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Texas Instruments LM3406HVQMHQ1
- Part No.:
- LM3406HVQMHQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3406HVQMHQ1.pdf
- Description:
- IC LED DRVR RGLTR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,432
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Product details
Overview
LM3406HVQMHQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified, monolithic buck LED driver IC with integrated 2.0A N-channel MOSFET, designed for constant-current regulation of high-power LED arrays in automotive lighting systems. It operates from 6V to 75V input, delivers true average current control via external sense resistor, supports PWM dimming via dedicated DIM pin or VINS comparator, and features thermal shutdown at 165°C.
For engineers reviewing the LM3406HVQMHQ1 datasheet, LM3406HVQMHQ1 pinout, LM3406HVQMHQ1 application, or LM3406HVQMHQ1 equivalent, key selection considerations include its 75V max VIN rating, 1.7A minimum current limit over temperature, controlled-on-time (COT) architecture for stable switching frequency across wide VIN/VO ranges, TSSOP-14 exposed-pad package with 50°C/W θJA, and automotive-grade reliability for under-hood and headlamp applications.
Technical Context
The LM3406HVQMHQ1 implements a controlled-on-time (COT) buck regulator architecture with true average current sensing, where the on-time tON is programmable via RON and scales inversely with both VIN and VO to maintain near-constant switching frequency in continuous conduction mode. Its error amplifier uses transconductance (Gm = 145 µS) feedback to regulate CS pin voltage to 200 mV (typ), enabling precise LED current setting independent of LED VF drift.
Internal protection includes cycle-by-cycle current limiting at 2.1A (typ), overvoltage/overcurrent shutdown at 300 mV on CS, BOOT UVLO (1.7–4.3V), VCC UVLO (5.3V), and thermal shutdown with 25°C hysteresis. The device integrates a 7V linear regulator (VCC) with 6.4–7.5V output, supports all-ceramic or capacitor-less outputs, and provides fast logic-level PWM dimming with 75 µA internal pull-up on DIM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 75V - Enables direct connection to 24V/48V industrial and 12V/24V automotive battery rails with cold-crank margin. |
| Output Current Limit | 1.65A to 2.60A - Minimum guaranteed current limit over full −40°C to +125°C ambient ensures robust LED drive under thermal stress. |
| CS Regulation Threshold | 191.0–210.0 mV - Sets nominal LED current via RSNS = 0.2V / IF; tight tolerance enables ±5% current accuracy without calibration. |
| Switch RDS(on) | 0.37–0.75 Ω - Low conduction loss supports >90% efficiency at 1.5A with minimal thermal rise in TSSOP-14 package. |
| Thermal Shutdown | 165°C junction - Triggers automatic shutdown with 25°C hysteresis to prevent permanent damage during sustained overload or poor heatsinking. |
| θJA | 50°C/W - Achievable with DAP soldered to ≥2 in² of 1-oz copper; defines maximum power dissipation before thermal throttling. |
| Dimming Interface | Dedicated DIM pin (TTL-compatible, 2.2V VIH) - Enables <1 µs turn-off delay and eliminates need for external pull-up resistor. |
Pinout & Package
TSSOP-14 exposed-pad package (Package Number PWP0014A) with thermal pad (DAP) requiring 4–6 vias to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Power switch node | Connects to inductor and Schottky diode; carries full switching current and must be routed with low-inductance layout. |
| 3 BOOT | Bootstrap supply for high-side gate driver | Requires 22 nF ceramic capacitor to SW; enables floating gate drive for integrated N-MOSFET when source rises to VIN. |
| 4 NC | No connect | Internally unconnected; must remain unpopulated and unconnected on PCB. |
| 5 VOUT | Output voltage sense | Monitors LED string cathode node; used for open-circuit protection and output voltage clamping coordination. |
| 6 CS | Current sense feedback | Accepts voltage drop across external RSNS; regulates average LED current to 200 mV reference. |
| 7 GND | Analog and power ground | Primary return path for CS, COMP, DIM, RON; must be tied to low-impedance system ground plane. |
| 8 DIM | PWM dimming enable/disable | Logic-level input: high = LED on, low = current disabled; 75 µA internal pull-up ensures default-on operation. |
| 9 COMP | Error amplifier output | Drives external compensation network (e.g., 0.1 µF X5R/X7R to GND); sets loop stability and transient response. |
| 10 RON | On-time programming | Resistor to VIN sets tON; determines base switching frequency and influences CCM boundary and ripple. |
| 11 VCC | Internal 7V bias supply | Bypass with 0.1 µF ceramic capacitor; powers gate driver and analog circuitry; regulated from VIN above 8.8V. |
