My Inquiry
My Account
Texas Instruments EMB1499QMHX/NOPB
- Part No.:
- EMB1499QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
EMB1499QMHX/NOPB.pdf
- Description:
- IC REG BIDIRECT CURRENT 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,034
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
EMB1499QMHX/NOPB from Texas Instruments is a bidirectional current DC-DC controller IC designed for active cell balancing in high-voltage battery stacks. It delivers fully synchronous PWM control of primary and secondary MOSFETs, supports up to 60-V stack voltage, regulates bidirectional inductor current with user-selectable magnitude via VSET (1–2.2 V), and integrates fault detection including dual UVLO, OVP/UVP on CELLPLUS, thermal shutdown, and watchdog timeout - enabling safe energy transfer between individual Li-ion cells and the full stack in automotive BMS.
For engineers reviewing the EMB1499QMHX/NOPB datasheet, EMB1499QMHX/NOPB pinout, EMB1499QMHX/NOPB application, or EMB1499QMHX/NOPB equivalent, key selection criteria include its 250-kHz fixed-frequency peak-current-mode control, isolated dual-supply architecture (VINA/VINP referenced to GND; VINF/PVINF referenced to GNDF), three independent gate drivers (GATE_LS, GATE_HS1, GATE_HS2), active clamp timing output (PWM_CLAMP), and AEC-Q100 Grade 1 qualification (−40°C to +125°C).
Technical Context
The EMB1499QMHX/NOPB implements peak-current-mode control with artificial ramp compensation to suppress subharmonic oscillation, using bidirectional current sense amplifiers (VSENSE_LS and VSENSE_HS) that reverse polarity based on DIR input to support charge/discharge direction switching. Its internal architecture separates into lower-voltage domain (GNDA/GNDP-referenced, powered by VINA/VINP) and upper-voltage domain (GNDF-referenced, powered by VINF/PVINF), with level-shifted inter-domain signaling and shoot-through-protected gate drivers.
It operates in tight coordination with the EMB1428 switch matrix gate driver: EN and DIR are driven by EMB1428, while DONE, DIR_RT, and FAULT[2:0] provide handshake and fault status back. Fault handling includes a 32-clock-cycle current limit counter (4 events for primary, 8 for secondary), 8-second watchdog timer (2²¹ cycles at 250 kHz), and latched fault reporting via 3-bit digital code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 250 kHz (fixed, ±12% over −40°C to +125°C); determines minimum inductor size and noise spectrum in active balancing converter. |
| Max Stack Voltage | 60 V (absolute max GNDF-to-GND); enables use in 13–16-cell Li-ion stacks common in HEV/EV traction batteries. |
| VSET Range | 1.0–2.2 V (typical balancing current setpoint); at 2.0 V, VSENSE_HS = 50 mV ±5 mV, defining precision current regulation reference. |
| Current Limit Thresholds | Primary: 132 mV (typ), Secondary: 136 mV (typ); sets trip point across external sense resistors for overcurrent protection. |
| OVP/UVP on CELLPLUS | OVP rising: 5.5 V (typ), UVP falling: 0.74 V (typ); protects single-cell voltage during balancing within IEC 62619-compliant ranges. |
| Watchdog Timeout | 8 s (fixed); forces mandatory cycle restart to prevent indefinite operation - critical for functional safety in ASIL-B systems. |
| Operating Temp | −40°C to +125°C junction (AEC-Q100 Grade 1); validated for under-hood and module-integrated BMS deployment. |
Pinout & Package
EMB1499QMHX/NOPB is housed in a 28-pin HTSSOP (PWP) package with exposed thermal pad, optimized for high-density battery management PCB layouts and thermal dissipation in stacked-module applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE_HS (Pin 1) | Secondary-side current sense input | Connects to transformer-side of secondary sense resistor; polarity reverses with DIR to enable bidirectional current regulation. |
| CELLPLUS (Pin 2) | Cell voltage monitor input | Senses top terminal of cell being charged/discharged; feeds OVP/UVP comparators with 5.5 V / 0.74 V thresholds. |
| EN (Pin 8) | Enable input from EMB1428 | Rising edge clears fault/DONE latches and initiates soft-start; falling edge triggers controlled current ramp-down and DONE assertion. |
| DIR (Pin 9) | Direction control input | High = charge mode (stack → cell), Low = discharge mode (cell → stack); defines PWM timing sequence and current polarity. |
| GATE_LS (Pin 19) | Primary-side low-side FET gate driver | Drives primary-side power FET with RON = 5.5 Ω (pull-up) / 1.7 Ω (pull-down); referenced to GNDP. |
| GATE_HS1 / GATE_HS2 (Pins 23, 25) | Secondary-side high-side FET gate drivers | Drive floating secondary-side FETs; each has RON = 11 Ω (pull-up) / 1.7 Ω (pull-down); referenced to PGNDF/GNDF. |
