My Inquiry
My Account
Texas Instruments LM3492QMHX/NOPB
- Part No.:
- LM3492QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492QMHX/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,122
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3492QMHX/NOPB from Texas Instruments is an automotive-grade, two-channel LED driver IC integrating a boost converter and fast current regulators for individually dimmable LED strings up to 65 V and 15 W total. It delivers ±3% LED current accuracy, 1000:1 contrast ratio at >3 kHz dimming, and operates from 4.5 V to 65 V input with programmable 200 kHz–1 MHz switching frequency.
For engineers reviewing the LM3492QMHX/NOPB datasheet, LM3492QMHX/NOPB pinout, LM3492QMHX/NOPB application, or LM3492QMHX/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification, dynamic headroom control for efficiency optimization, bidirectional COMM pin for diagnostics and command interface, and integrated 3.9-A/190-mΩ N-channel MOSFET eliminating external switch requirements.
Technical Context
The LM3492QMHX/NOPB employs Projected-On-Time (POT) control for its boost stage-enabling no-loop-compensation operation, fast transient response, and near-constant switching frequency set by an external RT resistor. Its two independent current regulators support high-speed PWM dimming down to 300 ns pulse width while maintaining tight current matching across channels.
Dynamic Headroom Control (DHC) actively adjusts the boost output voltage to match the minimum required headroom above the LED string forward voltage, reducing power dissipation in the current regulators. The COMM pin provides bidirectional communication for real-time status reporting (power-good, overtemperature, IOUT OV/UV) and commands (frequency tuning, channel disable), all without latching shutdown behavior.
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 supplies without external pre-regulation. |
| LED Current Accuracy | ±3% - ensures consistent brightness and color balance across dual LED strings in display backlighting. |
| Dimming Contrast Ratio | 1000:1 at >3 kHz - enables ultra-high-contrast LCD backlighting with minimal visible flicker. |
| Switching Frequency Range | 200 kHz to 1 MHz - programmable via RT resistor; avoids AM radio band and enables compact magnetics. |
| Integrated MOSFET | 3.9-A peak / 190-mΩ RDS(on) - reduces BOM count and PCB area; eliminates need for external high-current switch. |
| Thermal Shutdown | 165°C (typical) with 20°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C ambient) - qualified for under-hood and instrument cluster applications. |
Pinout & Package
LM3492QMHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (7.80 mm × 4.40 mm) with exposed PowerPAD™ for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | Precision enable threshold (1.63 V typ); supports input UVLO implementation via resistor divider. |
| VIN | Main Input Supply | Accepts 4.5–65 V; powers internal circuitry and boost stage; handles load dump transients. |
| SW | Switch Node | Drain of integrated N-MOSFET; connects to boost inductor and output capacitor. |
| VOUT | Output Voltage Sense | Sense point for boost regulation; sets switching frequency reference via RT resistor. |
| IOUT1 / IOUT2 | LED String Outputs | High-side current regulator outputs; each drives one LED string up to 65 V with independent dimming. |
| IREF | Current Setting Reference | Resistor-to-ground sets identical LED current (50–200 mA) for both channels. |
| COMM | Bidirectional Diagnostic/Control | Open-drain I/O for power-good, overtemp, fault reporting, and command reception (e.g., channel disable). |
| DIM1 / DIM2 | Independent Dimming Inputs | CMOS-compatible PWM inputs; DIM1 also serves as clock for COMM data latching. |
| CDHC | DHC Timing & Soft-Start | Capacitor connection sets DHC response time and controls soft-start ramp rate. |
| PGND / LGND / GND | Separate Ground Returns | Isolates power, current-regulator, and analog grounds to minimize noise coupling and improve stability. |
Key Features
| Feature | Design Value |
|---|---|
| No-loop-compensation boost control | Projected-On-Time (POT) architecture eliminates external compensation components and simplifies layout. |
| Dynamic Headroom Control (DHC) | Reduces boost output voltage to minimum required headroom, cutting current-regulator losses and improving system efficiency by up to 15%. |
| 1000:1 high-frequency dimming | Supports >3 kHz PWM with 300 ns minimum pulse width-critical for flicker-free, high-contrast automotive displays. |
| Bidirectional COMM interface | Enables MCU-based health monitoring and runtime reconfiguration (e.g., frequency tuning, channel disable) without additional GPIOs. |
| Integrated 3.9-A MOSFET | Eliminates external high-current switch; reduces solution size and improves reliability in space-constrained modules. |
Applications
| Automotive Instrument Cluster Backlight | Marine GPS Display Lighting |
|---|---|
Use Scenario: Driving dual LED strings behind TFT-LCD in vehicle dashboards with variable ambient lighting and temperature extremes. IC Role / Device Role / Timing Role: Dual-channel LED driver providing independent brightness control, thermal derating, and diagnostic feedback to MCU via COMM pin. Use Value: AEC-Q100 Grade 1 qualification ensures reliable operation from −40°C to +125°C; DHC maintains efficiency despite LED VF drift over temperature. | Use Scenario: Illuminating ruggedized marine GPS displays exposed to salt, humidity, and wide input voltage swings (e.g., 9–32 V battery systems). IC Role / Device Role / Timing Role: High-voltage boost LED driver with overvoltage/undervoltage fault reporting and robust ESD protection (±2 kV HBM). Use Value: 65 V max output supports long LED strings; 4.5–65 V input range accommodates unregulated marine battery sources without external pre-regulators. |
| Industrial HMI Panel Backlight | Avionics Cabin Display Lighting |
