My Inquiry
My Account
Texas Instruments LM3492HCQMHX/NOPB
- Part No.:
- LM3492HCQMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3492HCQMHX/NOPB.pdf
- Description:
- IC LED DRV RGLTR 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,660
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3492HCQMHX/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 delivers up to 15 W total output power, supports 4.5 V–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 LM3492HCQMHX/NOPB datasheet, LM3492HCQMHX/NOPB pinout, LM3492HCQMHX/NOPB application, or LM3492HCQMHX/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, and thermally enhanced 20-pin HTSSOP (PWP) package rated for −40°C to +125°C junction temperature.
Technical Context
The LM3492HCQMHX/NOPB uses projected-on-time (POT) control for its boost stage-eliminating loop compensation while delivering fast transient response and nearly constant switching frequency. Its integrated 3.9-A/190-mΩ N-channel MOSFET and dual-channel current regulators operate independently, enabling per-string dimming and over-power protection.
DHC dynamically adjusts the boost output voltage to match the minimum required headroom across each LED string, reducing regulator power loss. The COMM pin provides bidirectional open-drain communication for real-time status reporting (power-good, overtemperature, IOUT over/undervoltage) and command execution (channel disable, frequency tuning), all without latching shutdown.
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. |
| LED Current Accuracy | ±3% - ensures consistent brightness across strings and temperature (−40°C to +125°C). |
| Dimming Contrast Ratio | 10000:1 - enabled by 300-ns minimum PWM pulse width and fast slew-rate current regulation. |
| Switching Frequency | 200 kHz to 1 MHz - set by external RT resistor; stable with ceramic output capacitors, no audible noise. |
| Integrated MOSFET RDS(on) | 0.19 Ω (typ) - reduces conduction loss and enables compact 15-W solution size. |
| Dynamic Headroom Control | Automatically minimizes VOUT - lowers current regulator dissipation and improves system efficiency by up to 15% vs fixed-output designs. |
| Thermal Shutdown | 165°C (typ), 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM3492HCQMHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (6.50 mm × 4.40 mm) with exposed thermal pad for direct PCB ground connection. Pin functions are validated per TI SNVS797B Rev B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Precision threshold (1.63 V typ); internal pullup enables UVLO-based input monitoring. |
| VIN | Main power input | Accepts 4.5–65 V; powers boost stage and internal LDO (VCC). |
| SW | Switch node | Drain of integrated 3.9-A N-MOSFET; connects to boost inductor. |
| RT | Frequency programming | Resistor-to-VOUT sets switching frequency from 200 kHz to 1 MHz. |
| FB | Output voltage feedback | Senses VOUT via resistor divider; reference range 1.05–2.5 V. |
| GND / PGND / LGND | Ground terminals | Separate analog (GND), power-switch (PGND), and current-regulator (LGND) grounds minimize noise coupling. |
| IOUT1 / IOUT2 | LED string outputs | High-side current sinks; each regulates 50–250 mA with independent DIM control. |
| DIM1/CLK / DIM2 | PWM dimming inputs | 5-µA internal pull-down; DIM1 also serves as COMM data clock. |
| COMM | Bidirectional diagnostic interface | Open-drain I/O for MCU communication: power-good, overtemp, fault reporting, and command receipt. |
| CDHC | DHC sensitivity & soft-start | 12-µA current source charges external capacitor; sets DHC response time and startup ramp rate. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Projected-on-time (POT) control eliminates external compensation components and simplifies layout. |
| Stable with ceramic capacitors | Enables low-ESR, high-reliability output filtering without audible noise or ringing. |
| Programmable soft-start | CDHC capacitor value controls startup dV/dt, limiting inrush current into LED strings and output caps. |
| Over-power protection | Monitors IOUT × VHEADROOM; disables current regulator before thermal limit is exceeded. |
| ±3% LED current accuracy | Maintains consistent luminance across channels and temperature without calibration. |
Applications
| Automotive LCD Backlight | Marine GPS Display |
|---|---|
Use Scenario: Driving dual 6.5"–10" TFT-LCD panels in vehicles with variable battery voltage (6 V–16 V nominal, up to 65 V during load dump). IC Role / Device Role / Timing Role: Dual-channel LED driver with DHC, enabling adaptive output voltage and individual PWM dimming per string. Use Value: Maintains >90% efficiency across full input range and LED aging; eliminates need for multiple BOMs when scaling panel size. | Use Scenario: High-brightness outdoor display in marine environments requiring extended temperature operation and ESD robustness. IC Role / Device Role / Timing Role: Automotive-grade LED controller (AEC-Q100 Grade-1) with COMM-based diagnostics for remote fault logging. Use Value: Enables real-time overtemperature and IOUT undervoltage alerts via MCU interface, improving field reliability and serviceability. |
| Industrial HMI Panel | Avionics Cockpit Display |
Use Scenario: Compact 7" industrial human-machine interface with high-contrast UI and ambient light adaptive dimming. IC Role / Device Role / Timing Role: Fast-current-regulator LED driver supporting 10000:1 contrast via sub-microsecond PWM pulses on DIM1/DIM2. Use Value: Delivers crisp text and graphics under varying lighting; eliminates visible PWM flicker due to ceramic-capacitor stability. | Use Scenario: Safety-critical cockpit display requiring fail-safe supervision and deterministic enable/disable timing. IC Role / Device Role / Timing Role: Precision-enable LED driver with 194-mV EN hysteresis and thermal shutdown at 165°C. Use Value: Prevents false turn-off from supply noise; guarantees graceful shutdown before silicon damage occurs. |
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 |
|---|---|---|---|
| LM3492QMHX/NOPB | Non-automotive grade; lacks AEC-Q100 qualification and reduced thermal spec (TJ = 125°C max vs 125°C for LM3492HCQMHX/NOPB). | Intended for commercial/industrial displays only; not suitable for automotive safety-critical systems. | Select only if AEC-Q100 compliance and extended temperature margin are unnecessary. |
| TPS61165DRVR | Single-channel, 40-V max output; no DHC, COMM interface, or dual independent dimming; requires external MOSFET. | Targeted at smaller displays (<5") with simpler control requirements and lower power (<5 W). | Choose when cost and board space outweigh need for diagnostics, efficiency optimization, or dual-string flexibility. |
Compared with LM3492QMHX/NOPB, the LM3492HCQMHX/NOPB adds AEC-Q100 Grade-1 qualification, tighter EN hysteresis, and enhanced thermal protection-critical for automotive deployment. Versus TPS61165DRVR, it delivers dual-channel control, integrated power switch, and DHC-reducing component count and improving system-level efficiency in multi-string backlight designs.
