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Texas Instruments LM3492QMH/NOPB
- Part No.:
- LM3492QMH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492QMH/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,773
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Product details
Overview
LM3492QMH/NOPB from Texas Instruments is an automotive-grade, two-channel individual dimmable LED driver IC integrating a boost converter and fast current regulators for LCD backlight applications. It delivers up to 15 W total power across two LED strings (≤65 V per string), supports 50–200 mA programmable LED current per channel with ±3% accuracy, and operates from 4.5 V to 65 V input. Its Projected-On-Time (POT) control enables stable ceramic-capacitor operation without loop compensation.
For engineers reviewing the LM3492QMH/NOPB datasheet, LM3492QMH/NOPB pinout, LM3492QMH/NOPB application, or LM3492QMH/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification, 1000:1 contrast ratio at >3 kHz dimming, dynamic headroom control for efficiency optimization, and bidirectional COMM pin for MCU diagnostics and command interface.
Technical Context
The LM3492QMH/NOPB implements a proprietary Projected-On-Time (POT) control architecture for its integrated boost converter, enabling near-constant switching frequency (200 kHz–1 MHz, set by RT resistor) and eliminating need for external compensation. The converter integrates a 3.9-A, 190-mΩ N-channel MOSFET and supports stable operation with low-ESR ceramic output capacitors-no audible noise during PWM dimming.
Its dual-channel current regulator features fast slew rate (300 ns minimum pulse width), independent DIM1/DIM2 control, ±3% LED current accuracy, and Dynamic Headroom Control (DHC) that actively minimizes VOUT to reduce power loss in the current sinks. The COMM pin provides bidirectional I/O for power-good, overtemperature, IOUT fault reporting, and channel disable commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports wide automotive battery transients and industrial DC rails without pre-regulation. |
| LED Current Accuracy | ±3% - ensures consistent brightness across channels and temperature, critical for display uniformity. |
| Dimming Contrast Ratio | 1000:1 at >3 kHz - enables high-dynamic-range backlight control with minimum 300 ns pulse width. |
| Switching Frequency Range | 200 kHz to 1 MHz - programmable via RT pin; higher frequencies allow smaller magnetics and reduced EMI footprint. |
| Integrated MOSFET RDS(on) | 0.19 Ω (typ) - reduces conduction loss and thermal stress in boost stage, supporting compact layout. |
| Junction Temp Range | –40°C to +125°C - validated for under-hood automotive environments and industrial thermal profiles. |
| Thermal Shutdown | 165°C (typ), 20°C hysteresis - protects against sustained overload while allowing recovery after cooling. |
Pinout & Package
LM3492QMH/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (7.80 mm × 4.40 mm) with exposed PowerPAD™ for improved heat dissipation. Pin functions are validated per TI SNVS656D Rev D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | Precision enable threshold (1.63 V typ); internal pullup allows direct connection to microcontroller GPIO or resistor-divider UVLO. |
| VIN | Main Input Supply | Accepts 4.5–65 V; powers both boost controller and internal LDO; requires bulk capacitance near pin. |
| SW | Switch Node | Drain of integrated 3.9-A N-MOSFET; connects to boost inductor and catch diode; high dV/dt node requiring careful layout. |
| RT | Frequency Set | Resistor-to-VOUT sets switching frequency (200 kHz–1 MHz); determines inductor size and EMI profile. |
| IREF | Current Reference | Ground-referenced pin setting LED current (50–200 mA) via single resistor; defines regulation accuracy. |
| COMM | Bidirectional I/O | Open-drain diagnostic/command interface: reports power-good, overtemp, IOUT faults; accepts frequency tuning and CH1 disable commands. |
| DIM1/CLK | Channel 1 Dimming | Active-high PWM input for CH1; doubles as clock for COMM data latching when CH1 is disabled. |
| DIM2 | Channel 2 Dimming | Independent active-high PWM input for CH2; enables true dual-string independent dimming. |
| CDHC | DHC Timing | Capacitor sets DHC response time and soft-start ramp rate; optimizes efficiency vs. transient stability trade-off. |
| LGND / PGND / GND | Separate Ground Returns | Isolates analog (LGND), power (PGND), and signal (GND) paths to prevent noise coupling into current sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Projected-On-Time (POT) Control | Eliminates loop compensation components and enables fast transient response with stable ceramic capacitor output filtering. |
| Dynamic Headroom Control (DHC) | Automatically adjusts VOUT to match minimum required LED string voltage, reducing current sink power loss by up to 40%. |
| AEC-Q100 Grade 1 Qualified | Validated for automotive ambient temperatures (–40°C to +125°C) and lifetime reliability requirements in safety-critical displays. |
| Integrated 5.5-V LDO Regulator | Supplies internal circuitry and can source up to 30 mA; enables simple biasing of COMM pullup and ILIM programming resistors. |
| Programmable Peak Current Limit | Adjustable from 2 A to 3.9 A via ILIM pin resistor, allowing optimization of inductor size and fault robustness. |
Applications
| Automotive LCD Backlight | Marine GPS Display |
|---|---|
Use Scenario: Driving two independent LED strings (e.g., 14 LEDs × 2) behind a 7-inch TFT panel in a vehicle infotainment system. IC Role / Device Role / Timing Role: Dual-channel current regulator with synchronized boost supply; manages brightness zones and compensates for LED forward-voltage drift via DHC. Use Value: Enables 1000:1 contrast ratio for daylight-readable graphics and reduces thermal load on display assembly through adaptive VOUT. | Use Scenario: Powering ruggedized 10-inch marine GPS display operating in salt-humidity environments with wide input voltage swings (9–32 V). IC Role / Device Role / Timing Role: Automotive-grade LED driver providing fault-tolerant dimming control and real-time thermal/overvoltage diagnostics via COMM pin. Use Value: Eliminates need for external watchdog or microcontroller-based protection logic; supports seamless integration with existing marine MCU firmware. |
