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Texas Instruments LM3492MHX/NOPB
- Part No.:
- LM3492MHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492MHX/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,486
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Product details
Overview
LM3492MHX/NOPB from Texas Instruments is a two-channel individual dimmable LED driver IC integrating a boost converter and fast current regulators for driving up to 28 LEDs per string at 150 mA, supporting input voltages from 4.5 V to 65 V, output voltage up to 65 V, and 1000:1 contrast ratio at >3 kHz dimming frequency - used in automotive GPS display backlighting.
For engineers reviewing the LM3492MHX/NOPB datasheet, LM3492MHX/NOPB pinout, LM3492MHX/NOPB application, or LM3492MHX/NOPB equivalent, key selection considerations include programmable switching frequency (200 kHz–1 MHz), ±3% LED current accuracy, Dynamic Headroom Control for efficiency optimization, and COMM pin diagnostic interface for MCU integration.
Technical Context
The LM3492MHX/NOPB employs Projected-On-Time (POT) control for its integrated boost converter, eliminating loop compensation while maintaining near-constant switching frequency across input/output variations. It integrates a 3.9-A, 190-mΩ N-channel MOSFET switch and supports ceramic output capacitors without audible noise.
Its dual-channel current regulator delivers fast slew-rate response enabling 300 ns minimum dimming pulse width and 1000:1 contrast ratio. Dynamic Headroom Control (DHC) dynamically adjusts FB threshold (1.05 V–2.5 V) based on IOUT voltage to minimize power loss in the current regulator, and the bidirectional COMM pin provides real-time status reporting (power-good, overtemperature, IOUT OV/UV) and command reception (frequency tuning, channel disable).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V - enables direct connection to automotive battery (9–16 V nominal) and industrial 24/48 V rails without pre-regulation. |
| LED Current Accuracy | ±3% - ensures consistent brightness across strings and temperature, critical for uniform LCD backlighting. |
| Dimming Contrast Ratio | 1000:1 at >3 kHz - supports high-dynamic-range video content with minimal flicker in automotive displays. |
| Switching Frequency Range | 200 kHz to 1 MHz - allows EMI optimization and compact magnetics; set via external RT resistor. |
| Integrated MOSFET RDS(on) | 0.19 Ω (typ) - reduces conduction loss and thermal stress, enabling 15 W total output in HTSSOP package. |
| DHC Sensitivity Control | External CDHC capacitor - sets DHC response time and soft-start ramp rate; avoids output overshoot during startup. |
| Thermal Shutdown Threshold | 165 °C (typ), 20 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
| COMM Pin Functionality | Bidirectional open-drain I/O - enables MCU-based fault monitoring and dynamic configuration without additional level-shifting circuitry. |
Pinout & Package
LM3492MHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 7.80 mm × 4.40 mm with exposed thermal pad (DAP) for PCB-level heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | Precision enable threshold (1.63 V typ); internal 40 µA pullup enables clean UVLO implementation with resistor divider from VIN. |
| VIN | Main Power Input | Accepts 4.5–65 V unregulated supply; powers boost stage and internal LDO (VCC). |
| SW | Switch Node | Drain of integrated 3.9-A N-MOSFET; connects to boost inductor and flyback diode/capacitor network. |
| VOUT | Output Voltage Sense | Sense point for POT control timing; sets nearly constant switching frequency independent of load transients. |
| RT | Frequency Programming | Resistor-to-VOUT sets switching frequency (200 kHz–1 MHz); no compensation required. |
| FB | Feedback Input | Regulates output voltage; DHC modulates its threshold (1.05–2.5 V) to minimize headroom loss in current regulator. |
| GND / LGND / PGND | Ground Terminals | Separate analog (GND), current-regulator (LGND), and power-switch (PGND) grounds prevent noise coupling and ensure stable regulation. |
| IOUT1 / IOUT2 | LED String Outputs | High-side current sink outputs; each drives one LED string up to 65 V with programmable 50–200 mA current. |
| IREF | Current Reference | Resistor-to-GND programs LED current for both channels simultaneously (±3% accuracy). |
| COMM | Bidirectional Diagnostic I/O | Open-drain pin reports faults (overtemp, IOUT OV/UV, power-good) and accepts commands (freq tune, ch1 disable). |
| DIM1 / DIM2 | Dimming Inputs | Independent PWM inputs; DIM1 also serves as clock for COMM data latching when channel 1 is disabled. |
| CDHC | DHC & Soft-Start Control | Capacitor sets DHC sensitivity and soft-start ramp; internal 120 µA current source charges it at startup. |
