-Scale Energy Storage Systems |
|---|---|
|
Use Scenario: Balancing 14S Li-ion modules in traction battery packs where thermal management and long-term reliability are critical. IC Role / Device Role / Timing Role: Provides isolated gate drive for switch matrix FETs; coordinates with EMB1499 to execute bidirectional energy transfer between selected cell and stack. Use Value: Enables precise per-cell SOC equalization at 60V stack voltage with AEC-Q100 certified robustness and <2.4ms driver activation latency. |
Use Scenario: Active balancing in stationary 48V–60V lithium iron phosphate (LFP) battery banks used for renewable energy time-shifting. IC Role / Device Role / Timing Role: Controls 12 floating gate outputs to route cell energy through bi-directional forward converter; manages sequencing via DIR/EN/DONE handshake. Use Value: Delivers 12V gate drive referenced to floating SOURCE pins, supporting reliable switching in high-noise industrial environments with 1.4µA shutdown current. |
| Hybrid Electric Vehicle Auxiliary Batteries | High-Voltage Industrial UPS Modules |
|
Use Scenario: Cell-level balancing in 12S–14S auxiliary 48V batteries powering ADAS, infotainment, and 48V mild-hybrid systems. IC Role / Device Role / Timing Role: Acts as gate driver interface between MCU and switch matrix; receives SPI commands and reports faults via FAULT_INT and 3-bit FAULT[2:0]. Use Value: Supports 1MHz SPI communication with 50ns timing margins, ensuring deterministic command execution in safety-critical vehicle subsystems. |
Use Scenario: Precision balancing of large-format prismatic cells in mission-critical uninterruptible power supplies requiring >10-year field life. IC Role / Device Role / Timing Role: Supplies stable 12V gate drive using internal charge pump (VCPO = 23.5V) referenced to VSTACK; tolerates ±2kV HBM ESD. Use Value: Eliminates external floating supplies via integrated charge pump architecture, reducing BOM count and improving long-term reliability in sealed UPS enclosures. |
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 |
|---|---|---|---|
| EMB1428QSQE | Same die, 250-unit tape-and-reel packaging; identical electrical specs, pinout, and AEC-Q100 qualification. | No functional difference; suited for prototyping or low-volume production where smaller reels reduce inventory cost. | Select EMB1428QSQE when evaluating or building pre-production units; full drop-in replacement for EMB1428QSQX/NOPB. |
| BQ79616-Q1 | Integrated ADC, voltage/current monitoring, and daisy-chainable SPI; no floating gate drivers-requires external FET drivers. | Targets full-featured battery monitor + balancer SoC applications; not a gate driver-only solution like EMB1428QSQX/NOPB. | Choose BQ79616-Q1 only if system requires on-chip cell voltage measurement and centralized balancing control-not for standalone gate driving. |
Compared with EMB1428QSQX/NOPB, EMB1428QSQE offers identical performance in smaller packaging for evaluation, while BQ79616-Q1 replaces the entire EMB1428+EMB1499 pair with an integrated monitor but removes dedicated floating gate drive capability.
Availability
EMB1428QSQX/NOPB is available at Aetrix Electronics and suitable for electric vehicle battery management, grid-scale energy storage, and industrial UPS systems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for EMB1428QSQX/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 leader specializing in analog, embedded processing, and power management technologies, with deep expertise in automotive and industrial power systems.
The EMB1428QSQX/NOPB belongs to TI's battery management gate driver product line, engineered specifically for high-reliability active cell balancing in automotive and grid-storage applications using switch matrix topologies.
FAQ
What is the primary function of the EMB1428QSQX/NOPB in a battery management system?
The EMB1428QSQX/NOPB serves as a 12-channel floating gate driver IC that controls external N-channel MOSFETs in a switch matrix configuration for active cell balancing. It does not perform voltage measurement or DC/DC control itself-it works exclusively with the EMB1499 controller to enable bidirectional energy transfer between individual Li-ion cells and the full battery stack, supporting up to 60V total stack voltage.
Does the EMB1428QSQX/NOPB include built-in protection features?
Yes, the EMB1428QSQX/NOPB integrates several hardware-level protections: per-driver UVLO prevents output activation unless VDDCP is valid; 100kΩ internal bleeder resistors ensure automatic FET turn-off during failure or power loss; and 12V-tolerant Schmitt-trigger inputs (FAULT0–FAULT2, DONE, DIR_RT) provide noise-immune signaling from the EMB1499. It also meets ±2kV HBM ESD rating.
Can the EMB1428QSQX/NOPB operate without the EMB1499 controller?
No-the EMB1428QSQX/NOPB is functionally dependent on the EMB1499. It lacks internal DC/DC control, current regulation, or balancing algorithm logic. The EMB1428QSQX/NOPB receives balancing commands via SPI but relies entirely on EMB1499 for inductor current control, fault detection, and timing coordination via DIR/EN/DONE/FAULT signals. They form a tightly coupled pair.
What is the role of the CEXT1 and CEXT2 pins on the EMB1428QSQX/NOPB?
The CEXT1 and CEXT2 pins output buffered, differential 1MHz square-wave clocks (180° out-of-phase) that drive an external diode-capacitor charge pump circuit. This external network generates the floating VDDCP supply (~23.5V), which powers all 12 floating gate drivers. These pins do not accept input clocks-they are dedicated outputs essential for establishing the high-side gate drive voltage referenced to VSTACK.
Is the EMB1428QSQX/NOPB pin-compatible with other TI gate drivers like the UCC272xx series?
No-the EMB1428QSQX/NOPB is not pin-compatible with general-purpose gate drivers such as the UCC272xx family. Its 48-pin WQFN layout, floating SOURCE/GATE pairing, CEXT1/CEXT2 charge pump outputs, and EMB1499-specific handshake pins (DIR, EN, DONE, DIR_RT) are unique to the switch matrix architecture. It serves a specialized role distinct from half-bridge or high-side-only drivers.
EMB1428QSQX/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)
EMB1428QSQX/NOPB FAQ
1.How can I place an order for EMB1428QSQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for EMB1428QSQX/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 EMB1428QSQX/NOPB reliable?
The price and inventory of EMB1428QSQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMB1428QSQX/NOPB is usually 5 days.
3.What payment methods are accepted for EMB1428QSQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMB1428QSQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EMB1428QSQX/NOPB?
EMB1428QSQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EMB1428QSQX/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 EMB1428QSQX/NOPB?
For technical support, including EMB1428QSQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMB1428QSQX/NOPB requirements.
6.How does Aetrix verify that EMB1428QSQX/NOPB is sourced from the original manufacturer or authorized distributors?
All EMB1428QSQX/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 EMB1428QSQX/NOPB meets industry standards.
7.What is the process for return or replacement of EMB1428QSQX/NOPB?
All EMB1428QSQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with EMB1428QSQX/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 EMB1428QSQX/NOPB part is unused and in its original packaging.
Return procedure for EMB1428QSQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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