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Texas Instruments LM3406HVMH/NOPB
- Part No.:
- LM3406HVMH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3406HVMH/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:868
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Product details
Overview
LM3406HVMH/NOPB from Texas Instruments is a monolithic 1.5-A constant-current buck LED driver with integrated 2.0-A N-channel MOSFET, 6 V to 75 V input range, true average current control via external sense resistor, and dedicated PWM dimming logic input - designed for automotive headlamps and high-brightness industrial lighting systems.
For engineers reviewing the LM3406HVMH/NOPB datasheet, LM3406HVMH/NOPB pinout, LM3406HVMH/NOPB application, or LM3406HVMH/NOPB equivalent, key selection considerations include its 200 mV CS regulation threshold, 280 ns minimum on-time, thermal shutdown at 165°C, TSSOP-14 exposed-pad package, and compatibility with all-ceramic or capacitor-less output configurations.
Technical Context
The LM3406HVMH/NOPB implements controlled-on-time (COT) architecture with inverse VIN/VO modulation to maintain stable switching frequency in continuous conduction mode. Its transconductance error amplifier (145 µS) regulates average current by holding CS pin voltage at 200 mV ±10 mV across temperature.
It integrates a 7-V linear regulator (VCC), bootstrap gate driver (BOOT–SW UVLO at 1.7–4.3 V), cycle-by-cycle current limit (1.7–2.7 A), and dual-dimming capability: TTL-compatible DIM pin (VIH = 2.2 V, VIL = 0.8 V) and VINS comparator for two-wire PWM dimming (70% VIN threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports 12 V/24 V/48 V automotive and industrial bus rails without pre-regulation. |
| Output Current | Up to 1.5 A DC - set precisely via RSNS = 0.2 V / IF; maintains ±5% accuracy over load/temperature. |
| CS Threshold | 200 mV (typical) - defines LED current setpoint; 191–210 mV min/max ensures tight current matching across units. |
| Min On-time | 280 ns (typical) - enables high-frequency operation (>350 kHz at VIN=24 V, VO=12 V) and fast transient response. |
| Thermal Shutdown | 165°C (typical), 25°C hysteresis - protects die during overload or poor heatsinking; resumes operation after cooldown. |
| RDS(on) | 0.37 Ω (typical) - reduces conduction loss in internal MOSFET; enables >90% efficiency at 1 A with proper layout. |
| θJA | 50°C/W - achievable with DAP soldered to ≥2 in² of 1-oz copper; enables 1.5 A operation at TA ≤ 85°C. |
Pinout & Package
TSSOP-14 with exposed thermal pad (Package Number PWP0014A); DAP must be connected to PCB 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 anode; carries high di/dt pulsed current; requires short, low-inductance routing. |
| 3 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 22 nF ceramic cap to SW; UVLO disables gate drive if BOOT–SW < 1.7 V. |
| 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 drop across RSNS; sets LED current via 200 mV reference; OVP triggers at 300 mV. |
| 7 GND | Power and signal ground | Common return for CS, COMP, DIM, RON; must tie to DAP and system ground with low-impedance path. |
| 8 DIM | PWM dimming enable | TTL-compatible 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; sets bandwidth and phase margin. |
| 10 RON | On-time programming | Resistor from RON to VIN sets tON ≈ 1×10⁻¹¹ × RON × VO; determines nominal switching frequency. |
| 11 VCC | Internal bias supply | 7 V regulated output; bypass with 0.1 µF ceramic; UVLO activates below 5.3 V; powers gate driver and analog circuitry. |
| 12 VINS | Input voltage dimming sense | Enables two-wire PWM dimming; triggers shutdown when VINS < 70% VIN; requires external input diode. |
| 13,14 VIN | Main power input | Accepts 6–75 V; supplies internal LDO and gate driver; minimum 10 µF ceramic input capacitance required. |
Key Features
| Feature | Design Value |
|---|---|
| True average current control | Maintains 1.5 A LED current within ±5% over line/load/temperature via integrator-based CS regulation at 200 mV. |
| Dual PWM dimming interface | Supports both logic-level DIM pin (2.2 V/0.8 V thresholds) and VINS comparator (70% VIN threshold) for flexible system-level dimming. |
| Capacitor-less output capability | Stable operation without output capacitor due to COT architecture and inherent current-loop dominance; reduces BOM cost and size. |
| Integrated 2.0-A MOSFET | Eliminates external switch; RDS(on) = 0.37 Ω typ minimizes conduction loss; thermal shutdown prevents latch-up under fault. |
| Robust protection suite | Includes cycle-by-cycle current limit (2.1 A typ), CS overvoltage clamp (300 mV), thermal shutdown (165°C), and BOOT UVLO. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: High-intensity forward lighting in passenger vehicles and commercial trucks requiring AEC-Q100 compliance and 125°C ambient operation. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1.5 A through 4–8 series InGaN LEDs; manages thermal derating and EMI-constrained switching frequency. Use Value: Enables single-chip solution for adaptive driving beams with fast PWM dimming (DIM pin), eliminating need for external current-sense amplifiers or controllers. | Use Scenario: Stroboscopic illumination for high-speed inspection cameras where precise current stability and minimal ripple are critical for image fidelity. IC Role / Device Role / Timing Role: Precision current source delivering 1.5 A ±2% with <10% peak-to-peak ripple; operates at fixed 300–500 kHz to avoid camera frame-rate aliasing. Use Value: Supports capacitor-less output design to eliminate aging-related drift; true average current control ensures consistent photon flux across temperature and unit variance. |
| Outdoor Street Lighting | Architectural Accent Lighting |
