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Texas Instruments LM3404HVMRX/NOPB
- Part No.:
- LM3404HVMRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3404HVMRX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,752
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Product details
Overview
LM3404HVMRX/NOPB from Texas Instruments is a 1-A constant-current buck LED driver IC with integrated high-side N-channel MOSFET, 6 V to 75 V input voltage range, 200 mV current-sense threshold, and hysteretic controlled-on-time (COT) architecture. It delivers precise current to high-power LED arrays in automotive headlamps and industrial lighting systems.
For engineers reviewing the LM3404HVMRX/NOPB datasheet, LM3404HVMRX/NOPB pinout, LM3404HVMRX/NOPB application, or LM3404HVMRX/NOPB equivalent, key selection considerations include VIN range compatibility (up to 75 V), thermal shutdown at 165°C, PWM dimming support via DIM pin, and SO PowerPAD-8 package thermal performance (RθJB = 24.5°C/W).
Technical Context
The LM3404HVMRX/NOPB implements a controlled-on-time (COT) hysteretic regulator architecture that eliminates need for external loop compensation. Its on-time is programmable via RON and inversely scales with input voltage, enabling stable operation across 6–75 V input while maintaining constant switching frequency in continuous conduction mode (CCM).
It integrates a 7-V internal linear regulator (VCC), bootstrap gate drive for the internal MOSFET (RDS(on) = 0.37–0.75 Ω), and dual protection comparators: current-sense overvoltage (300 mV) and thermal shutdown (165°C/25°C hysteresis). The CS pin senses LED current via external resistor with 200 mV regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports 12 V, 24 V, and 48 V industrial/automotive bus rails without pre-regulation. |
| Output Current | 1.2 A (overtemperature-limited) - delivers full rated LED current up to 125°C junction temperature. |
| CS Threshold | 200 mV ±3 mV - sets LED current as IF = 0.2 V / RSNS; enables <1% current accuracy with precision sense resistor. |
| Switch RDS(on) | 0.37 Ω (typ) - minimizes conduction loss at 1 A; supports >90% efficiency in typical 24 V → 18 V LED string designs. |
| Thermal Shutdown | 165°C (typ), 25°C hysteresis - protects die during overload or poor heatsinking; automatic recovery after cooldown. |
| Dimming Interface | TTL-compatible DIM pin (VIL ≤ 0.8 V, VIH ≥ 2.2 V) - enables direct microcontroller PWM control without level-shifting. |
| Package Thermal RθJB | 24.5°C/W - enables high-power operation with minimal PCB copper; 4–6 vias to ground plane required under PowerPAD. |
Pinout & Package
LM3404HVMRX/NOPB is housed in an SO PowerPAD-8 package (3.90 mm × 4.89 mm) with exposed thermal pad (DAP) requiring connection to PCB ground plane via 4–6 thermal vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor and Schottky diode cathode; carries high-frequency pulsed current; requires low-inductance layout. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor between BOOT and SW for floating bias generation. |
| DIM | PWM dimming input | Logic-level enable/disable control; 75 µA internal pullup ensures default ON state when left open. |
| GND | Power and signal ground | Reference for all analog circuits; must be tied to system ground with low-impedance path. |
| CS | Current sense feedback | Monitors voltage across RSNS; regulates LED current by comparing to 200 mV internal reference. |
| RON | On-time programming | Resistor from RON to VIN sets tON; determines switching frequency and maximum output voltage capability. |
| VCC | Internal bias supply | 7-V regulated output; must be bypassed with ≥0.1 µF X5R/X7R ceramic capacitor close to pin. |
| VIN | Main power input | Supplies both power stage and internal circuitry; accepts 6–75 V DC; powers VCC regulator until 8.8 V, then regulates. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates external compensation network - reduces BOM count and design iteration time. |
| All-ceramic or capacitor-less output | Stable with zero output capacitance - enables ultra-compact LED driver layouts and eliminates electrolytic capacitor reliability concerns. |
| Open-LED protection | CS comparator disables switch if VSNS drops below 200 mV - prevents runaway duty cycle during LED string breakage. |
| Integrated 1.5-A MOSFET | On-chip high-side switch eliminates external FET and gate driver - simplifies layout and improves EMI performance. |
| Separate shutdown & dimming | RON pin enables low-power shutdown (IIN = 95 µA); DIM pin enables fast PWM dimming without affecting bias - supports independent system control. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: High-intensity directional lighting for vehicle forward illumination with adaptive beam shaping. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1–3 series high-brightness LEDs (e.g., Cree XP-G3) at 700 mA–1 A. Use Value: 75 V max input withstands load-dump transients; thermal shutdown protects against enclosure overheating; PWM dimming enables dynamic light output control. | Use Scenario: Uniform, flicker-free illumination for high-speed camera inspection of PCBs or mechanical parts. IC Role / Device Role / Timing Role: Precision current source driving parallel LED strings with tight current matching across channels. Use Value: 200 mV CS threshold enables ±1% current accuracy; no-loop-compensation allows rapid design validation; SO PowerPAD enables forced-air-cooled compact modules. |
| Streetlight LED Drivers | Architectural Accent Lighting |