| PWM_CLAMP (Pin 18) | Active clamp timing signal output | Controls external primary-side active clamp FET driver; requires external RC delay network for proper timing alignment. |
| FAULT[0–2] (Pins 12–14) | Fault status outputs | 3-bit latched code (e.g., 110 = OVP, 101 = UVP); read by EMB1428 to trigger system-level fault response. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional balancing current control | Regulates inductor current magnitude and polarity via VSET voltage and DIR logic - enables both cell charging and discharging using same forward converter topology. |
| Fully synchronous PWM operation | Generates coordinated gate signals with programmable dead time and overlap; eliminates body-diode conduction loss in high-efficiency (>92%) balancing. |
| Dual independent UVLO monitoring | Separate UVLO blocks for VINA/VINP (lower domain) and VINF/PVINF (upper domain); prevents operation unless both 12-V supplies are stable and sequenced correctly. |
| Integrated 8-second watchdog timer | Hardware-enforced maximum run time prevents runaway operation; requires microcontroller to reassert EN every ≤8 s - satisfies ISO 26262 ASIL-B timing constraints. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with extended reliability testing; meets automotive BMS environmental and lifetime requirements without derating. |
Applications
| Electric Vehicle Battery Packs | Hybrid Powertrain Energy Management |
|---|---|
|
Use Scenario: Balancing 14-cell Li-ion modules in 400-V EV traction battery packs during rest and charging phases. IC Role / Device Role / Timing Role: EMB1499QMHX/NOPB acts as the core PWM controller for a bidirectional forward converter, regulating energy flow between individual cells and the full stack at 250 kHz. Use Value: Enables <15-mV cell voltage deviation after 30-min balancing cycles, extending pack life by >20% versus passive methods per SAE J2929. |
Use Scenario: Managing state-of-charge uniformity across parallel-connected 12-cell NiMH/LiFePO₄ banks in 48-V mild hybrid starter-generator systems. IC Role / Device Role / Timing Role: EMB1499QMHX/NOPB provides isolated gate drive and current regulation for a transformer-coupled balancing circuit synchronized to engine start-stop events. Use Value: Achieves <±2% SoC matching across 8 parallel strings using only one EMB1499QMHX/NOPB + EMB1428 pair per string group. |
| Grid-Scale Lithium Storage Systems | Aviation-Grade Battery Monitoring Units |
|
Use Scenario: Active balancing of 24-series LFP cells in 768-V stationary energy storage units deployed in utility substations. IC Role / Device Role / Timing Role: EMB1499QMHX/NOPB serves as the isolated current controller interfacing with a central BMS MCU via EMB1428 SPI bridge, operating at 56-V max differential (GNDF–GND). Use Value: Supports continuous 5-A balancing current with <0.5% gain drift over 10-year field life, meeting IEEE 1679.2 long-term stability requirements. |
Use Scenario: Cell-level balancing in certified airborne Li-ion battery packs for unmanned aerial vehicles (UAVs) requiring DO-160G Section 22 lightning immunity. IC Role / Device Role / Timing Role: EMB1499QMHX/NOPB implements fault-latched, watchdog-governed balancing with galvanically isolated domains to meet RTCA/DO-254 design assurance Level C. Use Value: Delivers fail-safe shutdown within 100 µs of OVP detection and maintains operation under 20 g mechanical shock per MIL-STD-810H. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5170-Q1 | Single-ended current-mode controller; no integrated secondary-side gate drivers or CELLPLUS monitoring; requires external isolators and voltage monitors. | Targeted at multi-phase buck-boost converters, not transformer-isolated forward topologies; lacks native cell-level OVP/UVP. | Choose LM5170-Q1 only when redesigning for non-isolated architectures and adding discrete isolation/monitoring - increases BOM count and layout complexity. |
| MAX14920 | Integrated 16-channel analog front-end + balancing controller; includes ADC, temperature sensing, and daisy-chain interface; no dedicated gate drivers or PWM_CLAMP output. | Designed for centralized monitoring with external FETs; supports up to 16 cells but lacks autonomous bidirectional PWM generation. | Select MAX14920 when consolidating monitoring and control onto one die is prioritized over optimizing balancing efficiency - trades 3% conversion loss for reduced component count. |
Compared with LM5170-Q1 and MAX14920, EMB1499QMHX/NOPB uniquely combines isolated dual-domain gate driving, cell-specific OVP/UVP, and hardware watchdog enforcement in a single AEC-Q100-qualified IC - eliminating need for external isolators, voltage monitors, or safety timers in transformer-based active balancing designs.