Use Scenario: Outdoor LED luminaires exposed to wide ambient temperature swings (−40°C to +85°C) and long operational lifetimes. IC Role / Device Role / Timing Role: Primary LED driver in isolated AC/DC + DC/DC architecture; handles 48 V DC input; provides thermal foldback and open-circuit protection. Use Value: Integrated thermal shutdown (165°C) and robust 75 V VIN rating ensure reliability in unventilated enclosures; DAP thermal pad simplifies heatsink integration. | Use Scenario: Low-profile indoor fixtures requiring silent, flicker-free dimming across 0.1–100% range without audible coil whine. IC Role / Device Role / Timing Role: Constant-current source with dual-dimming support: slow analog dimming via VINS, fast digital dimming via DIM pin for scene transitions. Use Value: 280 ns minimum on-time enables >1 MHz operation for ultrasonic dimming frequencies; eliminates perceptible flicker and acoustic noise. |
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; junction temp rated to 150°C; shutdown threshold slightly higher (0.7–1.066 V vs. 0.7–1.05 V). | Required for automotive safety-critical lighting; supports extended ambient (−40°C to +125°C) with tighter thermal margins. | Select LM3406HV-Q1 only when AEC-Q100 qualification and 150°C junction rating are mandatory; otherwise LM3406HVMH/NOPB suffices. |
| LT3474EFE#PBF | 40 V max VIN; 1.25 A max output; uses voltage-mode control; requires external MOSFET; no integrated VCC LDO. | Better suited for lower-voltage industrial lighting where input is regulated to ≤40 V; offers adjustable frequency and soft-start. | Choose LT3474EFE#PBF when higher VIN tolerance is unnecessary and external FET flexibility or soft-start is prioritized over integration. |
Compared with LM3406HV-Q1, LM3406HVMH/NOPB lacks AEC-Q100 certification but matches all electrical specs and thermal performance up to 125°C ambient; versus LT3474EFE#PBF, it delivers higher integration (MOSFET + VCC LDO) and wider VIN range at the cost of fixed control architecture.
Availability
LM3406HVMH/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision lighting, and outdoor street lighting requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM3406HVMH/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, embedded processing, and power management ICs, with leadership in automotive, industrial, and lighting solutions.
The LM3406 family was designed specifically as a highly integrated, thermally robust constant-current buck driver for high-power LEDs - targeting applications where reliability, efficiency, and dimming flexibility outweigh cost sensitivity.
FAQ
What is the maximum input voltage supported by the LM3406HVMH/NOPB?
The LM3406HVMH/NOPB supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings and recommended operating conditions. This allows direct operation from 48 V industrial buses or 60 V automotive transients without external pre-regulation. Exceeding 75 V risks permanent damage to the internal MOSFET and gate driver circuitry.
How is LED current set on the LM3406HVMH/NOPB?
LED current is set by an external sense resistor (RSNS) connected between the CS pin and ground. The LM3406HVMH/NOPB regulates the voltage at the CS pin to 200 mV (typical), so the output current is calculated as IF = 0.2 V / RSNS. For example, a 0.133 Ω resistor sets 1.5 A output current. The LM3406HVMH/NOPB's true average current control ensures this remains accurate across temperature and line variations.
Does the LM3406HVMH/NOPB support PWM dimming, and how is it implemented?
Yes, the LM3406HVMH/NOPB supports two independent PWM dimming methods: (1) logic-level input via the DIM pin (TTL compatible, VIH = 2.2 V, VIL = 0.8 V), and (2) input-voltage sensing via the VINS pin (triggers at 70% VIN). Both methods disable the internal MOSFET while keeping bias circuitry active for fast recovery. The LM3406HVMH/NOPB does not require external components for basic DIM operation due to its 75 µA internal pull-up.
What package type and thermal requirements apply to the LM3406HVMH/NOPB?
The LM3406HVMH/NOPB uses a 14-pin TSSOP package with exposed thermal pad (PWP0014A). To achieve the specified θJA of 50°C/W, the DAP must be soldered to a minimum of 2 square inches of 1-oz copper on the PCB, connected via 4–6 thermal vias to an internal or bottom-layer ground plane. Failure to implement this results in excessive junction temperature and premature thermal shutdown.
Can the LM3406HVMH/NOPB operate without an output capacitor?
Yes, the LM3406HVMH/NOPB supports capacitor-less output operation due to its controlled-on-time architecture and current-mode dominance, which ensures stability without output capacitance. This is validated in TI's application notes and typical performance curves. However, an output capacitor may still be added to reduce LED current ripple or improve transient response - especially in high-EMI environments or when driving long LED strings.
LM3406HVMH/NOPB 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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM3406HVMH/NOPB FAQ
1.How can I place an order for LM3406HVMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3406HVMH/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 LM3406HVMH/NOPB reliable?
The price and inventory of LM3406HVMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3406HVMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3406HVMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3406HVMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3406HVMH/NOPB?
LM3406HVMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3406HVMH/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 LM3406HVMH/NOPB?
For technical support, including LM3406HVMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3406HVMH/NOPB requirements.
6.How does Aetrix verify that LM3406HVMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3406HVMH/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 LM3406HVMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3406HVMH/NOPB?
All LM3406HVMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3406HVMH/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 LM3406HVMH/NOPB part is unused and in its original packaging.
Return procedure for LM3406HVMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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