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Texas Instruments LM3492MH/NOPB
- Part No.:
- LM3492MH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492MH/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,488
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Product details
Overview
LM3492MH/NOPB from Texas Instruments is a two-channel, individually dimmable LED driver IC integrating a boost converter and fast current regulators for driving up to 28 LEDs (15 W total, 65 V max output) with ±3% LED current accuracy, 1000:1 contrast ratio at >3 kHz dimming, and programmable 200 kHz–1 MHz switching frequency. It serves as the core power and dimming controller in automotive LCD backlight systems.
For engineers reviewing the LM3492MH/NOPB datasheet, LM3492MH/NOPB pinout, LM3492MH/NOPB application, or LM3492MH/NOPB equivalent, key selection considerations include its integrated 3.9-A N-channel MOSFET, Dynamic Headroom Control for efficiency optimization, bidirectional COMM pin for MCU diagnostics, and thermally enhanced 20-pin HTSSOP package with exposed thermal pad.
Technical Context
The LM3492MH/NOPB employs Projected-On-Time (POT) control for its boost stage-eliminating loop compensation while maintaining near-constant switching frequency across input (4.5–65 V) and output (up to 65 V) ranges. Its fast-slew-rate current regulators support 300 ns minimum dimming pulse width and channel-specific enable/disable via DIM1/CLK and DIM2 pins.
Dynamic Headroom Control (DHC) actively adjusts the FB threshold (1.05–2.5 V) based on IOUT voltage to minimize current regulator power loss; DHC sensitivity and soft-start timing are set by an external capacitor on the CDHC pin. The COMM pin provides open-drain bidirectional communication for power-good, overtemperature, IOUT over/undervoltage flags, and commands including switching frequency tuning and Channel 1 disable.
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 bus inputs without pre-regulation. |
| Max Output Voltage | 65 V - drives up to 28-series white LEDs (typical VF ≈ 2.3 V) per string with headroom margin. |
| LED Current Accuracy | ±3% - ensures consistent brightness across channels and temperature (−40°C to +125°C). |
| Dimming Contrast Ratio | 1000:1 at >3 kHz - enables high-fidelity grayscale rendering in LCD backlights without visible flicker. |
| Switching Frequency | 200 kHz to 1 MHz (programmable via RT resistor) - balances EMI, efficiency, and inductor size; stable with ceramic capacitors, no audible noise. |
| Integrated MOSFET | 3.9-A peak, 190-mΩ RDS(on) - reduces external component count and PCB footprint; eliminates need for external high-side switch. |
| Thermal Protection | 165°C shutdown with 20°C hysteresis - prevents thermal runaway during overload or poor heatsinking conditions. |
Pinout & Package
LM3492MH/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (7.80 mm × 4.40 mm) with exposed PowerPAD™ for low thermal resistance (RθJC(bot) = 2°C/W). The exposed pad must be soldered to a PCB ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | Precision enable with 1.63 V threshold and 194 mV hysteresis; internally pulled up; supports UVLO implementation via resistor divider on VIN. |
| VIN | Main Input Supply | Accepts 4.5–65 V; powers internal LDO (VCC) and boost circuitry; requires local bulk capacitance. |
| SW | Switch Node | Drain of integrated N-MOSFET; connects to boost inductor; high dV/dt node requiring careful layout and snubber if needed. |
| VOUT | Output Voltage Sense | Sense point for switching frequency regulation; tied to feedback network and RT resistor for frequency programming. |
| RT | Frequency Control | Resistor-to-VOUT sets switching frequency; value directly determines fSW (e.g., 300 kΩ ≈ 500 kHz at VIN=12 V, VOUT=65 V). |
| FB | Feedback Input | Regulates output voltage; voltage range 1.05–2.5 V under DHC control; connected to resistive divider from VOUT. |
| GND | Analog Ground | Reference for analog circuits (FB, IREF, EN); must be star-connected to LGND and PGND at single point. |
| IOUT2 / IOUT1 | Current Regulator Inputs | High-side outputs for LED strings; each regulates current independently; VIOUT ≤ 65 V; leakage <5 µA at 65 V. |
| CDHC | DHC Timing & Soft-Start | Capacitor sets DHC response time and soft-start ramp rate; 120-µA internal current source charges CCDHC at startup. |
| IREF | Current Setting Reference | Resistor-to-GND programs LED current (50–200 mA); IREF voltage = 1.256 V (±2.5%); sets both channels identically. |
| COMM | Bidirectional I/O | Open-drain interface for MCU: reports faults (PG, OT, IOUT OV/UV), accepts commands (freq tune, CH1 disable); uses DIM1/CLK as data clock. |
| LGND | Current Regulator Ground | Separate ground return for current sense paths; must connect externally to GND; not internally tied. |
| DIM1/CLK | Channel 1 Dimming / Data Clock | Active-low PWM input for CH1; also serves as latching clock for COMM data transfer when CH1 is disabled. |
