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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Texas Instruments EMB1499QMH/NOPB

Name: EMB1499QMH/NOPB
Brand: Texas Instruments
SKU: EMB1499QMH/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: EMB1499QMH/NOPB

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 28-PowerTSSOP (0.173", 4.40mm Width)

Datasheet:: EMB1499QMH/NOPB.pdf

Description:: IC REG BIDIRECT CURRENT 28HTSSOP

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Product details

Overview

EMB1499QMH/NOPB from Texas Instruments is a bidirectional current DC-DC controller IC designed for active cell balancing in high-voltage battery stacks. It delivers 250-kHz synchronous PWM control, supports up to 60-V stack voltage, regulates bidirectional inductor current via user-adjustable VSET (1–2.2 V), and integrates dual-domain gate drivers (GATE_LS, GATE_HS1/GATE_HS2) for isolated forward converter topologies used in automotive Li-ion BMS.

For engineers reviewing the EMB1499QMH/NOPB datasheet, EMB1499QMH/NOPB pinout, EMB1499QMH/NOPB application, or EMB1499QMH/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (−40°C to +125°C), dual UVLO monitoring (VINA & VINF), three-bit fault encoding (FAULT[2:0]), and explicit support for 7-cell half-stack balancing with EMB1428 switch matrix coordination.

Technical Context

The EMB1499QMH/NOPB implements peak current mode control with artificial ramp compensation to prevent subharmonic oscillation, using separate current sense amplifiers for primary (VSENSE_LS) and secondary (VSENSE_HS) sides referenced to distinct ground domains (GNDA and GNDF). Its timing generator dynamically assigns "control" vs. "synchronous" gate signals based on DIR logic level to manage charge/discharge polarity.

It operates across two isolated voltage domains: the lower domain (GNDA-referenced) powers bias circuitry, fault logic, and interfaces with EMB1428/MCU via EN, DIR, DONE, and FAULT pins; the upper domain (GNDF-referenced) powers floating gate drivers (GATE_HS1/HS2, PWM_CLAMP) and senses CELLPLUS voltage, requiring external 12-V supplies (VINF/PVINF) referenced to GNDF.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	220–290 kHz (typ. 250 kHz); fixed-frequency operation enables predictable EMI filtering and transformer design.
Balancing Current Control	VSET input (1–2.2 V) sets reference for ±50 mV (typ.) VSENSE_HS feedback; determines precise bidirectional current magnitude via external sense resistor.
Stack Voltage Range	0–56 V (GNDF to GND); supports up to 7-series Li-ion cells with margin for transient overvoltage.
Fault Detection	Three independent fault types encoded on FAULT[2:0]: OVP/UVP (CELLPLUS), thermal shutdown (165°C), watchdog timeout (8 s), and dual current limits (VCL_HS/VCL_LS).
Gate Driver Outputs	GATE_LS (primary-side), GATE_HS1/HS2 (secondary-side), and PWM_CLAMP (active clamp timing); all include shoot-through protection and UVLO-driven disable.
Operating Temperature	−40°C to +125°C junction; AEC-Q100 Grade 1 qualified for under-hood automotive battery management systems.
Supply Requirements	Dual 10–14 V rails: VINA/VINP (GNDA-referenced) and VINF/PVINF (GNDF-referenced); enables galvanic isolation between control and floating power domains.

Pinout & Package

EMB1499QMH/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 automotive modules.