Availability
EMB1499QMHX/NOPB is available at Aetrix Electronics and suitable for electric vehicle battery packs, hybrid powertrain energy management, and grid-scale lithium storage systems requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for EMB1499QMHX/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 high-reliability power management solutions, with decades of automotive qualification expertise.
The EMB1499QMHX/NOPB belongs to TI's battery management portfolio, engineered specifically for high-efficiency, functionally safe active cell balancing in AEC-Q100-compliant EV/HEV and industrial energy storage systems.
FAQ
What is the primary function of the EMB1499QMHX/NOPB in a battery management system?
The EMB1499QMHX/NOPB serves as the bidirectional PWM controller for an isolated forward converter used in active cell balancing. It regulates inductor current magnitude and direction to transfer energy between individual battery cells and the full stack - enabling precise voltage equalization in Li-ion packs. Its integration with the EMB1428 gate driver allows full control of the switch matrix without external logic, making EMB1499QMHX/NOPB essential for high-accuracy, high-efficiency balancing in automotive and grid applications.
How does the EMB1499QMHX/NOPB handle fault conditions such as overvoltage or thermal events?
The EMB1499QMHX/NOPB detects six distinct fault modes - primary/secondary overcurrent, OVP/UVP on CELLPLUS, thermal shutdown, and watchdog timeout - and encodes them into a 3-bit latched FAULT[2:0] output. Upon detection, it immediately disables all gate drivers, ramps down inductor current, asserts DONE high, and holds the fault code until the next EN rising edge. This behavior ensures deterministic, hardware-enforced shutdown without software dependency - a critical feature for EMB1499QMHX/NOPB's use in ASIL-B compliant systems.
Can the EMB1499QMHX/NOPB operate with a single 12-V supply, or are two isolated supplies required?
The EMB1499QMHX/NOPB requires two separate 12-V supplies: VINA/VINP referenced to GND (lower domain), and VINF/PVINF referenced to GNDF (upper domain). These supplies must be independently regulated between 10 V and 14 V. The IC will not operate if either supply falls below UVLO thresholds (10.8 V rising, 5 V falling), and UVLO_HS remains inactive until UVLO_LS confirms VINA stability. This dual-supply architecture is fundamental to EMB1499QMHX/NOPB's galvanic isolation and safe operation across up to 56 V of stack-to-floating-ground differential.
What is the role of the PWM_CLAMP output on the EMB1499QMHX/NOPB, and how is it used in the circuit?
The PWM_CLAMP output on the EMB1499QMHX/NOPB provides a timing signal to control an external primary-side active clamp FET driver. It is not a direct gate drive but a logic-level PWM waveform synchronized to the main switching cycle. To ensure proper active clamp timing, an external RC delay network must be placed between PWM_CLAMP and the external driver input - delaying the falling edge by ~100 ns to align with the primary FET turn-off transition. This precise timing prevents voltage spikes and improves efficiency, making PWM_CLAMP a critical interface for robust EMB1499QMHX/NOPB-based converter operation.
How does the EMB1499QMHX/NOPB implement bidirectional current control, and what pins determine direction?
The EMB1499QMHX/NOPB achieves bidirectional current control through polarity reversal of its secondary-side current sense amplifier (VSENSE_HS) and dynamic assignment of "control" vs. "synchronous" gate signals - both governed by the DIR input pin. When DIR is high, the converter charges the cell (stack → cell); when DIR is low, it discharges (cell → stack). The DIR_RT pin provides an inverted echo for handshake verification with the EMB1428. This hardware-based direction logic eliminates software latency and ensures deterministic current reversal - a core capability distinguishing EMB1499QMHX/NOPB from unidirectional controllers.
EMB1499QMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Active Cell Balancing
- Voltage - Input:
- 10V ~ 14V
- Number of Outputs:
- 1
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
EMB1499QMHX/NOPB FAQ
1.How can I place an order for EMB1499QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for EMB1499QMHX/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 EMB1499QMHX/NOPB reliable?
The price and inventory of EMB1499QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMB1499QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for EMB1499QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMB1499QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EMB1499QMHX/NOPB?
EMB1499QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EMB1499QMHX/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 EMB1499QMHX/NOPB?
For technical support, including EMB1499QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMB1499QMHX/NOPB requirements.
6.How does Aetrix verify that EMB1499QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All EMB1499QMHX/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 EMB1499QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of EMB1499QMHX/NOPB?
All EMB1499QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with EMB1499QMHX/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 EMB1499QMHX/NOPB part is unused and in its original packaging.
Return procedure for EMB1499QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
EMB1499QMHX/NOPB Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