| 12 VINS | Input-voltage PWM dimming comparator | Enables two-wire dimming: triggers shutdown when VIN drops below 70% of nominal input voltage. |
| 13,14 VIN | Main input voltage supply | Accepts 6–75V DC; powers internal regulator and switch; requires local ceramic bypass capacitor. |
| DAP | Thermal pad | Must be soldered to PCB ground plane with ≥4 thermal vias; primary heat dissipation path for 1.5A operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation with full electrical testing per automotive reliability standards. |
| True average current control | Integrates CS signal to maintain 200 mV average at CS pin, rejecting ripple and ensuring stable LED brightness across VF variation. |
| Controlled-on-time (COT) architecture | Delivers stable switching frequency over wide VIN/VO range without external clock; simplifies EMI filtering design. |
| Integrated 2.0A N-MOSFET | Eliminates external high-side switch; reduces BOM count and layout area while maintaining 0.37Ω RDS(on) at TJ = 25°C. |
| Capacitor-less output support | Stable operation without output capacitor enabled by COT control and current-mode stability; reduces cost and size. |
| Two-dimming methods | Hardware PWM via DIM pin (fastest response) and input-voltage PWM via VINS pin (two-wire wiring simplicity). |
Applications
| Automotive Headlamps | Truck & Bus Exterior Lighting |
|---|---|
|
Use Scenario: High-brightness LED headlamp modules requiring precise current regulation, thermal resilience, and EMI-compliant switching in engine compartment environments. IC Role / Device Role / Timing Role: Constant-current buck controller managing up to 1.5A through series-connected white LEDs; handles cold-crank (6V) and load-dump (75V) transients. Use Value: AEC-Q100 Grade 1 qualification ensures operation at 125°C ambient; 75V VIN rating withstands ISO 7637-2 pulse 5a; TSSOP-14 DAP enables compact thermal design. |
Use Scenario: Rear combination lamps (brake/tail/turn) using multi-string LED arrays with varying VF and thermal profiles across large PCB areas. IC Role / Device Role / Timing Role: Single-chip LED driver providing true average current control per string, immune to VF mismatch and temperature-induced drift. Use Value: 200 mV CS reference tolerance enables ±5% current matching across strings; RON-programmable tON allows optimization for 250–500 kHz EMI bands. |
| Industrial Machine Vision Lighting | Off-Highway Vehicle Work Lights |
|
Use Scenario: Strobe-capable LED illuminators for high-speed inspection systems requiring microsecond-level dimming precision and zero-output ripple during exposure windows. IC Role / Device Role / Timing Role: Fast-response current source with <1 µs DIM pin turn-off delay and cycle-by-cycle current limiting for fault containment. Use Value: Dedicated DIM interface enables clean on/off transitions without output capacitor discharge artifacts; 2.1A current limit protects against shorted LED strings. |
Use Scenario: Heavy-duty work lights on construction/mining equipment exposed to vibration, wide temperature swings, and 24V/48V battery systems with high ESD risk. IC Role / Device Role / Timing Role: Robust LED driver with integrated thermal shutdown (165°C), 2kV HBM ESD rating, and 50°C/W θJA for passive heatsink compatibility. Use Value: Exposed thermal pad (DAP) and TSSOP-14 footprint simplify mechanical integration into ruggedized enclosures; VINS dimming supports simple two-wire harness routing. |
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 |
|---|---|---|---|
| LM3406HVQ1 | Same silicon, identical electrical specs, but packaged in HTSSOP-14 (PWP0014A) without automotive qualification documentation traceability. | Lacks AEC-Q100 Grade 1 test reports and PPAP support; not approved for safety-critical automotive production. | Select LM3406HVQMHQ1 when full automotive qualification, lot traceability, and extended temperature validation are required. |
| TPS92630QPWPRQ1 | Three-channel, 150mA/channel automotive LED driver with I²C interface; no integrated MOSFET; requires external FETs and sense resistors. | Designed for multi-zone adaptive lighting with digital control; lacks single-channel 1.5A capability and analog dimming simplicity. | Choose LM3406HVQMHQ1 for high-current single-string applications where analog PWM dimming, integrated switch, and cost-sensitive BOM are priorities. |
Compared with LM3406HVQ1, the LM3406HVQMHQ1 adds formal AEC-Q100 Grade 1 compliance documentation and production traceability, while versus TPS92630QPWPRQ1 it offers higher single-channel current, integrated power stage, and simpler analog control-making it optimal for cost-constrained, thermally demanding, single-string automotive LED systems.
