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Texas Instruments LM3406HVQMHXQ1
- Part No.:
- LM3406HVQMHXQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3406HVQMHXQ1.pdf
- Description:
- IC LED DRVR RGLTR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,683
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Product details
Overview
LM3406HVQMHXQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified automotive buck LED driver IC with integrated 2.0A N-channel MOSFET, true average current control, 6V–75V input range, and dedicated PWM dimming logic pin - designed for constant-current driving of high-power LED arrays in headlamps, DRLs, and interior lighting.
For engineers reviewing the LM3406HVQMHXQ1 datasheet, LM3406HVQMHXQ1 pinout, LM3406HVQMHXQ1 application, or LM3406HVQMHXQ1 equivalent, key selection criteria include its 1.7A minimum output current limit over temperature, 280 ns minimum on-time, TSSOP-14 exposed-pad package with 50°C/W θJA, thermal shutdown at 165°C, and dual-dimming support (DIM pin + VINS comparator).
Technical Context
The LM3406HVQMHXQ1 implements a controlled-on-time (COT) architecture with inverse VIN/VO modulation to maintain stable switching frequency in continuous conduction mode. Its transconductance error amplifier regulates CS pin voltage to 200 mV (±12.5 mV), enabling precise average LED current control independent of LED VF drift.
It integrates a 7V internal linear regulator (VCC), bootstrap gate driver (BOOT–SW), cycle-by-cycle current limiting at 2.1A typical, and dual-dimming paths: TTL-compatible DIM pin (VIH = 2.2V, VIL = 0.8V) and VINS comparator (70% VIN threshold) for two-wire dimming - all operating across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 75V - supports wide automotive battery transients including cold-crank (6.5V) and load-dump (75V). |
| Output Current Limit | 1.7A min over temperature - ensures ≥1.5A LED drive capability across full –40°C to +125°C ambient. |
| CS Regulation Threshold | 200 mV ±12.5 mV - sets LED current via RSNS = 0.2V / IF; enables <±5% current accuracy with precision resistor. |
| Min On-time | 280 ns typical - limits minimum duty cycle; critical for high-VIN/low-VO operation and fast PWM dimming response. |
| Thermal Shutdown | 165°C junction with 25°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| θJA | 50°C/W - achievable with DAP soldered to ≥2 in² 1-oz copper; defines max power dissipation before thermal shutdown. |
| Shutdown Current | 240–350 µA - ultra-low quiescent draw in RON-grounded shutdown state for always-on automotive systems. |
Pinout & Package
TSSOP-14 with exposed thermal pad (Package Number PWP0014A); DAP must be soldered to ground plane using 4–6 vias for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to inductor and Schottky diode cathode; carries high di/dt pulsed current; requires tight layout. |
| 3 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 22 nF ceramic capacitor to SW for floating bias generation. |
| 4 NC | No connect | No internal connection; must remain unconnected per datasheet. |
| 5 VOUT | Output voltage sense | Monitors LED string anode node; used for open-circuit protection and feedback path integrity. |
| 6 CS | Current sense input | Measures voltage across external RSNS; sets average LED current; 200 mV target enables 1.5A with 0.133Ω. |
| 7 GND | Power and signal ground | Common return for all analog and power circuits; must tie to DAP and system ground plane. |
| 8 DIM | PWM dimming enable | TTL-level logic input: high = LED on, low = MOSFET off; 75 µA internal pull-up eliminates external resistor. |
| 9 COMP | Error amplifier output | Compensates control loop; requires 0.1 µF X5R/X7R ceramic to GND for stability. |
| 10 RON | On-time programming | Resistor to VIN sets tON ≈ 1×10⁻¹¹ × RON × VO; determines switching frequency and light-load behavior. |
| 11 VCC | Internal 7V bias rail | Bypass with 0.1 µF ceramic; regulated from VIN; powers gate driver and analog circuitry. |
| 12 VINS | Input voltage dimming sense | Enables two-wire PWM dimming when VIN drops below 70% of nominal; supports dimming without extra control wire. |