Availability
LM3492HCQMHX/NOPB is available at Aetrix Electronics and suitable for automotive LCD backlighting, marine GPS displays, industrial HMI panels, and avionics cockpit displays requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM3492HCQMHX/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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and automotive ICs.
The LM3492HC product line delivers highly integrated, AEC-Q100-qualified LED drivers for automotive and harsh-environment displays-designed to replace discrete boost + linear regulator solutions with single-chip efficiency, diagnostics, and thermal resilience.
FAQ
What is the maximum LED string voltage supported by the LM3492HCQMHX/NOPB?
The LM3492HCQMHX/NOPB supports up to 65 V output voltage, enabling driving of longer LED strings-typically up to 28 LEDs at 150 mA per string. This rating is validated across the full operating temperature range (−40°C to +125°C) and accounts for worst-case forward voltage drift and ripple margin. The device's dynamic headroom control actively minimizes VOUT to reduce regulator losses while maintaining safe headroom.
How does the COMM pin function in the LM3492HCQMHX/NOPB?
The COMM pin in the LM3492HCQMHX/NOPB is a bidirectional open-drain interface used for MCU communication. It reports status flags-including power-good, overtemperature, and IOUT over/undervoltage-and accepts commands such as switching frequency tuning and Channel 1 disable. DIM1/CLK serves as the synchronous clock for COMM data transfer. No external pull-up is required for basic status reporting, but one is needed for command reception.
Can the LM3492HCQMHX/NOPB operate without an external RT resistor?
No-the LM3492HCQMHX/NOPB requires an external resistor between the RT pin and VOUT to set the switching frequency. The frequency scales inversely with RRT, ranging from ~200 kHz (RRT = 800 kΩ) to ~1 MHz (RRT = 100 kΩ). Omitting RRT leaves the RT pin floating, causing undefined frequency behavior and potential instability. TI recommends using 1% tolerance metal-film resistors for precise frequency control.
What is the purpose of the CDHC pin on the LM3492HCQMHX/NOPB?
The CDHC pin on the LM3492HCQMHX/NOPB serves two critical functions: it sets dynamic headroom control (DHC) sensitivity via an external capacitor, and provides soft-start timing during power-up. A 12-µA internal current source charges the CDHC capacitor, generating a controlled ramp on the FB threshold. Smaller CDHC values yield faster DHC response to LED VF drift but increase output voltage ripple; typical values range from 1 nF to 10 nF.
Does the LM3492HCQMHX/NOPB support independent current programming for each channel?
No-the LM3492HCQMHX/NOPB uses a single IREF pin to set the regulated current for both channels identically. An external resistor from IREF to GND programs the same current (50–250 mA) on IOUT1 and IOUT2. Independent dimming is achieved via separate DIM1/CLK and DIM2 PWM inputs, but current magnitude cannot be varied per channel. For true independent current setting, consider TI's TLC5947 or similar multi-channel LED drivers.
LM3492HCQMHX/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3492HCQMHX/NOPB FAQ
1.How can I place an order for LM3492HCQMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3492HCQMHX/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 LM3492HCQMHX/NOPB reliable?
The price and inventory of LM3492HCQMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3492HCQMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3492HCQMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3492HCQMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3492HCQMHX/NOPB?
LM3492HCQMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3492HCQMHX/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 LM3492HCQMHX/NOPB?
For technical support, including LM3492HCQMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3492HCQMHX/NOPB requirements.
6.How does Aetrix verify that LM3492HCQMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3492HCQMHX/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 LM3492HCQMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3492HCQMHX/NOPB?
All LM3492HCQMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3492HCQMHX/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 LM3492HCQMHX/NOPB part is unused and in its original packaging.
Return procedure for LM3492HCQMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3492HCQMHX/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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
