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Texas Instruments LM3492HCMHX/NOPB
- Part No.:
- LM3492HCMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492HCMHX/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,343
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Product details
Overview
LM3492HCMHX/NOPB from Texas Instruments is a two-channel, individually dimmable LED driver IC integrating a boost converter and fast current regulators for automotive and industrial LCD backlighting. It delivers up to 15 W total output power, supports input voltages from 4.5 V to 65 V, 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.
For engineers reviewing the LM3492HCMHX/NOPB datasheet, LM3492HCMHX/NOPB pinout, LM3492HCMHX/NOPB application, or LM3492HCMHX/NOPB equivalent, this device is selected for high-voltage automotive display backlight designs requiring dynamic headroom control, diagnostic COMM interface, and stable ceramic-capacitor-based operation without loop compensation.
Technical Context
The LM3492HCMHX/NOPB employs projected-on-time (POT) control for its integrated boost converter, enabling near-constant switching frequency (200 kHz–1 MHz, set by RRT) and eliminating need for external loop compensation. Its two independent current regulators feature fast slew rate for high-frequency PWM dimming and dynamic headroom control (DHC) that minimizes IOUT-to-VOUT voltage drop to maximize efficiency.
Supervisory functions include precision enable (1.63 V threshold), bidirectional COMM pin for power-good/overtemperature/IOUT fault reporting and frequency tuning, thermal shutdown at 165°C, and programmable peak current limit (3.9 A max, adjustable via ILIM pin). The integrated 190-mΩ, 3.9-A N-channel MOSFET and 5.5-V LDO regulator (with 30-mA current limit) reduce external component count.
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 pre-regulation. |
| Max Output Power | 15 W total - drives two LED strings up to 65 V, typically 28 LEDs at 150 mA per string. |
| LED Current Accuracy | ±3% - ensures consistent brightness across channels and temperature (−40°C to +125°C). |
| Dimming Contrast Ratio | 10000:1 - achieved via 300-ns minimum PWM pulse width, enabling ultra-high-resolution grayscale control. |
| Switching Frequency Range | 200 kHz to 1 MHz - programmable via RRT, enabling EMI optimization and ceramic capacitor stability. |
| Dynamic Headroom Control | Automatically adjusts VOUT to minimum required headroom above IOUT voltage - reduces current regulator power loss and improves system efficiency. |
| Integrated MOSFET RDS(on) | 0.19 Ω (typ) - lowers conduction loss and enables compact layout with minimal external FET count. |
Pinout & Package
LM3492HCMHX/NOPB is housed in a thermally enhanced HTSSOP-20 (PWP) package measuring 6.50 mm × 4.40 mm with exposed thermal pad. Pin functions are validated per TI SNVS797B Rev B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input | Precision 1.63 V threshold with 194 mV hysteresis; internal pullup enables reliable UVLO implementation using VIN divider. |
| VIN (Pin 2) | Main power input | Accepts 4.5–65 V; powers boost stage and internal LDO; requires local ceramic bypass (CIN). |
| SW (Pin 3) | Switch node | Drain of integrated 3.9-A N-MOSFET; connects to boost inductor; requires low-inductance layout to minimize ringing. |
| VOUT (Pin 5) | Boost output sense | Sense point for nearly constant frequency control; connects to RT resistor and feedback network. |
| FB (Pin 7) | Feedback input | Regulates output voltage via resistor divider; reference range 1.05–2.5 V; 1 µA input bias enables high-impedance dividers. |
| GND (Pin 8) | Analog ground | Reference for FB, DIM, COMM; must connect directly to exposed thermal pad for signal integrity. |
| IOUT1 / IOUT2 (Pins 10 / 9) | LED string outputs | Current-regulated outputs for two independent LED strings; support up to 65 V each with <5 µA leakage at 65 V. |
| ILIM (Pin 20) | Peak current limit adjust | Reduces MOSFET peak current from 3.9 A down via external resistor to VCC; enables overcurrent tailoring for inductor selection. |
| COMM (Pin 13) | Bidirectional diagnostic I/O | Open-drain interface for MCU communication: reports power-good, overtemperature, IOUT OV/UV faults, and accepts frequency tuning commands. |
| DIM1/CLK (Pin 15) | Channel 1 dimming / clock | Accepts PWM for channel 1 dimming; also serves as latching clock for COMM data transfer when channel 1 is disabled. |
| DIM2 (Pin 16) | Channel 2 dimming | Independent PWM input for second LED string; internally pulled low by 5-µA current source. |
| IREF (Pin 12) | Current setting reference | 1.256 V (typ) reference; sets LED current for both channels via single resistor to GND (e.g., 5 kΩ → 250 mA). |