| 13,14 VIN | Main power input | Accepts 6V–75V; supplies internal regulator and high-side switch; requires local CIN decoupling. |
| DAP | Thermal pad | Internally connected to GND; mandatory for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C ambient, meeting stringent reliability and test requirements. |
| True average current regulation | Maintains stable LED brightness despite VF variation across temperature, aging, and binning - no external averaging circuit needed. |
| Dual PWM dimming interface | Supports both logic-level DIM pin (fast response) and VINS comparator (two-wire wiring), enabling flexible system architecture. |
| Integrated 2.0A MOSFET with 0.75Ω RDS(on) | Eliminates external switch; reduces BOM count and layout complexity while delivering >90% efficiency at 1A/24V input. |
| Support for capacitor-less outputs | Stable operation without output capacitor due to inherent current-mode control and inductor-based filtering - lowers cost and size. |
| Programmable on-time architecture | Enables predictable frequency scaling with RON; avoids subharmonic oscillation and simplifies EMI filtering design. |
Applications
| Automotive Headlamps | Commercial Vehicle DRLs |
|---|---|
Use Scenario: High-brightness LED arrays in adaptive front-lighting systems (AFS) requiring robust thermal management and transient immunity. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1.5A through 6–10 series InGaN LEDs; handles 6V–75V input during cold-crank and load-dump events. Use Value: Delivers stable optical output under harsh automotive conditions; integrated thermal shutdown prevents LED damage during prolonged high-temp operation. | Use Scenario: Daytime running lights in trucks and buses where space, reliability, and EMI compliance are critical. IC Role / Device Role / Timing Role: Primary LED driver IC with dual-dimming support - DIM pin for CAN-controlled brightness, VINS for simple PWM input from vehicle body controller. Use Value: Reduces wiring harness complexity with two-wire dimming; 50°C/W θJA enables compact heatsink-free designs on metal-core PCBs. |
| Industrial Machine Vision Lighting | Off-Road Equipment Lighting |
Use Scenario: Stroboscopic LED illumination synchronized to camera exposure in automated inspection systems. IC Role / Device Role / Timing Role: Fast-response current source with 280 ns min on-time and <1 µs DIM pin propagation delay - enables precise microsecond-level LED pulsing. Use Value: Eliminates motion blur by matching LED pulse width to camera shutter; true average current ensures consistent intensity across frame rates. | Use Scenario: Harsh-environment lighting for construction, mining, and agricultural machinery subject to vibration, dust, and wide temperature swings. IC Role / Device Role / Timing Role: AEC-Q100 qualified LED driver operating continuously at –40°C to +125°C ambient; uses all-ceramic external components for long-term reliability. Use Value: Guarantees startup and operation in extreme cold without preheating; thermal hysteresis prevents cycling near shutdown threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3406HVQ1PWPRQ1 | TSSOP-14 package with same pinout and specs; differs only in tape-and-reel packaging (Q1 suffix denotes automotive grade in both). | Identical electrical and thermal performance; selected when reel-based SMT assembly is required. | Drop-in replacement for LM3406HVQMHXQ1 in automated production; identical footprint and thermal pad layout. |
| TPS92630QPWPRQ1 | Higher integration: includes 3-channel current sinks, I²C interface, and fault reporting; 60V max VIN; no integrated MOSFET. | Targeted at multi-zone adaptive lighting with digital control; requires external FETs and more complex firmware. | Choose when system needs programmable per-channel dimming, diagnostics, or multi-string independent control - not for single-string simplicity. |
Compared with LM3406HVQMHXQ1, LM3406HVQ1PWPRQ1 offers identical functionality in reel format for high-volume SMT, while TPS92630QPWPRQ1 trades integrated power stage for digital configurability and multi-channel capability - making it suitable for advanced lighting systems but over-specified for basic constant-current drive.
