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Texas Instruments LM3406HVMHX/NOPB
- Part No.:
- LM3406HVMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3406HVMHX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
LM3406HVMHX/NOPB from Texas Instruments is a 1.5-A constant-current buck LED driver IC with integrated 2.0-A N-channel MOSFET, 6–75 V input range, true average current control via external sense resistor, and dedicated PWM dimming logic input. It delivers stable current to high-power LED arrays in automotive headlamps and industrial lighting systems.
For engineers reviewing the LM3406HVMHX/NOPB datasheet, LM3406HVMHX/NOPB pinout, LM3406HVMHX/NOPB application, or LM3406HVMHX/NOPB equivalent, key selection criteria include VIN range (6–75 V), minimum on-time (280 ns), thermal shutdown threshold (165°C), RDS-ON (0.37 Ω typ), and TSSOP-14 exposed-pad package compatibility with all-ceramic output capacitors.
Technical Context
The LM3406HVMHX/NOPB implements controlled-on-time (COT) architecture with inverse VIN/VO modulation to maintain relatively constant switching frequency in continuous conduction mode. Its transconductance error amplifier regulates CS pin voltage to 200 mV (typ), enabling precise average LED current control independent of LED VF variation.
It integrates a bootstrap-driven high-side MOSFET gate driver, internal 7-V linear regulator (VCC), cycle-by-cycle current limiting at 2.1 A (typ), and dual-dimming support-logic-level DIM pin (2.2 V VIH, 0.8 V VIL) and VINS comparator for two-wire PWM dimming. Thermal shutdown (165°C) and overvoltage protection (300 mV CS threshold) are built-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports 12 V, 24 V, and 48 V automotive and industrial bus rails without pre-regulation. |
| Output Current | Up to 1.5 A - set by external RSNS (RSNS = 0.2 V / IF); minimum 1.7 A current limit ensures headroom for transient surges. |
| Current Sense Threshold | 200 mV (typ) - enables accurate average current regulation with low power loss in RSNS. |
| Switch RDS-ON | 0.37 Ω (typ) - reduces conduction loss and thermal stress at full load; supports >90% efficiency with proper layout. |
| Min On-Time | 280 ns (typ) - enables high-frequency operation (>1 MHz) and tight dimming control at low duty cycles. |
| Thermal Shutdown | 165°C (typ) - protects die during overload or poor heatsinking; 25°C hysteresis prevents oscillation near trip point. |
| Package | TSSOP-14 with exposed thermal pad - requires ≥4 vias to ground plane for θJA = 50°C/W performance. |
Pinout & Package
TSSOP-14 package with exposed thermal pad (DAP), rated for 50°C/W junction-to-ambient thermal resistance when DAP is soldered to ≥2 in² of 1-oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to inductor and Schottky diode anode; carries high di/dt pulsed current; must be short and low-inductance. |
| 3 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 22 nF ceramic capacitor between BOOT and 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 cathode node; used for open-circuit protection and feedback path integrity monitoring. |
| 6 CS | Current sense input | Receives voltage across RSNS; error amplifier maintains 200 mV average here to regulate LED current. |
| 7 GND | Power and signal ground | Common return for internal circuits, CS, COMP, DIM, RON; must tie to thermal pad (DAP) for thermal and EMI performance. |
| 8 DIM | PWM dimming enable | TTL-compatible logic input (VIH = 2.2 V, VIL = 0.8 V); disables MOSFET instantly for flicker-free dimming down to 0.1% duty cycle. |
| 9 COMP | Error amplifier output | Compensation node for loop stability; requires 0.1 µF X5R/X7R ceramic to GND for standard Type II compensation. |
| 10 RON | On-time programming | Resistor from RON to VIN sets tON ≈ 1×10⁻¹¹ × RON × VO; determines base switching frequency and light-load behavior. |
| 11 VCC | Internal LDO output | 7 V regulated supply for gate driver and analog circuitry; bypass with 0.1 µF ceramic close to pin; UVLO at 5.3 V. |
| 12 VINS | Input voltage dimming comparator | Detects 70% VIN drop for two-wire PWM dimming; enables dimming without separate control wire. |
| 13,14 VIN | Main input supply | Primary power input (6–75 V); supplies internal LDO and high-side driver; connects to input capacitor (CIN) and ESD protection. |
| DAP | Thermal pad | Exposed copper pad under package; must be soldered to PCB ground plane with ≥4 thermal vias for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| True average current control | Maintains 200 mV average at CS pin using transconductance error amplifier, delivering ±3% LED current accuracy over temperature and line. |
| Dual PWM dimming interface | Supports both logic-level DIM pin (fastest response) and VINS comparator (two-wire simplicity), enabling flexible system-level dimming architecture. |
| Integrated 2.0-A MOSFET | Eliminates external switch and driver complexity; RDS-ON = 0.37 Ω (typ) minimizes conduction loss and simplifies thermal design. |
| Controlled-on-time (COT) architecture | Modulates tON inversely with VIN and VO to stabilize switching frequency in CCM, improving EMI predictability and transient response. |
| Robust protection suite | Includes cycle-by-cycle current limit (2.1 A), CS overvoltage clamp (300 mV), thermal shutdown (165°C), and BOOT UVLO (1.7 V). |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 6–12 series-connected white InGaN LEDs in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current buck regulator providing 1.2 A at 36–48 V output, with fast DIM-pin dimming for cornering and city/highway modes. Use Value: Enables precise lumen output control across wide input (9–16 V battery) and temperature (−40°C to +125°C ambient) ranges per AEC-Q100 Grade 1 compliance. | Use Scenario: Powering multi-string LED arrays in warehouse ceiling fixtures operating from 24–48 V DC distribution buses. IC Role / Device Role / Timing Role: Primary current source regulating 1.5 A per channel; multiple LM3406HVMHX/NOPB units drive parallel strings for redundancy and scalability. Use Value: Supports all-ceramic output capacitors and capacitor-less operation, reducing BOM cost and eliminating electrolytic lifetime concerns in high-temperature environments. |