| ILIM | Peak Current Limit Adjust | Resistor-to-VCC reduces MOSFET peak current limit (3.9 A max) for inductor saturation margin or thermal derating. |
| VCC | LDO Output | 5.5 V regulated output (30 mA max); powers internal circuitry and can bias COMM pullup or ILIM programming. |
| DAP | Exposed Thermal Pad | Must be soldered to PCB ground plane; critical for achieving RθJA = 36.5 °C/W and sustaining 15 W operation. |
Key Features
| Feature | Design Value |
|---|---|
| No Loop Compensation Required | Projected-On-Time (POT) control architecture eliminates external compensation components and simplifies layout for stable operation with ceramic output caps. |
| Dynamic Headroom Control (DHC) | Automatically minimizes VOUT–VLED differential to reduce power loss in current regulator, improving efficiency by up to 15% vs fixed-output boost drivers. |
| 1000:1 High-Frequency Dimming | Fast current regulator supports 300 ns minimum pulse width at >3 kHz, enabling flicker-free, high-contrast video playback in automotive infotainment displays. |
| Integrated 3.9-A MOSFET | Reduces BOM count and board space; 190 mΩ RDS(on) limits conduction loss even at full 200 mA per channel (15 W total). |
| COMM Pin Diagnostics | Single-wire bidirectional interface replaces multiple discrete fault signals, reducing MCU GPIO usage and simplifying system-level fault logging. |
| Thermally Enhanced HTSSOP | 20-pin PWP package with exposed DAP achieves 36.5 °C/W junction-to-ambient thermal resistance - validated for continuous 125 °C ambient operation. |
Applications
| Automotive GPS Display Backlight | Marine Navigation Panel Lighting |
|---|---|
Use Scenario: Driving dual 14-LED strings (28 total) in a 7-inch TFT-LCD panel for marine chartplotter with wide temperature (-40°C to +85°C) and vibration requirements. IC Role / Device Role / Timing Role: LM3492MHX/NOPB acts as primary LED driver, providing regulated current to both strings while dynamically adjusting VOUT via DHC to compensate for LED forward voltage drift during extended operation. Use Value: Enables consistent brightness and color uniformity across display lifetime, with 1000:1 contrast preserving detail in low-light navigation scenes. | Use Scenario: Backlighting a ruggedized 10-inch sunlight-readable LCD in a marine multifunction display exposed to salt fog and 12–32 V DC input variation. IC Role / Device Role / Timing Role: LM3492MHX/NOPB functions as fault-tolerant LED controller, using COMM pin diagnostics to report overtemperature events and IOUT undervoltage conditions to host MCU for adaptive dimming or shutdown. Use Value: Eliminates need for external thermal sensors or voltage monitors, reducing system cost and improving reliability in harsh maritime environments. |
| Industrial HMI Display Backlight | Commercial Vehicle Infotainment |
Use Scenario: Powering dual LED strings in a factory-floor human-machine interface panel requiring EMC compliance and long-term luminance stability. IC Role / Device Role / Timing Role: LM3492MHX/NOPB serves as EMI-optimized LED driver with programmable 500 kHz switching frequency and ceramic-capacitor compatibility, minimizing conducted emissions. Use Value: Achieves Class B EMC performance without ferrite beads or shielding, accelerating CE certification for industrial equipment. | Use Scenario: Backlighting a 9-inch dashboard display in a heavy-duty truck with 24 V nominal battery and transient spikes up to ±65 V. IC Role / Device Role / Timing Role: LM3492MHX/NOPB operates as robust LED driver with 65 V absolute max input rating and built-in over-power protection, surviving load-dump transients without external TVS. Use Value: Reduces system-level protection components and improves field failure MTBF in commercial vehicle applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3492Q1MHX/NOPB | AEC-Q100 Grade 1 qualified; identical electrical specs but automotive-qualified process, tighter temp range (–40°C to +125°C), and enhanced ESD (±2000 V HBM). | Required for production automotive systems; not necessary for industrial or marine non-safety-critical use. | Select LM3492Q1MHX/NOPB only if AEC-Q100 qualification is mandated by OEM or safety standard. |
| TPS61165DRVR | Single-channel, 40-V max output, no DHC, no COMM pin, lower max current (120 mA), no programmable frequency. | Suitable for simpler, cost-sensitive single-string applications where diagnostics and dynamic efficiency optimization are not needed. | Choose TPS61165DRVR only for low-complexity designs with ≤40 V LED strings and no requirement for multi-channel dimming or MCU telemetry. |
Compared with LM3492Q1MHX/NOPB, the LM3492MHX/NOPB offers identical performance at lower qualification cost, while TPS61165DRVR trades dual-channel capability, DHC, and diagnostics for reduced footprint and BOM count in less demanding applications.