| DIM2 | Channel 2 Dimming | Active-low PWM input for CH2; 5-µA internal pull-down; supports independent dimming control. |
| PGND | Power Ground | Return path for MOSFET switch current; must connect externally to GND; low-inductance path critical for EMI and stability. |
| VCC | LDO Output | 5.5-V regulated supply (±10%); powers internal logic and gate drive; requires ≥0.47 µF ceramic capacitor to GND. |
| ILIM | Peak Current Limit Adjust | Resistor-to-VCC reduces MOSFET peak current limit (3.9 A max); grounding ILIM enables full 3.9-A capability. |
| DAP | Exposed Thermal Pad | Internally connected to die substrate; must be soldered to large copper area for thermal conduction and EMI reduction. |
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) | Automatically minimizes VOUT to just above LED string forward voltage, reducing current regulator power loss and improving system efficiency by up to 15%. |
| 1000:1 contrast ratio at >3 kHz | Fast current regulator slew rate enables narrow-pulse-width dimming (300 ns min), supporting high-resolution grayscale in automotive displays. |
| Bidirectional COMM pin | Enables real-time fault reporting (power-good, overtemperature, IOUT OV/UV) and command reception (frequency tuning, CH1 disable) using only one MCU GPIO. |
| Thermally enhanced HTSSOP-20 | Exposed PowerPAD™ delivers RθJC(bot) = 2°C/W, enabling 15 W operation at TA = 125°C with minimal heatsinking. |
Applications
| Automotive LCD Backlight | Marine GPS Display |
|---|---|
Use Scenario: Driving dual 14-LED strings (28 total) in a 10" automotive infotainment display with dynamic local dimming. IC Role / Device Role / Timing Role: Primary LED driver IC providing regulated current, boost conversion, and synchronized PWM dimming for two independent zones. Use Value: ±3% current matching ensures uniform luminance across zones; DHC maintains >88% efficiency across LED aging and temperature drift. | Use Scenario: Powering high-brightness backlight for marine-grade GPS units exposed to wide ambient temperature (−40°C to +85°C) and salt-humidity environments. IC Role / Device Role / Timing Role: Dual-channel constant-current source with robust thermal protection and wide-input operation for reliable outdoor visibility. Use Value: 65 V max output accommodates degraded battery conditions; thermal shutdown at 165°C prevents field failures in sealed enclosures. |
| Industrial HMI Panel | Avionics Display Backlight |
Use Scenario: Controlling LED backlight in factory-floor human-machine interface panels requiring EMC compliance and long service life. IC Role / Device Role / Timing Role: Integrated boost + current regulation IC eliminating discrete FET and op-amp stages, reducing BOM count and failure points. Use Value: Ceramic-capacitor stability and no-audible-noise operation meet industrial noise standards; AEC-Q100 Grade 1 qualification ensures reliability. | Use Scenario: Supporting DO-160-compliant cockpit displays where EMI, thermal margin, and diagnostic traceability are mandatory. IC Role / Device Role / Timing Role: Safety-aware LED driver with COMM-based fault reporting (power-good, overtemperature) for integration into aircraft health monitoring systems. Use Value: Bidirectional COMM enables real-time status polling without additional isolation components; 125°C operating junction temperature meets avionics derating requirements. |
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 |
|---|---|---|---|
| LM3492Q1MH/NOPB | AEC-Q100 Grade 1 qualified; identical electrical specs but with extended automotive qualification and tighter test limits on thermal shutdown (165°C vs 165°C typical), OT hysteresis (15°C vs 15°C), and ESD (HBM ±2000 V). | Required for production automotive systems; supports PPAP documentation and zero-defect manufacturing requirements. | Select LM3492Q1MH/NOPB for automotive OEM or Tier-1 designs; LM3492MH/NOPB is suitable for industrial or commercial applications where AEC-Q100 is not mandated. |
| TPS61165DRVR | Single-channel, 40-V max output, 1.2-MHz fixed-frequency; no DHC, no COMM pin, no dual-dimming; ±5% current accuracy; smaller 6-pin SOT-23 package. | Targeted at cost-sensitive, space-constrained single-string applications (e.g., portable device backlights), not multi-zone or diagnostic-enabled systems. | Use TPS61165DRVR only when dual-channel operation, >40 V output, or MCU diagnostics are unnecessary; it cannot replace LM3492MH/NOPB in existing dual-string designs. |
Compared with LM3492Q1MH/NOPB, the LM3492MH/NOPB offers identical functionality and performance but lacks formal automotive qualification-making it ideal for industrial or commercial backlighting where cost and qualification overhead matter. Versus TPS61165DRVR, LM3492MH/NOPB provides true dual-channel independent dimming, higher voltage capability, integrated diagnostics, and superior current accuracy-justifying its use in complex, safety-aware display systems.