Availability
LM3406HVQMHQ1 is available at Aetrix Electronics and suitable for automotive headlamps, off-highway work lights, industrial machine vision illuminators, and truck exterior lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM3406HVQMHQ1 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 automotive-grade power management solutions with over 50 years of innovation in high-reliability IC design.
The LM3406HVQMHQ1 belongs to TI's automotive LED driver product line, engineered specifically for AEC-Q100-compliant constant-current regulation in harsh-environment lighting systems where input voltage resilience, thermal robustness, and functional safety readiness are critical.
FAQ
What is the maximum input voltage rating for the LM3406HVQMHQ1?
The LM3406HVQMHQ1 supports a maximum input voltage of 75V, verified across the full operating temperature range. This rating is specified in the Absolute Maximum Ratings table and confirmed in the Recommended Operating Conditions section of the official SNVS512E datasheet. The 75V capability enables direct use in 48V industrial systems and 24V automotive platforms with load-dump immunity, distinguishing it from the standard LM3406 (42V max). Operation beyond 75V risks permanent damage to the VIN, VINS, and VOUT pins.
How does the LM3406HVQMHQ1 achieve true average current control?
The LM3406HVQMHQ1 achieves true average current control through an integrated transconductance (Gm) error amplifier that continuously integrates the voltage at the CS pin and regulates it to a 200 mV (typ) average reference. Unlike peak-current-mode controllers, this architecture rejects high-frequency ripple and maintains stable LED current despite variations in LED forward voltage or input/output voltage. The LM3406HVQMHQ1's CS pin bias current is only 0.9 µA, minimizing RSNS error, and its Gm of 145 µS ensures fast correction of current deviations-critical for consistent luminance in automotive lighting.
Can the LM3406HVQMHQ1 operate without an output capacitor?
Yes, the LM3406HVQMHQ1 supports capacitor-less output configurations due to its controlled-on-time (COT) architecture and current-mode stability. The device maintains regulation by directly controlling inductor current rather than output voltage, eliminating the need for output capacitance to stabilize voltage ripple. However, an output capacitor may still be added for EMI suppression or to reduce LED current ripple below ±5% in sensitive applications like machine vision. When omitted, layout must minimize parasitic inductance at the SW and VOUT nodes to prevent voltage overshoot during LED open-circuit events.
What is the purpose of the VINS pin on the LM3406HVQMHQ1?
The VINS pin on the LM3406HVQMHQ1 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 without requiring a separate control wire. This feature simplifies wiring in space-constrained automotive lamp assemblies and supports legacy dimming interfaces. The VINS pin draws only 25 µA at 24V, minimizing impact on upstream power supplies, and its threshold is internally trimmed for consistent behavior across temperature and process variation-ensuring reliable dimming across the −40°C to +125°C operating range of the LM3406HVQMHQ1.
Does the LM3406HVQMHQ1 include thermal protection?
Yes, the LM3406HVQMHQ1 incorporates fully integrated thermal shutdown protection with a trip threshold of 165°C (typical) and 25°C hysteresis. When junction temperature exceeds 165°C, the device disables the internal MOSFET and gate driver while keeping bias circuitry active, allowing safe cooldown before automatic recovery. This protection is validated per AEC-Q100 requirements and functions independently of external components. The thermal pad (DAP) must be soldered to a minimum 2 in² copper area with 4–6 vias to achieve the rated 50°C/W θJA-ensuring the LM3406HVQMHQ1 sustains 1.5A output current without exceeding safe thermal limits in automotive under-hood environments.
LM3406HVQMHQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM3406HVQMHQ1 FAQ
1.How can I place an order for LM3406HVQMHQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3406HVQMHQ1 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 LM3406HVQMHQ1 reliable?
The price and inventory of LM3406HVQMHQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3406HVQMHQ1 is usually 5 days.
3.What payment methods are accepted for LM3406HVQMHQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3406HVQMHQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3406HVQMHQ1?
LM3406HVQMHQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3406HVQMHQ1 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 LM3406HVQMHQ1?
For technical support, including LM3406HVQMHQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3406HVQMHQ1 requirements.
6.How does Aetrix verify that LM3406HVQMHQ1 is sourced from the original manufacturer or authorized distributors?
All LM3406HVQMHQ1 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 LM3406HVQMHQ1 meets industry standards.
7.What is the process for return or replacement of LM3406HVQMHQ1?
All LM3406HVQMHQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM3406HVQMHQ1, 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 LM3406HVQMHQ1 part is unused and in its original packaging.
Return procedure for LM3406HVQMHQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3406HVQMHQ1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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