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Texas Instruments LM3492HCMH/NOPB
- Part No.:
- LM3492HCMH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492HCMH/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:102
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Product details
Overview
LM3492HCMH/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 backlight applications. It delivers up to 15 W total output power, supports 4.5 V to 65 V input, 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 LM3492HCMH/NOPB datasheet, LM3492HCMH/NOPB pinout, LM3492HCMH/NOPB application, or LM3492HCMH/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 LM3492HCMH/NOPB uses projected-on-time (POT) control for the boost stage-determining MOSFET on-time based on VIN, VOUT, and RRT-to deliver near-constant frequency operation without loop compensation. Its two independent current regulators feature fast slew rate enabling high-frequency PWM dimming and DHC-driven adaptive output voltage adjustment to minimize regulator power loss.
Supervisory functions include precision enable (1.63 V threshold), VCC UVLO (3.78 V), over-power protection, thermal shutdown (165 °C), and bidirectional COMM pin for real-time status reporting (power-good, overtemperature, IOUT over/undervoltage) and command reception (channel disable, frequency tuning).
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. |
| Max Output Power | 15 W total - enables dual-string backlight driving for 6.5"–10" displays with up to 28 LEDs (e.g., 14 per string at 150 mA). |
| LED Current Accuracy | ±3% - ensures consistent brightness across channels and temperature (−40 °C to +125 °C junction). |
| Switching Frequency | 200 kHz to 1 MHz - set by RRT resistor; enables ceramic capacitor use and eliminates audible noise in dimming. |
| Contrast Ratio | 10000:1 - achieved via 300-ns minimum PWM pulse width and fast current regulator response. |
| Integrated MOSFET | 3.9-A peak / 190-mΩ RDS(on) - reduces external component count and PCB footprint in boost stage. |
| DHC Sensitivity | Adjustable via CDHC capacitor - dynamically minimizes VOUT headroom to maximize system efficiency under varying LED VF. |
Pinout & Package
LM3492HCMH/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.50 mm × 4.40 mm with an exposed thermal pad for efficient heat dissipation. The package is RoHS-compliant and lead-free (NOPB suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input | Precision 1.63 V threshold with 194 mV hysteresis; internal pullup enables clean start-up and noise immunity. |
| VIN (Pin 2) | Main power input | Accepts 4.5–65 V supply; feeds boost converter and internal LDO; requires local CIN decoupling. |
| SW (Pin 3) | Switch node | Drain of integrated N-MOSFET; connects to boost inductor; high dv/dt node requiring careful layout. |
| RT (Pin 6) | Frequency programming | Resistor-to-VOUT sets switching frequency (200 kHz–1 MHz); determines timing for POT control. |
| FB (Pin 7) | Output voltage feedback | Senses VOUT via resistor divider; reference range 1.05–2.5 V; used for constant-frequency regulation. |
| GND (Pin 8) | Analog ground | Reference for FB, DIM, COMM; must connect directly to exposed thermal pad for signal integrity. |
| IOUT1 / IOUT2 (Pins 9–10) | LED string outputs | Current-regulated outputs for two independent LED strings; each supports up to 250 mA with DHC tracking. |
| ILIM (Pin 20) | Peak current limit adjust | Resistor-to-VCC reduces MOSFET peak current from 3.9 A down; grounding yields maximum limit. |
| COMM (Pin 13) | Bidirectional diagnostic interface | Open-drain I/O for MCU communication: reports faults (overtemp, OVP/UVP) and accepts commands (freq tune, ch1 disable). |
| CDHC (Pin 11) | DHC soft-start control | Capacitor sets DHC sensitivity and provides soft-start via 12-µA internal charge current. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | POT control architecture eliminates external compensation components, reducing BOM count and design iteration time. |
| Dynamic Headroom Control (DHC) | Automatically adjusts VOUT to match minimum required headroom across LED VF drift, improving efficiency by >5% at partial load. |
| Stable with ceramic capacitors | Eliminates electrolytic capacitors and audible noise in backlight systems, enhancing reliability and acoustic performance. |
| 10000:1 contrast ratio | Enabled by 300-ns minimum PWM pulse width and fast current regulator slew rate-critical for high-end automotive display grading. |
| Integrated 5.5-V LDO | Supplies 30-mA regulated VCC for internal circuitry and external COMM pullup; stable with ≥0.47 µF CVCC. |
Applications
| Automotive LCD Backlight | Marine GPS Display |
|---|---|
Use Scenario: Driving dual LED strings in a 7-inch automotive infotainment display with variable ambient lighting and thermal cycling. IC Role / Device Role / Timing Role: Dual-channel LED current regulator with DHC and COMM-based diagnostics, synchronized to vehicle MCU via DIM1/CLK and COMM. Use Value: Maintains consistent brightness and contrast (10000:1) across −40 °C to +105 °C ambient while reducing power loss via adaptive VOUT control. |
Use Scenario: High-reliability backlight for marine chartplotter operating in humid, salt-spray environments with wide input voltage swings (9–32 V). IC Role / Device Role / Timing Role: Boost-based LED driver with precision enable and thermal shutdown, supporting extended runtime on battery or alternator supply. Use Value: Delivers stable 150 mA per string with ±3% accuracy and no audible noise-critical for silent bridge navigation environments. |
| Industrial HMI Panel | Medical Diagnostic Display |