Use Scenario: Outdoor LED luminaires powered from 48 V DC or PoE++ infrastructure with extended thermal cycling. IC Role / Device Role / Timing Role: Primary current regulator in isolated or non-isolated buck-based streetlight driver topology. Use Value: 6–75 V input accommodates wide-range DC distribution; RθJB = 24.5°C/W sustains 1 A output at 85°C ambient; open-LED protection prevents overvoltage failure in field. | Use Scenario: Low-profile linear LED strips for interior building features requiring smooth dimming and color consistency. IC Role / Device Role / Timing Role: Constant-current source for single-color or tunable-white LED modules with analog + PWM hybrid dimming. Use Value: DIM pin supports 100–1000 Hz PWM without audible noise; all-ceramic output eliminates capacitor aging; 75 µA DIM pullup simplifies control interface. |
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 |
|---|---|---|---|
| LM3404MRX/NOPB | Lower VIN range (6–42 V); identical pinout, package, and feature set except input voltage rating. | Suitable only for 12/24 V systems; not rated for 48 V+ or automotive load-dump conditions. | Select LM3404MRX/NOPB only when input never exceeds 42 V and cost sensitivity outweighs voltage margin. |
| MPQ4425HGQ-P | 40 V max VIN; integrated current sense amplifier; I²C programmable current; QFN-16 package. | Requires digital interface and layout redesign; offers programmability but lacks 75 V robustness and SO PowerPAD thermal performance. | Choose MPQ4425HGQ-P when system-level current tuning or telemetry is required and 40 V input suffices. |
Compared with LM3404MRX/NOPB, LM3404HVMRX/NOPB adds 33 V headroom for transient tolerance and field reliability; versus MPQ4425HGQ-P, it trades digital flexibility for analog simplicity, higher voltage rating, and superior thermal dissipation in compact SOIC form factor.
Availability
LM3404HVMRX/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision systems, and outdoor streetlight deployments requiring stable component supply across multi-year production cycles.
Supply support for LM3404HVMRX/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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM3404HV product line was designed specifically for high-reliability constant-current LED driving in harsh environments - emphasizing wide-input-voltage operation, integrated protection, and thermally robust packaging for automotive and industrial lighting.
FAQ
What is the maximum input voltage rating for LM3404HVMRX/NOPB?
The LM3404HVMRX/NOPB is rated for a maximum input voltage of 75 V, as specified in its absolute maximum ratings table. This distinguishes it from the standard LM3404 (42 V max) and makes it suitable for 48 V DC systems subject to load-dump transients. Operation above 75 V risks permanent damage; the device enters shutdown if VIN exceeds this limit.
Does LM3404HVMRX/NOPB require external compensation components?
No, LM3404HVMRX/NOPB does not require external compensation components. Its controlled-on-time (COT) hysteretic architecture inherently stabilizes the control loop without feedback compensation networks. This eliminates the need for external resistors, capacitors, or op-amps in the compensation path - reducing bill-of-materials count and layout complexity.
How is LED current set in LM3404HVMRX/NOPB?
LED current in LM3404HVMRX/NOPB is set by an external current-sense resistor (RSNS) connected between the CS pin and ground. The device regulates current so that the voltage at CS equals its internal 200 mV reference, yielding IF = 0.2 V / RSNS. For example, a 200 mΩ resistor sets 1 A output current. Accuracy depends on RSNS tolerance and temperature coefficient.
Can LM3404HVMRX/NOPB operate without an output capacitor?
Yes, LM3404HVMRX/NOPB supports capacitor-less operation due to its current-regulator topology and inherent stability. The inductor directly controls LED current ripple, eliminating need for output capacitance to maintain regulation. A small 10 nF capacitor across the LED array may be added to dampen high-frequency ringing, but bulk capacitance is optional and not required for basic functionality.
What thermal management is required for LM3404HVMRX/NOPB at 1 A output?
At 1 A output, LM3404HVMRX/NOPB requires connection of its exposed PowerPAD (DAP) to the PCB ground plane using 4–6 thermal vias. With this configuration and 1 oz copper, its junction-to-board thermal resistance is 24.5°C/W. At 125°C max junction temperature and 85°C ambient, it can dissipate ~1.6 W - sufficient for typical 24 V → 18 V LED string applications with proper board layout.
LM3404HVMRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm 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:
- 73V
- Current - Output / Channel:
- 1A
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM3404HVMRX/NOPB FAQ
1.How can I place an order for LM3404HVMRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3404HVMRX/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 LM3404HVMRX/NOPB reliable?
The price and inventory of LM3404HVMRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3404HVMRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3404HVMRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3404HVMRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3404HVMRX/NOPB?
LM3404HVMRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3404HVMRX/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 LM3404HVMRX/NOPB?
For technical support, including LM3404HVMRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3404HVMRX/NOPB requirements.
6.How does Aetrix verify that LM3404HVMRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3404HVMRX/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 LM3404HVMRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3404HVMRX/NOPB?
All LM3404HVMRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3404HVMRX/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 LM3404HVMRX/NOPB part is unused and in its original packaging.
Return procedure for LM3404HVMRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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