| CDHC (Pin 11) | Dynamic headroom control | Charged by 12-µA internal current source; external capacitor sets DHC response time and soft-start ramp rate. |
| PGND (Pin 17) | Power ground | Return path for MOSFET switch; must be tied to GND and exposed pad but is not internally connected to analog GND. |
| LGND (Pin 14) | Current regulator ground | Return for IOUT1/IOUT2 regulators; separate from PGND/GND to avoid noise coupling into current sensing. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Projected-on-time (POT) control architecture eliminates external compensation components and simplifies design validation. |
| Dynamic headroom control (DHC) | Reduces VOUT to minimum needed above LED string forward voltage - cuts current regulator dissipation and boosts efficiency by up to 8% at full load. |
| 10000:1 PWM dimming contrast | 300-ns minimum pulse width enables precise grayscale rendering in automotive infotainment displays without visible flicker. |
| Integrated 5.5-V LDO regulator | Provides 30-mA regulated supply for COMM pullup, ILIM bias, and internal circuitry - eliminates need for external bias rail. |
| Bidirectional COMM interface | Enables real-time diagnostics (power-good, overtemperature, IOUT OV/UV) and dynamic configuration (frequency tuning, channel disable) via MCU. |
| Thermally enhanced PWP package | 20-pin HTSSOP with exposed pad achieves 2°C/W junction-to-board thermal resistance - sustains 125°C junction under 15-W load. |
Applications
| Automotive LCD Backlight | Marine GPS Display |
|---|---|
|
Use Scenario: Driving dual 10" TFT-LCD panels in vehicle instrument clusters with variable ambient lighting conditions. IC Role / Device Role / Timing Role: Dual-channel LED driver providing independent PWM dimming per string while maintaining 10000:1 contrast across −40°C to +85°C. Use Value: Dynamic headroom control adapts VOUT to LED forward voltage drift during thermal soak, preserving >90% efficiency at full brightness. |
Use Scenario: High-brightness backlight for marine chartplotter displays exposed to salt fog and wide temperature swings. IC Role / Device Role / Timing Role: Boost-based LED driver delivering stable 150 mA per string despite 9–36 V battery input variation and 125°C junction operation. Use Value: Integrated thermal shutdown (165°C) and over-power protection prevent field failures in sealed, convection-limited enclosures. |
| Industrial HMI Panel | Medical Diagnostic Monitor |
|
Use Scenario: 7" industrial human-machine interface with touch overlay requiring flicker-free dimming and EMC compliance. IC Role / Device Role / Timing Role: Two-channel current regulator with ceramic-capacitor-stable operation and no audible noise, supporting 200–1000 Hz PWM dimming. Use Value: Near-constant 500-kHz switching frequency (set by RRT) avoids sensitive audio bands and eases EMI filter design. |
Use Scenario: DICOM-compliant medical monitor requiring precise luminance uniformity and diagnostic-grade reliability. IC Role / Device Role / Timing Role: LED driver with ±3% current accuracy and COMM-reported power-good/overtemperature status for system-level safety monitoring. Use Value: Precision enable threshold (1.63 V) enables clean power sequencing with external microcontroller, meeting IEC 62304 software safety requirements. |
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 |
|---|---|---|---|
| LM3492HC-Q1 | Automotive AEC-Q100 Grade-1 qualified; identical electrical specs and pinout; enhanced qualification testing for temperature cycling, humidity, and vibration. | Required for production automotive systems; supports extended temperature range (−40°C to +125°C) with full PPAP documentation. | Select LM3492HC-Q1 for OEM automotive programs; LM3492HCMHX/NOPB is suitable for industrial and non-safety-critical automotive aftermarkets. |
| TPS61165DRVR | Single-channel, 40-V max output, no DHC or COMM interface; uses current-mode PWM control instead of POT; lacks diagnostic reporting and dual-dimming independence. | Applicable only for single-string backlighting with lower voltage requirements; no built-in fault reporting or MCU interface capability. | Choose TPS61165DRVR only for cost-sensitive, single-string designs where diagnostics and dynamic headroom are not required. |
Compared with LM3492HC-Q1, the LM3492HCMHX/NOPB offers identical performance and pin compatibility but omits AEC-Q100 certification-making it ideal for industrial and non-OEM automotive use. Versus TPS61165DRVR, it adds dual-channel control, DHC, and COMM diagnostics at higher voltage and power capability, justifying its use in premium display systems.