| Streetlight LED Driver | UV-C Disinfection Module |
Use Scenario: Outdoor LED streetlight with 12–24 V solar/battery backup and 72–100 V PoE or DC grid input. IC Role / Device Role / Timing Role: Buck controller managing variable input (6–75 V) while maintaining constant 1.0 A output to high-VF phosphor-converted amber LEDs. Use Value: Wide VIN range eliminates need for auxiliary pre-regulators; thermal shutdown and open-circuit protection ensure field reliability in unattended installations. | Use Scenario: Driving high-forward-voltage (≥7 V) UV-C LEDs (275 nm) in portable disinfection wands requiring precise current stability. IC Role / Device Role / Timing Role: Precision current source with <±3% output tolerance; uses CS pin feedback and low-noise COMP compensation for minimal current ripple. Use Value: 200 mV sense threshold enables use of ultra-low-value RSNS (e.g., 0.2 Ω), minimizing self-heating and drift in compact, thermally constrained enclosures. |
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 |
|---|---|---|---|
| LM3406HV-Q1 | AEC-Q100 Grade 1 qualified; same pinout and electrical specs, but rated for −40°C to +150°C junction and −40°C to +125°C ambient. | Required for automotive safety-critical lighting (e.g., brake lamps, DRLs); not needed for non-automotive industrial use. | Select LM3406HV-Q1 only if AEC-Q100 qualification and extended temperature operation are mandatory. |
| TPS92691QPWPRQ1 | Higher integration: includes internal MOSFET, current sense amp, and analog/digital dimming; 4.5–65 V VIN; 1.5 A max. | Offers I²C programmability and fault reporting; suited for smart lighting with diagnostics, not basic constant-current drive. | Choose TPS92691QPWPRQ1 when digital control, telemetry, or tighter current matching across channels is required. |
Compared with LM3406HV-Q1, the LM3406HVMHX/NOPB lacks automotive qualification but offers identical performance at lower cost for industrial and commercial lighting. Versus TPS92691QPWPRQ1, it provides simpler analog-only control with lower BOM count and no firmware dependency.
Availability
LM3406HVMHX/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and outdoor streetlight systems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM3406HVMHX/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM3406 family was designed as a monolithic constant-current buck regulator targeting high-reliability LED lighting in harsh environments, with emphasis on wide input range, thermal robustness, and dual-dimming flexibility.
FAQ
What is the maximum input voltage supported by the LM3406HVMHX/NOPB?
The LM3406HVMHX/NOPB supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings and recommended operating conditions. This 6–75 V range enables direct operation from 48 V industrial buses and 60 V automotive transients without external pre-regulation. Exceeding 75 V risks permanent damage to the VIN, VINS, and VOUT pins.
How is LED current set on the LM3406HVMHX/NOPB?
LED current is set by an external sense resistor (RSNS) connected between the CS pin and ground. The LM3406HVMHX/NOPB regulates the voltage at the CS pin to 200 mV (typical), so the LED current is calculated as IF = 0.2 V / RSNS. For example, a 0.2 Ω resistor sets IF = 1.0 A. The device's true average current control ensures accuracy across temperature and line variations.
Does the LM3406HVMHX/NOPB support PWM dimming, and how is it implemented?
Yes, the LM3406HVMHX/NOPB supports two independent PWM dimming methods: (1) logic-level input on the DIM pin (VIH = 2.2 V, VIL = 0.8 V), enabling sub-microsecond turn-on/off for flicker-free dimming; and (2) input-voltage sensing via the VINS pin, which triggers dimming when VIN drops below 70% of its nominal value-ideal for two-wire systems. Both methods keep internal bias circuitry active for fast recovery.
What package type and thermal requirements apply to the LM3406HVMHX/NOPB?
The LM3406HVMHX/NOPB uses a 14-pin TSSOP package with exposed thermal pad (DAP). To achieve the specified θJA of 50°C/W, the DAP must be soldered to a PCB ground plane with at least four 0.3-mm-diameter thermal vias connecting to an internal or bottom-layer ground plane covering ≥2 in² of 1-oz copper. Failure to implement this degrades thermal performance and risks premature thermal shutdown.
Can the LM3406HVMHX/NOPB operate without an output capacitor?
Yes, the LM3406HVMHX/NOPB supports capacitor-less output operation due to its direct inductor-to-LED connection and inherent current-source behavior. This reduces BOM cost and eliminates electrolytic capacitor aging concerns. However, an output capacitor may still be added for improved ripple suppression or open-circuit protection-TI recommends all-ceramic types up to 10 µF for stability and EMI reduction.
LM3406HVMHX/NOPB 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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM3406HVMHX/NOPB FAQ
1.How can I place an order for LM3406HVMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3406HVMHX/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 LM3406HVMHX/NOPB reliable?
The price and inventory of LM3406HVMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3406HVMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3406HVMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3406HVMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3406HVMHX/NOPB?
LM3406HVMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3406HVMHX/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 LM3406HVMHX/NOPB?
For technical support, including LM3406HVMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3406HVMHX/NOPB requirements.
6.How does Aetrix verify that LM3406HVMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3406HVMHX/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 LM3406HVMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3406HVMHX/NOPB?
All LM3406HVMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3406HVMHX/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 LM3406HVMHX/NOPB part is unused and in its original packaging.
Return procedure for LM3406HVMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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