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Texas Instruments LM3492HCQMH/NOPB
- Part No.:
- LM3492HCQMH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492HCQMH/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
LM3492HCQMH/NOPB from Texas Instruments is a two-channel, individually dimmable LED driver IC integrating a boost converter and fast current regulators for automotive LCD backlight applications. It supports 4.5 V to 65 V input, delivers up to 65 V output, regulates LED current from 50 mA to 250 mA per channel with ±3% accuracy, and achieves 10000:1 contrast ratio via 300-ns minimum PWM dimming pulse width - used in 6.5"–10" automotive GPS displays driving up to 28 LEDs.
For engineers reviewing the LM3492HCQMH/NOPB datasheet, LM3492HCQMH/NOPB pinout, LM3492HCQMH/NOPB application, or LM3492HCQMH/NOPB equivalent, key selection considerations include its programmable 200 kHz–1 MHz switching frequency, dynamic headroom control (DHC) for efficiency optimization, COMM pin for MCU-based diagnostics and frequency tuning, integrated 3.9-A/190-mΩ N-channel MOSFET, and thermally enhanced HTSSOP-20 package with exposed thermal pad.
Technical Context
The LM3492HCQMH/NOPB employs projected-on-time (POT) control for its boost stage - eliminating loop compensation while delivering fast transient response and near-constant switching frequency. Its two independent current regulators feature fast slew rate enabling high-frequency PWM dimming and support individual channel enable/disable via DIM1/CLK and DIM2 pins.
DHC dynamically adjusts VOUT to minimize voltage headroom across each LED string, reducing power loss in the current regulator and maximizing efficiency. The COMM pin provides bidirectional open-drain interface for real-time status reporting (power-good, overtemperature, IOUT over/undervoltage) and command reception (frequency tuning, Channel 1 disable), all without latching off operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Max Output Voltage | 65 V - enables driving up to 28-series white LEDs at typical forward voltage (~2.3 V per LED). |
| LED Current Range | 50 mA to 250 mA per channel - set by single IREF resistor; ±3% accuracy ensures consistent brightness across strings. |
| Dimming Contrast Ratio | 10000:1 - achieved via 300-ns minimum PWM pulse width, enabling ultra-high-resolution grayscale in infotainment displays. |
| Switching Frequency | 200 kHz to 1 MHz - programmable via RT resistor; stable ceramic capacitor operation eliminates audible noise. |
| Integrated MOSFET | 3.9-A peak / 190-mΩ RDS(on) - reduces external component count and PCB footprint in space-constrained automotive modules. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
LM3492HCQMH/NOPB is housed in a thermally enhanced HTSSOP-20 (PWP) package measuring 6.50 mm × 4.40 mm with an exposed thermal pad for efficient heat dissipation in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Precision threshold (1.63 V typ.) allows direct connection to microcontroller GPIO or resistor-divider UVLO for VIN monitoring. |
| VIN | Main power input | Accepts 4.5–65 V unregulated supply; feeds boost converter and internal LDO (VCC). |
| SW | Switch node | Drain of integrated 3.9-A N-MOSFET; connects to boost inductor and flyback diode/capacitor network. |
| RT | Frequency programming | Resistor from VOUT to RT sets switching frequency (200 kHz–1 MHz); no compensation required. |
| FB | Output voltage feedback | Senses VOUT via resistive divider; regulates boost output to maintain headroom for current regulators. |
| GND / PGND / LGND | Ground terminals | Separate analog (GND), power-switch (PGND), and current-regulator (LGND) grounds prevent noise coupling and ensure regulation stability. |
| IOUT1 / IOUT2 | LED string outputs | Current-sink outputs for two independent LED strings; each supports up to 250 mA with fast turn-on/turn-off. |
| DIM1/CLK | Channel 1 dimming & clock | Accepts PWM signal for Channel 1 dimming; also serves as data latch clock for COMM pin communication. |
| DIM2 | Channel 2 dimming | Independent PWM input for Channel 2; enables asymmetric dimming profiles between display zones. |
| COMM | Bidirectional diagnostic interface | Open-drain I/O for MCU to read fault status (overtemp, OVP/UVP) and send commands (freq tune, Ch1 disable). |
| CDHC | Dynamic headroom control | Capacitor-connected pin that sets DHC sensitivity and provides soft-start via internal 12-µA charge current. |
| IREF | Current reference setting | Resistor-to-ground programs identical LED current for both channels (50–250 mA range). |
| ILIM | Peak current limit adjust | Resistor from VCC to ILIM reduces MOSFET peak current below 3.9 A; ground = max limit. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | POT control architecture eliminates external compensation components, reducing BOM count and layout sensitivity. |
| Dynamic Headroom Control (DHC) | Automatically minimizes VOUT to match instantaneous LED forward voltage, cutting current-regulator power loss by up to 40% vs fixed-output designs. |
| 10000:1 PWM dimming | 300-ns minimum pulse width enables >16-bit grayscale resolution in display backlighting without visible flicker or banding. |
| Integrated 3.9-A MOSFET | Reduces solution size and improves reliability by eliminating discrete switch and associated gate-drive circuitry. |
| COMM pin diagnostics | Enables real-time system-level monitoring (power-good, overtemperature, IOUT faults) without additional ADC or sense resistors. |
Applications
| Automotive LCD Backlight | Marine Navigation Display |
|---|---|
Use Scenario: Driving dual-zone backlight for 8-inch automotive infotainment panel with variable ambient light and temperature. IC Role / Device Role / Timing Role: Dual-channel constant-current LED driver with independent PWM dimming and DHC for adaptive efficiency. Use Value: Maintains uniform brightness across temperature (-40°C to +125°C junction) and input voltage (6 V–16 V cranking), extending display lifetime and reducing thermal stress. |
Use Scenario: Powering ruggedized 7-inch marine GPS display exposed to salt fog, wide thermal swings, and 12/24 V battery systems. IC Role / Device Role / Timing Role: High-input-voltage LED driver with robust protection (UVLO, thermal shutdown, OVP) and diagnostic COMM interface. Use Value: Eliminates need for external pre-regulator; COMM alerts MCU to overtemperature events before shutdown, enabling graceful UI degradation. |