Availability
LM3492MHX/NOPB is available at Aetrix Electronics and suitable for automotive GPS displays, marine navigation panels, industrial HMIs, and commercial vehicle infotainment systems requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM3492MHX/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 experience in automotive and industrial power solutions.
The LM3492MHX/NOPB belongs to TI's high-efficiency LED driver product line, designed specifically for automotive-grade display backlighting with emphasis on thermal resilience, diagnostic capability, and wide-input-voltage operation.
FAQ
What is the maximum LED string voltage supported by the LM3492MHX/NOPB?
The LM3492MHX/NOPB supports up to 65 V output voltage per LED string, enabling configurations of up to 28 white LEDs (2.3 V typical VF) in series. This is confirmed in the datasheet's "Description" section and "Absolute Maximum Ratings" table, where VOUT to GND is rated to 67 V. The device maintains regulation and dimming functionality across this full range when paired with appropriate external components.
Does the LM3492MHX/NOPB require external compensation components for the boost converter?
No, the LM3492MHX/NOPB does not require external compensation components. Its boost converter uses Projected-On-Time (POT) control, which inherently provides stability with ceramic output capacitors and eliminates the need for traditional Type II or III compensation networks. This is explicitly stated in the "Features" list and verified in Section 8.1 "Overview" of the datasheet.
How is LED current programmed on the LM3492MHX/NOPB?
LED current on the LM3492MHX/NOPB is programmed using a single external resistor connected from the IREF pin to GND. The datasheet specifies that this resistor sets the current for both channels simultaneously, with values of 25 kΩ, 12.5 kΩ, and 6.25 kΩ yielding nominal currents of 50 mA, 100 mA, and 200 mA respectively. Current accuracy is ±3% over temperature and line, as confirmed in Section 7.5 "Electrical Characteristics".
What is the role of the COMM pin on the LM3492MHX/NOPB?
The COMM pin on the LM3492MHX/NOPB is a bidirectional open-drain logic I/O that serves two roles: (1) reporting status (power-good, overtemperature, IOUT overvoltage/undervoltage) and (2) receiving commands (switching frequency tuning, channel 1 disable). It interfaces directly with an external MCU without level shifters, as detailed in the "Pin Functions" table and Section 8.3.6 of the datasheet.
Can the LM3492MHX/NOPB operate from a 24 V industrial supply?
Yes, the LM3492MHX/NOPB is fully compatible with 24 V industrial supplies. Its input voltage range is specified as 4.5 V to 65 V in both "Features" and "Recommended Operating Conditions", and typical application circuits in the datasheet validate operation at 12 V and 24 V inputs. The device's robust 67 V absolute maximum rating provides margin against transients common in industrial 24 V systems.
LM3492MHX/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3492MHX/NOPB FAQ
1.How can I place an order for LM3492MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492MHX/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 LM3492MHX/NOPB reliable?
The price and inventory of LM3492MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492MHX/NOPB?
LM3492MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492MHX/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 LM3492MHX/NOPB?
For technical support, including LM3492MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492MHX/NOPB requirements.
6.How does Aetrix verify that LM3492MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492MHX/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 LM3492MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492MHX/NOPB?
All LM3492MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492MHX/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 LM3492MHX/NOPB part is unused and in its original packaging.
Return procedure for LM3492MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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