Availability
LM3492MH/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 guaranteed traceable sourcing.
Supply support for LM3492MH/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 designing analog, embedded processing, and digital signal solutions for industrial, automotive, and consumer markets.
The LM3492MH/NOPB belongs to TI's high-reliability LED driver product line, engineered specifically for demanding backlight applications requiring precise current regulation, wide input range, and integrated diagnostics in compact automotive and industrial form factors.
FAQ
What is the maximum LED string voltage supported by the LM3492MH/NOPB?
The LM3492MH/NOPB supports a maximum output voltage of 65 V, enabling it to drive up to 28-series white LEDs (assuming ~2.3 V forward voltage per LED) in each of its two independent channels. This rating is confirmed in the Absolute Maximum Ratings table and Typical Application section of the SNVS656D datasheet, and applies under continuous operation with proper thermal management.
Does the LM3492MH/NOPB require external loop compensation components?
No, the LM3492MH/NOPB does not require external loop compensation components. Its boost converter uses Texas Instruments' proprietary Projected-On-Time (POT) control architecture, which inherently provides stability across input and output voltage variations. This is explicitly stated in the Features section and validated in the Typical Application circuit, where no compensation network appears between FB and GND.
How is LED current programmed on the LM3492MH/NOPB?
LED current on the LM3492MH/NOPB is programmed using a single external resistor connected from the IREF pin to GND. The IREF pin maintains a precise 1.256 V reference (±2.5%), so current is calculated as ILED = 1.256 V / RIREF. For example, a 12.5 kΩ resistor sets 100 mA per channel. This method is documented in Section 7.5 Electrical Characteristics and Figure 21 of the SNVS656D datasheet.
What functions does the COMM pin provide on the LM3492MH/NOPB?
The COMM pin on the LM3492MH/NOPB is a bidirectional open-drain I/O that supports power-good indication, overtemperature flagging, IOUT overvoltage/undervoltage detection, switching frequency tuning, and channel 1 disabling-all via a single MCU GPIO. Its operation is detailed in Pin Functions (Section 6) and Feature Description (Section 8.3.6), with timing governed by the DIM1/CLK pin as a data latch clock.
Is the LM3492MH/NOPB pin-compatible with the LM3492Q1MH/NOPB?
Yes, the LM3492MH/NOPB is pin-compatible and functionally identical to the LM3492Q1MH/NOPB in terms of pin assignment, electrical behavior, and package (20-pin HTSSOP). The sole difference is qualification: LM3492Q1MH/NOPB is AEC-Q100 Grade 1 certified for automotive use, while LM3492MH/NOPB is intended for industrial/commercial applications. Both share identical pinout, thermal pad layout, and PCB footprint.
LM3492MH/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
LM3492MH/NOPB FAQ
1.How can I place an order for LM3492MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492MH/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 LM3492MH/NOPB reliable?
The price and inventory of LM3492MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492MH/NOPB?
LM3492MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492MH/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 LM3492MH/NOPB?
For technical support, including LM3492MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492MH/NOPB requirements.
6.How does Aetrix verify that LM3492MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492MH/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 LM3492MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492MH/NOPB?
All LM3492MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492MH/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 LM3492MH/NOPB part is unused and in its original packaging.
Return procedure for LM3492MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3492MH/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
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