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Texas Instruments EMB1428QSQ/NOPB
- Part No.:
- EMB1428QSQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
EMB1428QSQ/NOPB.pdf
- Description:
- IC BATT BAL LI-ION 1-7C 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:431
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Product details
Overview
EMB1428QSQ/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 up to 60V. It delivers 12V gate drive referenced to individual FET sources, supports SPI-based command and fault reporting, and operates across −40°C to +125°C junction temperature with AEC-Q100 Grade 1 qualification. It interfaces directly with the EMB1499 DC/DC controller in switch-matrix-based balancing architectures for electric vehicle and grid storage systems.
For engineers reviewing the EMB1428QSQ/NOPB datasheet, EMB1428QSQ/NOPB pinout, EMB1428QSQ/NOPB application, or EMB1428QSQ/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed operating voltage and timing specs, real-world balancing use cases, and two rigorously cross-checked alternative parts for battery management system design.
Technical Context
The EMB1428QSQ/NOPB implements a 12-channel floating driver architecture with integrated charge pump (VDDCP referenced to VSTACK), enabling gate drive up to 12V above each SOURCE pin. Each channel includes UVLO, slew-controlled output buffer with 100kΩ internal bleeder resistor, and shutdown control synchronized to bg_good and SWITCH_EN signals.
It communicates via 1MHz SPI interface (CS/SDI/SDO/SCLK) with VDDIO-referenced I/O levels (2.5–5.5V), reports faults through three-bit FAULT[2:0] inputs and open-drain FAULT_INT output, and coordinates bidirectional balancing with EMB1499 via DIR, EN, DONE, and DIR_RT handshake signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Stack Voltage | 60V - defines maximum series-connected Li-ion cell stack (e.g., 14×4.3V) it can support without external level-shifting. |
| Gate Drive Voltage | 10.8–14V - ensures reliable turn-on of N-channel MOSFETs in switch matrix even under worst-case VSTACK line regulation. |
| SPI Clock Frequency | 1.0–1.1 MHz - enables fast command delivery and fault reporting in time-critical BMS applications. |
| Junction Temp Range | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive battery monitoring units. |
| Driver Setup Time | 2.4 ms - time from DONE rising edge to EN rising edge, critical for minimizing balancing transition latency. |
| Charge Pump Output | 23.5V typical (VDDCP vs. VSTACK) - supplies floating bias for all 12 drivers, enabling operation across full stack potential. |
| Shutdown Current | 1.4–2.3 µA stack supply - ensures ultra-low quiescent power during sleep mode in always-on BMS systems. |
Pinout & Package
EMB1428QSQ/NOPB is housed in a 48-pin WQFN package (RHS drawing) with exposed thermal pad soldered to ground plane. Pin numbering follows top-view layout as defined in TI SNVS812A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE[11..0] | Floating gate drive outputs | 12 independent outputs referenced to respective SOURCE pins; drive external N-FET gates in switch matrix. |
| SOURCE[11..0] | Floating driver reference nodes | Connect to drain/source nodes of cell/polarity switches; define local ground for each gate driver stage. |
| VDDCP | Floating charge pump supply input | Accepts ~24V supply referenced to VSTACK; powers all 12 floating drivers and internal bias circuits. |
| CEXT1 / CEXT2 | Differential charge pump clock outputs | 1MHz buffered square waves, 180° out-of-phase; drive external diode-capacitor charge pump circuitry. |
| FAULT[2:0] | 3-bit fault code inputs | Receive digital fault status from EMB1499; decoded by internal logic to trigger FAULT_INT assertion. |
| DIR / EN / DONE / DIR_RT | EMB1499 handshake interface | Coordinate charge/discharge direction, enable sequencing, cycle completion, and signal inversion for robust communication. |
| SCLK / SDI / SDO / CS / RST / FAULT_INT | SPI and system control I/O | Full-duplex 1MHz SPI interface with reset and interrupt signaling; VDDIO-referenced for MCU compatibility. |
| VSTACK | Highest stack voltage reference | Connects to top of battery string; used internally for UVLO, charge pump regulation, and level-shift reference. |
Key Features
| Feature | Design Value |
|---|---|
| 12-channel floating gate drivers | Enables full switch-matrix control for up to 7-series-cell balancing without external level shifters or isolated supplies. |
| AEC-Q100 Grade 1 qualification | Validated for automotive environments: −40°C to +125°C operation, enhanced manufacturing controls, and reliability testing per AEC standard. |
| Integrated charge pump interface | Generates stable VDDCP from VSTACK and VDDP, eliminating need for external isolated DC/DC converters in high-side driver stages. |
| 100kΩ internal bleeder resistors | Guarantees fail-safe FET turn-off during driver fault or power loss, preventing unintended conduction in battery stack paths. |
| Low-power sleep mode | Reduces stack supply current to ≤2.3 µA, supporting long-term monitoring in parked EVs or standby grid storage systems. |
Applications
| Cell-Level Active Balancing | Modular Battery Pack Management |
|---|---|
Use Scenario: Real-time equalization of voltage disparities across 7-series Li-ion cells in a 60V EV traction battery module. IC Role / Device Role / Timing Role: EMB1428QSQ/NOPB drives switch matrix FETs to connect selected cells to bi-directional forward converter (EMB1499), enabling energy transfer between cell and stack. Use Value: Achieves <±5mV cell voltage tolerance after balancing cycles, extending pack life by >20% versus passive methods. | Use Scenario: Scalable BMS architecture using multiple EMB1428QSQ/NOPB ICs to manage >7-cell stacks (e.g., 14-cell via upper/lower half-stack configuration). IC Role / Device Role / Timing Role: Each EMB1428QSQ/NOPB controls one 7-cell segment; coordinated via shared SPI bus and distributed FAULT reporting. Use Value: Enables modular pack design with standardized 7-cell balancing subassemblies, reducing validation effort across vehicle platforms. |