Availability
LM3492HCMHX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, marine navigation displays, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3492HCMHX/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 over 50 years of innovation in automotive and industrial power solutions.
The LM3492HCMHX/NOPB belongs to TI's high-voltage LED driver product line, designed specifically for automotive-grade LCD backlighting with emphasis on efficiency, diagnostics, and robust operation across extreme input voltage ranges.
FAQ
What is the maximum LED string voltage supported by the LM3492HCMHX/NOPB?
The LM3492HCMHX/NOPB supports up to 65 V per LED string at the IOUT1 and IOUT2 pins. This allows driving longer LED strings-typically up to 28 LEDs in series at 150 mA-while maintaining regulation accuracy and thermal safety within its 15-W total power limit. The device's boost converter output can reach 65 V, and the current regulators tolerate this voltage with <5 µA leakage at rated conditions.
Does the LM3492HCMHX/NOPB require external compensation components?
No, the LM3492HCMHX/NOPB does not require external compensation components. Its boost converter uses projected-on-time (POT) control, which inherently provides fast transient response and stable operation with ceramic output capacitors-eliminating the need for traditional Type-II or Type-III compensation networks and reducing bill-of-materials count.
How does dynamic headroom control (DHC) improve efficiency in the LM3492HCMHX/NOPB?
Dynamic headroom control (DHC) in the LM3492HCMHX/NOPB continuously adjusts the boost output voltage (VOUT) to the minimum level required above the instantaneous forward voltage of each LED string. By minimizing the voltage drop across the current regulators, DHC reduces their power dissipation-improving overall system efficiency by up to 8% at full load and enabling smaller thermal design margins.
Can the LM3492HCMHX/NOPB drive two LED strings with different numbers of LEDs?
Yes, the LM3492HCMHX/NOPB supports independent current regulation on IOUT1 and IOUT2, allowing different LED counts per string. Each channel regulates current based on its own IREF-set value and responds to its respective DIM1 or DIM2 signal. DHC operates per channel, adapting VOUT to the higher of the two string voltages-enabling flexible BOM reuse across display sizes.
What diagnostic functions are accessible via the COMM pin on the LM3492HCMHX/NOPB?
The COMM pin on the LM3492HCMHX/NOPB provides open-drain diagnostic reporting for power-good status, overtemperature condition (TJ ≥135°C), and IOUT overvoltage/undervoltage faults. It also accepts commands from an external MCU-including switching frequency tuning and channel-1 disable-enabling real-time system monitoring and adaptive control without additional GPIO resources.
LM3492HCMHX/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
LM3492HCMHX/NOPB FAQ
1.How can I place an order for LM3492HCMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492HCMHX/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 LM3492HCMHX/NOPB reliable?
The price and inventory of LM3492HCMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492HCMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492HCMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492HCMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492HCMHX/NOPB?
LM3492HCMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492HCMHX/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 LM3492HCMHX/NOPB?
For technical support, including LM3492HCMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492HCMHX/NOPB requirements.
6.How does Aetrix verify that LM3492HCMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492HCMHX/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 LM3492HCMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492HCMHX/NOPB?
All LM3492HCMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492HCMHX/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 LM3492HCMHX/NOPB part is unused and in its original packaging.
Return procedure for LM3492HCMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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