Pin/Terminal	Circuit Role	Design Meaning
VSENSE_HS (Pin 1)	Secondary-side current sense input	Connects to transformer-side of secondary sense resistor; enables bidirectional current regulation referenced to GNDF.
CELLPLUS (Pin 2)	Cell voltage monitor input	Senses top of cell being charged/discharged; triggers OVP (4.5–7 V) or UVP (0.55–0.95 V) faults.
EN (Pin 8)	Enable input from EMB1428	Rising edge clears fault/DONE latches and initiates soft-start; falling edge ramps current to zero and asserts DONE.
DIR (Pin 9)	Direction control input	High = charge mode (stack → cell), Low = discharge mode (cell → stack); defines polarity of regulated inductor current.
DONE (Pin 11)	Operation completion output	Latched high after current ramp-down completes; signals EMB1428 that balancing cycle has safely terminated.
FAULT[0:2] (Pins 12–14)	Fault code outputs	3-bit digital word indicating fault type (e.g., 110 = OVP, 101 = UVP); read by EMB1428 to trigger system-level response.
GATE_LS (Pin 19)	Primary-side FET gate driver	Drives low-side MOSFET on non-floating side; R_ON = 3.6–8.4 Ω (pull-up), 1.1–3.2 Ω (pull-down) at 100 mA.
GATE_HS1/HS2 (Pins 23, 25)	Secondary-side FET gate drivers	Drive high-side MOSFETs on floating side; each has R_ON = 7–16 Ω (pull-up), 0.9–3.2 Ω (pull-down) at 100 mA.
PWM_CLAMP (Pin 18)	Active clamp timing signal	Controls external primary-side active clamp FET driver; requires external RC delay network for proper timing alignment.
VSET (Pin 6)	Balancing current setpoint	Analog voltage (1–2.2 V) setting target inductor current; factory-trimmed for highest accuracy at 2 V.

Key Features

Feature	Design Value
Bidirectional balancing control	Enables energy transfer both from stack to cell (charge) and cell to stack (discharge) using single forward converter topology.
Dual-domain architecture	Separates GNDA-referenced control logic and GNDF-referenced floating gate drivers, eliminating need for external isolators.
Integrated fault encoding	Three-bit FAULT[2:0] output directly reports six distinct fault conditions (OVP, UVP, thermal, watchdog, primary/secondary overcurrent) without MCU intervention.
Soft-start/shutdown sequencing	Internal Cstart-based ramp generator ensures controlled inductor current ramp-up (startup) and ramp-down (shutdown) within ~300 µs.
Watchdog timer enforcement	Hardware-implemented 8-second maximum runtime prevents unattended continuous operation; resets only on EN toggle.

Applications

Automotive Battery Pack Balancing	Hybrid Electric Vehicle (HEV) BMS
Use Scenario: Active balancing of 7-series Li-ion cells in traction battery packs during charging and regenerative braking cycles. IC Role / Device Role / Timing Role: EMB1499QMH/NOPB acts as the isolated PWM controller regulating bidirectional inductor current, synchronized with EMB1428 switch matrix to route energy between individual cells and the full stack. Use Value: Enables precise per-cell state-of-charge equalization at 250 kHz, supporting AEC-Q100 Grade 1 reliability across −40°C to +125°C ambient.	Use Scenario: Cell-level voltage regulation in 48–60 V HEV auxiliary battery systems with thermal constraints. IC Role / Device Role / Timing Role: EMB1499QMH/NOPB provides fault-monitored, dual-supply-controlled gate drive for forward converter, interfacing directly with MCU via DIR/EN/DONE handshake protocol. Use Value: Delivers OVP/UVP detection (CELLPLUS), thermal shutdown (165°C), and watchdog timeout (8 s) to meet ASIL-B functional safety requirements.
Grid-Scale Energy Storage	Industrial UPS Battery Management
Use Scenario: Long-duration balancing in stationary 48 V lithium iron phosphate (LiFePO₄) battery banks for renewable integration. IC Role / Device Role / Timing Role: EMB1499QMH/NOPB serves as the core DC-DC controller in modular balancing units, coordinating with central BMS via SPI-connected EMB1428 to manage multiple 7-cell sub-stacks. Use Value: Supports stable 60-V max stack operation with dual UVLO (VINA/VINF) ensuring robust startup under brownout conditions common in grid-edge environments.	Use Scenario: High-availability balancing in mission-critical uninterruptible power supply systems with redundant battery strings. IC Role / Device Role / Timing Role: EMB1499QMH/NOPB executes fast-fault response (sub-millisecond current limit detection) and latchable DONE signaling to enable deterministic fail-safe shutdown sequences. Use Value: Provides traceable fault codes (FAULT[2:0]) and thermal shutdown with 165°C threshold, enabling predictive maintenance and reducing mean time to repair.