| Industrial HMI Panel | Avionics Cabin Display |
Use Scenario: Controlling backlight intensity in factory-floor human-machine interface with EMI-sensitive analog sensors nearby. IC Role / Device Role / Timing Role: Low-noise LED driver using ceramic capacitors and fixed-frequency POT control to avoid audible noise and narrowband EMI. Use Value: Ceramic-stable operation prevents piezoelectric whine; separate PGND/LGND/GND paths suppress current-loop interference with precision analog circuits. |
Use Scenario: Backlighting certified avionics cabin display requiring DO-160G lightning surge immunity and fail-safe diagnostics. IC Role / Device Role / Timing Role: AEC-Q100 Grade-1 qualified LED driver with power-good reporting and non-latching fault signaling via COMM pin. Use Value: Enables deterministic fault handling in safety-critical software; DHC maintains efficiency during rapid cabin temperature changes without brightness droop. |
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 |
|---|---|---|---|
| LM3492QMH/NOPB | Non-automotive grade; lacks AEC-Q100 qualification and extended temperature range (–40°C to +125°C). | Suitable only for commercial/industrial use; not approved for automotive safety-critical systems. | Select LM3492QMH/NOPB only if AEC-Q100 compliance and automotive temperature rating are unnecessary. |
| TPS61165DRVR | Single-channel, 40-V max output, no DHC or COMM interface; uses current-mode PWM control instead of POT. | Lacks dual-channel dimming, diagnostics, and dynamic efficiency optimization - requires external MCU coordination for multi-string control. | Choose TPS61165DRVR only for cost-sensitive single-string applications where DHC and diagnostics are not required. |
Compared with LM3492QMH/NOPB, the LM3492HCQMH/NOPB adds AEC-Q100 Grade-1 qualification and guaranteed operation to +125°C junction, while versus TPS61165DRVR it provides true dual-channel independent dimming, integrated diagnostics, and adaptive headroom control - making it uniquely suited for automotive display backlighting with functional safety requirements.
Availability
LM3492HCQMH/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, marine navigation displays, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM3492HCQMH/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-grade product development expertise.
The LM3492HC product line was designed specifically for high-reliability automotive LCD backlighting - integrating boost conversion, dual current regulation, diagnostics, and thermal resilience into a single AEC-Q100-qualified IC.
FAQ
What is the maximum LED string voltage supported by the LM3492HCQMH/NOPB?
The LM3492HCQMH/NOPB supports up to 65 V output voltage, sufficient to drive up to 28-series white LEDs (assuming ~2.3 V forward voltage per LED at 150 mA). This rating is confirmed in the Absolute Maximum Ratings table and validated across operating conditions in the Electrical Characteristics section of the SNVS797B datasheet.
Does the LM3492HCQMH/NOPB require external compensation components for the boost converter?
No, the LM3492HCQMH/NOPB uses projected-on-time (POT) control architecture, which eliminates the need for external compensation components. This is explicitly stated in the Features and Description sections of the datasheet and verified in the Typical Application schematic where no compensation network appears on the FB pin.
How does Dynamic Headroom Control (DHC) improve efficiency in the LM3492HCQMH/NOPB?
DHC in the LM3492HCQMH/NOPB continuously adjusts the boost output voltage to match the minimum required headroom above the LED string forward voltage. By minimizing excess voltage across the current regulators, DHC reduces power dissipation - improving overall efficiency by up to 40% compared to fixed-output boost drivers under varying thermal and aging conditions.
Can the LM3492HCQMH/NOPB drive two LED strings with different currents?
No - the LM3492HCQMH/NOPB uses a single IREF pin to set identical regulated current for both channels (50–250 mA). While dimming is independent via DIM1/CLK and DIM2, the magnitude of regulated current is matched across IOUT1 and IOUT2, as confirmed in the Electrical Characteristics table showing identical IOUT50/IOUT100/IOUT200 specifications for both channels.
What is the function of the COMM pin on the LM3492HCQMH/NOPB?
The COMM pin on the LM3492HCQMH/NOPB is a bidirectional open-drain I/O used for real-time diagnostics (power-good, overtemperature, IOUT overvoltage/undervoltage) and command reception (switching frequency tuning, Channel 1 disable). It operates without latching off the device, enabling continuous system monitoring and adaptive control via external MCU.
LM3492HCQMH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
LM3492HCQMH/NOPB FAQ
1.How can I place an order for LM3492HCQMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492HCQMH/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 LM3492HCQMH/NOPB reliable?
The price and inventory of LM3492HCQMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492HCQMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492HCQMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492HCQMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492HCQMH/NOPB?
LM3492HCQMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492HCQMH/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 LM3492HCQMH/NOPB?
For technical support, including LM3492HCQMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492HCQMH/NOPB requirements.
6.How does Aetrix verify that LM3492HCQMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492HCQMH/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 LM3492HCQMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492HCQMH/NOPB?
All LM3492HCQMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492HCQMH/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 LM3492HCQMH/NOPB part is unused and in its original packaging.
Return procedure for LM3492HCQMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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