Availability
LM3406HVQMHXQ1 is available at Aetrix Electronics and suitable for automotive headlamps, commercial vehicle DRLs, and industrial machine vision lighting requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for LM3406HVQMHXQ1 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, embedded processing, and power management technologies, with leadership in automotive-grade ICs and high-reliability power solutions.
The LM3406HV-Q1 product line delivers AEC-Q100 qualified constant-current buck regulators for high-power LED lighting in safety-critical automotive applications - emphasizing thermal robustness, input transient tolerance, and dimming flexibility.
FAQ
What is the maximum input voltage rating for the LM3406HVQMHXQ1?
The LM3406HVQMHXQ1 has an absolute maximum VIN rating of 76V and a recommended operating range of 6V to 75V. This allows reliable operation during automotive load-dump events up to 75V while maintaining regulation down to 6V during cold-crank conditions - a key requirement for under-hood LED drivers. The device's internal protection circuits prevent damage even if transient spikes briefly exceed 75V.
How does the LM3406HVQMHXQ1 achieve true average current control?
The LM3406HVQMHXQ1 achieves true average current control using a transconductance error amplifier that regulates the CS pin voltage to a precise 200 mV reference. This forces the average voltage across the external sense resistor RSNS to remain at 200 mV, resulting in an average LED current of IF = 0.2 V / RSNS - independent of LED forward voltage variation, input voltage changes, or temperature drift. The integrated current-sense amplifier and compensation network eliminate need for external averaging components.
Can the LM3406HVQMHXQ1 operate without an output capacitor?
Yes, the LM3406HVQMHXQ1 supports capacitor-less output configurations due to its current-mode control architecture and direct inductor-to-LED connection. The inductor inherently filters ripple current, and the controlled-on-time regulation maintains stability without output capacitance - reducing BOM cost and board space. However, an output capacitor may still be added for enhanced EMI suppression or to mitigate voltage overshoot during open-circuit faults.
What is the purpose of the VINS pin on the LM3406HVQMHXQ1?
The VINS pin on the LM3406HVQMHXQ1 enables two-wire PWM dimming by monitoring input voltage level. When VINS falls below 70% of VIN, the internal comparator disables the power MOSFET, turning off LED current - allowing brightness control using only the main power supply line without a separate dimming signal wire. This simplifies wiring in space-constrained automotive modules and supports legacy dimming interfaces.
Does the LM3406HVQMHXQ1 require external compensation components?
Yes, the LM3406HVQMHXQ1 requires a 0.1 µF ceramic capacitor (X5R or X7R dielectric) connected between the COMP pin and GND to stabilize the error amplifier loop. No additional RC network is needed - the internal transconductance amplifier and fixed gain structure allow single-capacitor compensation. This simplifies design while ensuring phase margin >45° across operating conditions, as verified in TI's reference designs for 1.5A LED loads.
LM3406HVQMHXQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 75V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A
- Frequency:
- 10kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM3406HVQMHXQ1 FAQ
1.How can I place an order for LM3406HVQMHXQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3406HVQMHXQ1 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 LM3406HVQMHXQ1 reliable?
The price and inventory of LM3406HVQMHXQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3406HVQMHXQ1 is usually 5 days.
3.What payment methods are accepted for LM3406HVQMHXQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3406HVQMHXQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3406HVQMHXQ1?
LM3406HVQMHXQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3406HVQMHXQ1 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 LM3406HVQMHXQ1?
For technical support, including LM3406HVQMHXQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3406HVQMHXQ1 requirements.
6.How does Aetrix verify that LM3406HVQMHXQ1 is sourced from the original manufacturer or authorized distributors?
All LM3406HVQMHXQ1 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 LM3406HVQMHXQ1 meets industry standards.
7.What is the process for return or replacement of LM3406HVQMHXQ1?
All LM3406HVQMHXQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM3406HVQMHXQ1, 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 LM3406HVQMHXQ1 part is unused and in its original packaging.
Return procedure for LM3406HVQMHXQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3406HVQMHXQ1 Tags
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LYT1604D-TL
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