Automotive Battery Pack Balancing

Hybrid Electric Vehicle (HEV) BMS

Use Scenario: Active balancing of 7-series Li-ion cells in traction battery packs during charging and regenerative braking cycles.

IC Role / Device Role / Timing Role: EMB1499QMH/NOPB acts as the isolated PWM controller regulating bidirectional inductor current, synchronized with EMB1428 switch matrix to route energy between individual cells and the full stack.

Use Value: Enables precise per-cell state-of-charge equalization at 250 kHz, supporting AEC-Q100 Grade 1 reliability across −40°C to +125°C ambient.

Use Scenario: Cell-level voltage regulation in 48–60 V HEV auxiliary battery systems with thermal constraints.

IC Role / Device Role / Timing Role: EMB1499QMH/NOPB provides fault-monitored, dual-supply-controlled gate drive for forward converter, interfacing directly with MCU via DIR/EN/DONE handshake protocol.

Use Value: Delivers OVP/UVP detection (CELLPLUS), thermal shutdown (165°C), and watchdog timeout (8 s) to meet ASIL-B functional safety requirements.

Grid-Scale Energy Storage

Industrial UPS Battery Management

Use Scenario: Long-duration balancing in stationary 48 V lithium iron phosphate (LiFePO₄) battery banks for renewable integration.

IC Role / Device Role / Timing Role: EMB1499QMH/NOPB serves as the core DC-DC controller in modular balancing units, coordinating with central BMS via SPI-connected EMB1428 to manage multiple 7-cell sub-stacks.

Use Value: Supports stable 60-V max stack operation with dual UVLO (VINA/VINF) ensuring robust startup under brownout conditions common in grid-edge environments.

Use Scenario: High-availability balancing in mission-critical uninterruptible power supply systems with redundant battery strings.

IC Role / Device Role / Timing Role: EMB1499QMH/NOPB executes fast-fault response (sub-millisecond current limit detection) and latchable DONE signaling to enable deterministic fail-safe shutdown sequences.

Use Value: Provides traceable fault codes (FAULT[2:0]) and thermal shutdown with 165°C threshold, enabling predictive maintenance and reducing mean time to repair.

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 with integrated current sense amps; no native dual-domain isolation or CELLPLUS monitoring.	Requires external isolation and discrete OVP/UVP circuitry; suited for non-battery-specific isolated DC-DC, not cell-balancing topologies.	Select when designing custom isolated buck-boost converters without TI's EMB1428 switch matrix ecosystem.
UCC28950-Q1	Phase-shifted full-bridge controller; lacks bidirectional current regulation, VSET interface, or CELLPLUS fault inputs.	Designed for high-efficiency power conversion, not per-cell voltage regulation; no built-in cell-level protection logic.	Choose for high-power isolated DC-DC where cell balancing is handled separately by dedicated analog front-end ICs.

Compared with LM5170-Q1 and UCC28950-Q1, the EMB1499QMH/NOPB uniquely integrates cell voltage sensing (CELLPLUS), bidirectional current control (VSET/VSENSE_HS), and dual-domain gate drivers-enabling direct use with TI's EMB1428 switch matrix for automotive-grade active balancing without added isolation or protection components.

Availability

EMB1499QMH/NOPB is available at Aetrix Electronics and suitable for automotive battery management systems, hybrid/electric vehicle powertrain modules, and grid-scale energy storage applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for EMB1499QMH/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-grade ICs and battery management solutions.