| Industrial HMI Panel | Avionics Cabin Display |
Use Scenario: Controlling backlight intensity across dual-zone industrial human-machine interface with variable ambient light conditions. IC Role / Device Role / Timing Role: Two-channel dimmable driver with precision enable and programmable soft start; interfaces with PLC or ARM-based controller via COMM diagnostics. Use Value: Reduces BOM count by integrating boost, current regulation, and supervisory functions; simplifies compliance testing for IEC 61000-4 immunity standards. | Use Scenario: Backlighting certified cockpit display requiring DO-254 functional safety support and extended temperature operation. IC Role / Device Role / Timing Role: AEC-Q100 qualified LED driver delivering deterministic dimming timing and fault reporting for system-level health monitoring. Use Value: Supports built-in test (BIT) sequences via COMM pin commands; meets DO-160G Section 22 radiated emissions limits due to constant-frequency POT control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3492MH/NOPB | Commercial-grade version (non-AEC-Q100); identical electrical specs and pinout; lacks automotive qualification testing. | Suitable for non-automotive industrial or consumer displays where temperature range is ≤85°C ambient. | Select LM3492MH/NOPB only if AEC-Q100 qualification is not required and cost sensitivity outweighs long-term reliability validation needs. |
| TPS61165DRVR | Single-channel, 1.2-A boost LED driver; no DHC, no COMM interface, no dual-string capability; 2.7–6 V input only. | Limited to low-input-voltage portable displays; cannot replace dual-channel or high-voltage automotive use cases. | Only consider TPS61165DRVR for space-constrained single-string designs with VIN < 6 V and no diagnostic requirements. |
Compared with LM3492MH/NOPB, the LM3492QMH/NOPB adds automotive qualification and extended temperature validation without changing functionality; versus TPS61165DRVR, it provides dual-channel control, 65-V input support, and system-level diagnostics-making it uniquely suited for automotive and industrial multi-zone backlighting.
Availability
LM3492QMH/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, marine navigation displays, and industrial HMI panels requiring stable component supply, long lifecycle support, and AEC-Q100 compliance.
Supply support for LM3492QMH/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 system solutions.
The LM3492QMH/NOPB belongs to TI's automotive LED driver product line, designed specifically for high-reliability, multi-string LCD backlighting in safety-critical displays where thermal robustness, diagnostic capability, and wide input voltage tolerance are essential.
FAQ
What is the maximum total output power supported by the LM3492QMH/NOPB?
The LM3492QMH/NOPB supports up to 15 W total output power across two LED strings, with each string capable of up to 65 V output voltage and 200 mA current. This rating assumes typical thermal conditions and proper PCB layout with the exposed PowerPAD™ thermally connected to a ground plane. At full load, efficiency exceeds 85% depending on input/output voltage combinations.
Does the LM3492QMH/NOPB require external compensation components for the boost converter?
No, the LM3492QMH/NOPB uses Projected-On-Time (POT) control architecture, which eliminates the need for external compensation components. Its boost converter remains stable with ceramic output capacitors and produces no audible noise during dimming-reducing design complexity and bill-of-materials cost compared to traditional voltage-mode or current-mode controllers.
How does Dynamic Headroom Control (DHC) improve efficiency in the LM3492QMH/NOPB?
Dynamic Headroom Control (DHC) in the LM3492QMH/NOPB continuously adjusts the boost output voltage (VOUT) to match the minimum required voltage for the connected LED strings. By minimizing excess voltage across the current regulators, DHC reduces power dissipation in the linear pass elements-improving overall system efficiency by up to 40% under partial-load conditions and extending thermal margin.
Can the COMM pin of the LM3492QMH/NOPB be used for both diagnostics and command input?
Yes, the COMM pin of the LM3492QMH/NOPB is a bidirectional open-drain I/O. It reports status (power-good, overtemperature, IOUT over/undervoltage) by pulling low and accepts commands (switching frequency tuning, channel 1 disable) via externally driven pulses synchronized to the DIM1/CLK pin. This dual functionality reduces MCU GPIO usage and simplifies system-level communication.
What is the minimum dimming pulse width supported by the LM3492QMH/NOPB at high contrast ratios?
The LM3492QMH/NOPB supports a minimum dimming pulse width of 300 ns while maintaining a 1000:1 contrast ratio at dimming frequencies exceeding 3 kHz. This capability is enabled by its fast-slew-rate current regulators and precise timing control-critical for achieving high dynamic range in automotive and avionics displays where fine-grained brightness control is required.
LM3492QMH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA ~ 250mA
- Frequency:
- 200kHz ~ 1MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3492QMH/NOPB FAQ
1.How can I place an order for LM3492QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492QMH/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 LM3492QMH/NOPB reliable?
The price and inventory of LM3492QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492QMH/NOPB?
LM3492QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492QMH/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 LM3492QMH/NOPB?
For technical support, including LM3492QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492QMH/NOPB requirements.
6.How does Aetrix verify that LM3492QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492QMH/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 LM3492QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492QMH/NOPB?
All LM3492QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492QMH/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 LM3492QMH/NOPB part is unused and in its original packaging.
Return procedure for LM3492QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3492QMH/NOPB Tags
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