Use Scenario: Powering 28-LED backlight arrays in factory-floor HMIs requiring high contrast, low EMI, and long service life. IC Role / Device Role / Timing Role: Two-channel constant-current regulator with ceramic-capacitor-stable boost and no-audible-noise operation. Use Value: Stable with low-ESR ceramics eliminates piezoelectric noise; ±3% current accuracy ensures uniform panel luminance across production units. | Use Scenario: Driving redundant LED backlights in certified avionics displays where fault detection and graceful degradation are mandatory. IC Role / Device Role / Timing Role: Diagnostics-enabled LED driver with power-good, overtemperature, and IOUT OV/UV reporting via open-drain COMM pin. Use Value: Real-time fault telemetry allows flight-critical software to initiate backup lighting or alert maintenance-without device latch-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3492MHX/NOPB | Commercial-grade version (non-AEC-Q100); identical electrical specs and pinout. | Lacks automotive qualification; unsuitable for safety-critical or temperature-extended environments. | Select LM3492MHX/NOPB only for non-automotive industrial or consumer applications where Grade 1 qualification is unnecessary. |
| TPS61165DRVR | Single-channel, 40-V max output, no DHC or COMM interface; requires external MOSFET for >40 V. | Lower integration; lacks dual-channel dimming, diagnostics, and automotive qualification. | Choose TPS61165DRVR only for cost-sensitive, single-string designs below 40 V with no diagnostic requirements. |
Compared with LM3492MHX/NOPB, the LM3492QMHX/NOPB adds AEC-Q100 Grade 1 compliance and extended temperature validation-critical for automotive deployment-while sharing identical functionality and layout. Against TPS61165DRVR, it offers dual-channel control, higher 65-V output, integrated MOSFET, and full diagnostic capability-justifying its use in premium display systems demanding reliability and intelligence.
Availability
LM3492QMHX/NOPB is available at Aetrix Electronics and suitable for automotive instrument clusters, marine GPS displays, and industrial HMI panels requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LM3492QMHX/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 decades of automotive IC expertise.
The LM3492QMHX/NOPB belongs to TI's automotive LED driver product line, engineered specifically for high-reliability, high-contrast LCD backlighting in safety-critical vehicle displays and harsh-environment instrumentation.
FAQ
What is the operating temperature range for the LM3492QMHX/NOPB?
The LM3492QMHX/NOPB is qualified per AEC-Q100 Grade 1, supporting continuous operation from −40°C to +125°C ambient temperature. Its thermal shutdown activates at 165°C junction temperature with 20°C hysteresis, ensuring robustness in under-hood and sealed display module environments. This rating is validated and documented in the official TI SNVS656D datasheet.
Does the LM3492QMHX/NOPB require external compensation components?
No, the LM3492QMHX/NOPB uses Projected-On-Time (POT) control for its boost converter, eliminating the need for external loop compensation components. This architecture ensures stability with ceramic output capacitors and prevents audible noise during dimming-verified in TI's typical application circuits and electrical characteristics tables.
How does Dynamic Headroom Control (DHC) improve efficiency in the LM3492QMHX/NOPB?
DHC in the LM3492QMHX/NOPB continuously adjusts the boost output voltage to match the minimum headroom required above the LED string forward voltage. By minimizing excess voltage across the current regulators, DHC reduces power dissipation-typically improving system efficiency by up to 15%-and enables single-BOM flexibility across varying LED string counts, as confirmed in Section 5 of the SNVS656D datasheet.
Can the LM3492QMHX/NOPB drive LED strings above 65 V?
No-the LM3492QMHX/NOPB is rated for a maximum output voltage of 65 V, as specified in its Absolute Maximum Ratings (Section 7.1) and Recommended Operating Conditions (Section 7.3). Exceeding this voltage risks permanent damage. For higher-voltage applications, TI recommends evaluating alternative architectures such as cascaded boost stages or dedicated high-voltage LED drivers.
What functions does the COMM pin support on the LM3492QMHX/NOPB?
The COMM pin on the LM3492QMHX/NOPB is a bidirectional open-drain interface supporting power-good indication, overtemperature alerts, IOUT overvoltage/undervoltage detection, switching frequency tuning, and channel-1 disabling-all communicated via defined logic states and timing protocols detailed in Sections 6 and 8.3.6 of the SNVS656D datasheet.
LM3492QMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM3492QMHX/NOPB FAQ
1.How can I place an order for LM3492QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492QMHX/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 LM3492QMHX/NOPB reliable?
The price and inventory of LM3492QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492QMHX/NOPB?
LM3492QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492QMHX/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 LM3492QMHX/NOPB?
For technical support, including LM3492QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492QMHX/NOPB requirements.
6.How does Aetrix verify that LM3492QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492QMHX/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 LM3492QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492QMHX/NOPB?
All LM3492QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492QMHX/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 LM3492QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM3492QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3492QMHX/NOPB Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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…