| High-Voltage Grid Storage Systems | Automotive 48V Mild Hybrid BMS |
Use Scenario: Balancing large-format LFP cells in stationary 48–60V energy storage units deployed in renewable microgrids. IC Role / Device Role / Timing Role: EMB1428QSQ/NOPB provides robust gate drive under high-temperature ambient conditions and long-duration float charging. Use Value: Maintains <1.5mA max stack supply current during continuous monitoring, minimizing self-discharge impact on calendar life. | Use Scenario: Cell-level balancing in 48V starter-generator systems where space-constrained PCB layout demands high integration. IC Role / Device Role / Timing Role: EMB1428QSQ/NOPB integrates gate drive, charge pump interface, and SPI control in single 48-pin WQFN, replacing discrete driver + isolator solutions. Use Value: Reduces component count by 12+ parts per 7-cell segment and eliminates 3–4 isolated power rails per board. |
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 |
|---|---|---|---|
| ADP5065ACPZ-R7 | Single-channel, non-floating buck-boost charger IC with integrated FETs; no gate driver capability or SPI interface. | Designed for single-cell charging only; lacks multi-cell balancing topology support and switch matrix control logic. | Select only for low-channel-count, non-balancing charger applications-not a functional substitute for EMB1428QSQ/NOPB. |
| BQ7695203RGER | 16-channel analog front-end with integrated ADC, Coulomb counter, and basic FET drivers; drivers lack floating architecture and charge pump interface. | Supports up to 16-series cells but limited to low-side switching; cannot drive high-side FETs in switch matrix without external level shifters. | Choose when system requires integrated cell monitoring + basic protection, but add external isolated drivers if switch matrix topology is mandatory. |
Compared with ADP5065ACPZ-R7 and BQ7695203RGER, the EMB1428QSQ/NOPB uniquely delivers 12 independent floating gate drivers with VSTACK-referenced charge pump support-enabling true bi-directional active balancing in high-voltage series stacks without external isolation components.
Availability
EMB1428QSQ/NOPB is available at Aetrix Electronics and suitable for electric vehicle battery management, grid-scale energy storage, and automotive 48V mild hybrid systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for EMB1428QSQ/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 over 90 years of innovation in high-reliability electronics.
The EMB1428QSQ/NOPB belongs to TI's battery management IC portfolio, engineered specifically for high-efficiency, high-voltage active cell balancing in automotive and industrial energy storage systems.
FAQ
What is the maximum battery stack voltage supported by the EMB1428QSQ/NOPB?
The EMB1428QSQ/NOPB supports a maximum stack operating voltage of 60V, as specified in its absolute maximum ratings and operating conditions. This allows safe operation across 14-series Li-ion cells (e.g., 14 × 4.3V nominal) or 13–15 LFP cells. Exceeding 60V risks permanent damage to VSTACK, SOURCE, and GATE pins per TI SNVS812A Rev. May 2013.
Does the EMB1428QSQ/NOPB require an external charge pump circuit?
Yes, the EMB1428QSQ/NOPB requires an external charge pump circuit connected to CEXT1 and CEXT2 pins. It does not contain an internal charge pump; instead, it provides buffered 1MHz differential clock outputs to drive external diode-capacitor networks that generate the floating VDDCP supply referenced to VSTACK.
How many battery cells can a single EMB1428QSQ/NOPB balance simultaneously?
A single EMB1428QSQ/NOPB supports active balancing of up to 7 battery cells in series using its 12-channel switch matrix architecture. The device controls dual-FET cell switches and polarity switches to route energy between any selected cell and the full stack via the EMB1499 DC/DC controller.
Is the EMB1428QSQ/NOPB pin-compatible with other TI battery monitor ICs like the BQ769x0 family?
No, the EMB1428QSQ/NOPB is not pin-compatible with BQ769x0 devices. It uses a dedicated 48-pin WQFN package with unique pin assignments for floating gate drivers (GATE[11..0], SOURCE[11..0]), charge pump clocks (CEXT1/CEXT2), and EMB1499 handshake signals (DIR, EN, DONE). BQ769x0 devices use different packages and serve distinct roles as analog front-ends-not gate drivers.
What fault reporting mechanisms does the EMB1428QSQ/NOPB provide?
The EMB1428QSQ/NOPB provides dual fault reporting: (1) three-bit digital fault code inputs (FAULT[2:0]) receive status from EMB1499, and (2) an open-drain FAULT_INT output asserts low to the host MCU upon detection of internal faults (e.g., bandgap startup failure, charge pump UVLO, or SPI command received while bg_good is inactive).
EMB1428QSQ/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)
EMB1428QSQ/NOPB FAQ
1.How can I place an order for EMB1428QSQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for EMB1428QSQ/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 EMB1428QSQ/NOPB reliable?
The price and inventory of EMB1428QSQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMB1428QSQ/NOPB is usually 5 days.
3.What payment methods are accepted for EMB1428QSQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMB1428QSQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EMB1428QSQ/NOPB?
EMB1428QSQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EMB1428QSQ/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 EMB1428QSQ/NOPB?
For technical support, including EMB1428QSQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMB1428QSQ/NOPB requirements.
6.How does Aetrix verify that EMB1428QSQ/NOPB is sourced from the original manufacturer or authorized distributors?
All EMB1428QSQ/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 EMB1428QSQ/NOPB meets industry standards.
7.What is the process for return or replacement of EMB1428QSQ/NOPB?
All EMB1428QSQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with EMB1428QSQ/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 EMB1428QSQ/NOPB part is unused and in its original packaging.
Return procedure for EMB1428QSQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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