The EMB1499QMH/NOPB belongs to TI's Battery Management IC portfolio, engineered specifically for high-reliability active cell balancing in electric vehicle and energy storage systems using isolated forward converter topologies.

FAQ

What is the primary function of the EMB1499QMH/NOPB in a battery management system?

The EMB1499QMH/NOPB functions as a bidirectional current DC-DC controller that regulates inductor current in an isolated forward converter to enable active cell balancing. It works exclusively with the EMB1428 switch matrix IC to route energy between individual Li-ion cells and the full battery stack, supporting charge (stack→cell) and discharge (cell→stack) modes under precise VSET-defined current control and comprehensive fault monitoring.

How does the EMB1499QMH/NOPB handle fault conditions, and what role do the FAULT[2:0] pins play?

The EMB1499QMH/NOPB detects six distinct fault conditions-including OVP/UVP on CELLPLUS, primary/secondary overcurrent, thermal shutdown (165°C), and watchdog timeout (8 s)-and encodes them into a 3-bit digital word output on FAULT[0], FAULT[1], and FAULT[2]. This fault code is latched and held until the next EN rising edge, allowing the EMB1428 to read the status and initiate system-level response without MCU polling overhead.

Can the EMB1499QMH/NOPB operate without the EMB1428, and what is the relationship between EN, DIR, and DONE signals?

No-the EMB1499QMH/NOPB is designed to operate only in tandem with the EMB1428. The EN pin receives enable/disable commands from EMB1428 to start or terminate balancing cycles; DIR sets direction (high = charge, low = discharge); and DONE signals completion of current ramp-down. These signals form a hardware handshake protocol: EN rising clears latches, DIR sets polarity, and DONE going high confirms safe shutdown before next EN assertion.

What are the critical supply requirements for the EMB1499QMH/NOPB, and why are two separate 12-V rails needed?

The EMB1499QMH/NOPB requires two independent 10–14 V supplies: VINA/VINP referenced to GNDA (for control logic and primary-side drivers), and VINF/PVINF referenced to GNDF (for floating secondary-side drivers and CELLPLUS sensing). This dual-rail architecture maintains galvanic isolation between the grounded MCU/EMB1428 domain and the floating transformer secondary domain-eliminating external isolators while ensuring accurate cell voltage measurement and safe gate driving across 56 V potential differences.

How is balancing current adjusted on the EMB1499QMH/NOPB, and what is the significance of the VSET pin specification?

Balance current is precisely set via the analog VSET pin (1–2.2 V), which establishes the error amplifier reference for VSENSE_HS feedback. At VSET = 2 V, the EMB1499QMH/NOPB is factory-trimmed for ±5 mV typical VSENSE_HS accuracy, enabling high-precision current regulation. The actual balancing current equals VSENSE_HS / R_SENSE2, where R_SENSE2 is the secondary-side sense resistor value-allowing flexible current scaling from milliamps to several amps depending on application needs.

EMB1499QMH/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 28-PowerTSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

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

EMB1499QMH/NOPB FAQ

1.How can I place an order for EMB1499QMH/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for EMB1499QMH/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 EMB1499QMH/NOPB reliable?

The price and inventory of EMB1499QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMB1499QMH/NOPB is usually 5 days.

3.What payment methods are accepted for EMB1499QMH/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMB1499QMH/NOPB transactions.

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4.How is shipping managed for EMB1499QMH/NOPB?

EMB1499QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your EMB1499QMH/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 EMB1499QMH/NOPB?

For technical support, including EMB1499QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMB1499QMH/NOPB requirements.

6.How does Aetrix verify that EMB1499QMH/NOPB is sourced from the original manufacturer or authorized distributors?

All EMB1499QMH/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 EMB1499QMH/NOPB meets industry standards.

7.What is the process for return or replacement of EMB1499QMH/NOPB?

All EMB1499QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with EMB1499QMH/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 EMB1499QMH/NOPB part is unused and in its original packaging.

Return procedure for EMB1499QMH/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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