Use Scenario: Operator interface panel in factory automation equipment requiring ESD-hardened, long-lifetime backlighting. IC Role / Device Role / Timing Role: Two-channel dimmable LED driver with HBM ±2000 V ESD rating and COMM-based fault logging for predictive maintenance. Use Value: Enables remote brightness calibration and thermal monitoring via COMM interface, reducing field service visits. |
Use Scenario: High-contrast imaging display in portable ultrasound or patient monitor where grayscale fidelity and flicker-free dimming are critical. IC Role / Device Role / Timing Role: Fast-response current regulator supporting 200 Hz+ PWM dimming with sub-microsecond edge control. Use Value: Achieves artifact-free grayscale rendering via 10000:1 contrast and eliminates visible PWM ripple through ceramic-capacitor stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3492HC-Q1 | Automotive AEC-Q100 Grade-1 qualified; identical electrical specs but validated for −40 °C to +125 °C operation with enhanced reliability testing. | Required for production automotive systems; not suitable for cost-sensitive industrial designs lacking qualification requirements. | Select LM3492HC-Q1 when AEC-Q100 compliance is mandated; LM3492HCMH/NOPB is optimal for non-automotive industrial or medical use. |
| TPS61165DRVR | Single-channel, 40-V max output, no DHC or COMM interface; 1.2-MHz fixed frequency; lacks dual-string independence and diagnostic capability. | Suitable only for simpler single-string backlighting; cannot replace dual-dimmable functionality or MCU communication needs. | Use TPS61165DRVR only if application requires single-output, lower-cost solution without diagnostics or adaptive efficiency features. |
Compared with LM3492HC-Q1, the LM3492HCMH/NOPB offers identical performance in non-automotive environments at lower cost and qualification overhead; versus TPS61165DRVR, it provides true dual-channel dimming, DHC-driven efficiency gains, and robust diagnostic integration-making it essential for complex, high-reliability displays.
Availability
LM3492HCMH/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 RoHS-compliant packaging.
Supply support for LM3492HCMH/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 IC development expertise.
The LM3492HCMH/NOPB belongs to TI's high-efficiency LED driver product line, designed specifically for demanding backlight applications requiring dual-channel dimming, wide input range, and intelligent thermal/power supervision.
FAQ
What is the maximum LED string voltage supported by the LM3492HCMH/NOPB?
The LM3492HCMH/NOPB supports up to 65 V output voltage, enabling driving of longer LED strings-such as 28 LEDs at typical VF (2.3 V each)-in a single string per channel. This is enforced by internal overvoltage protection on the IOUT pins and verified across the full operating temperature range (−40 °C to +125 °C).
How does Dynamic Headroom Control (DHC) improve efficiency in the LM3492HCMH/NOPB?
DHC in the LM3492HCMH/NOPB continuously adjusts the boost converter's output voltage (VOUT) to match the minimum required headroom above the LED string forward voltage (VF). By minimizing excess voltage across the current regulator, DHC reduces power dissipation-typically improving system efficiency by 5–8% at partial load compared to fixed-VOUT architectures.
Can the LM3492HCMH/NOPB drive two different LED string lengths simultaneously?
Yes-the LM3492HCMH/NOPB independently regulates current on IOUT1 and IOUT2, allowing different numbers of LEDs per string. DHC operates per channel, so VOUT adapts to the higher VF string while maintaining precise current in both. This enables single-BOM flexibility across display sizes (e.g., 14-LED vs. 20-LED panels) without redesign.
What is the role of the COMM pin on the LM3492HCMH/NOPB?
The COMM pin on the LM3492HCMH/NOPB is a bidirectional open-drain interface for MCU communication. It reports real-time status (power-good, overtemperature, IOUT over/undervoltage) and accepts commands (switching frequency tuning, Channel 1 disable). No additional level-shifting or protocol ICs are needed-simplifying system-level diagnostics and control.
Does the LM3492HCMH/NOPB require external compensation components?
No-the LM3492HCMH/NOPB uses projected-on-time (POT) control for its boost converter, eliminating the need for external compensation networks. This simplifies layout, reduces component count, and ensures stable operation with ceramic output capacitors-avoiding audible noise and improving reliability over electrolytic alternatives.
LM3492HCMH/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3492HCMH/NOPB FAQ
1.How can I place an order for LM3492HCMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492HCMH/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 LM3492HCMH/NOPB reliable?
The price and inventory of LM3492HCMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492HCMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492HCMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492HCMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492HCMH/NOPB?
LM3492HCMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492HCMH/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 LM3492HCMH/NOPB?
For technical support, including LM3492HCMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492HCMH/NOPB requirements.
6.How does Aetrix verify that LM3492HCMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492HCMH/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 LM3492HCMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492HCMH/NOPB?
All LM3492HCMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492HCMH/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 LM3492HCMH/NOPB part is unused and in its original packaging.
Return procedure for LM3492HCMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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