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Texas Instruments LM3414MRX/NOPB
- Part No.:
- LM3414MRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3414MRX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,543
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Product details
Overview
LM3414MRX/NOPB from Texas Instruments is a 1-A, 60-W constant-current buck LED driver with integrated low-side N-channel MOSFET and no external current-sense resistor required. It delivers ±3% LED current accuracy, supports 4.5 V to 42 V input, operates at 250–1000 kHz switching frequency, and enables PWM/thermal fold-back/analog dimming for high-power architectural lighting and MR-16 LED lamps.
For engineers reviewing the LM3414MRX/NOPB datasheet, LM3414MRX/NOPB pinout, LM3414MRX/NOPB application, or LM3414MRX/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), adjustable output current (350–1000 mA), thermal shutdown (170°C), PLM-based average current regulation, and SOIC-8 package compatibility with exposed thermal pad.
Technical Context
The LM3414MRX/NOPB implements proprietary Pulse-Level-Modulation (PLM) control to regulate average LED current by sensing internal switch current during ON-time only-enabling true average current control without output-side sensing. Its integrated 1.8-Ω N-MOSFET and internal 5.4-V VCC regulator eliminate bootstrapping capacitors and external bias supplies.
It operates strictly in continuous conduction mode (CCM) with a 400 ns minimum ON-time constraint; switching frequency is set via external RFS (250–1000 kHz), and LED current is adjusted via RIADJ (350–1000 mA). Thermal fold-back and analog dimming are implemented through IADJ pin biasing, while DIM pin accepts logic-level PWM signals down to 9-µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V DC - supports wide-range industrial and automotive LED power rails without pre-regulation. |
| Max Output Current | 1.0 A ±3% - precise constant-current drive for single-string high-brightness LED arrays up to 60 W. |
| Switching Frequency | 250 kHz to 1000 kHz - adjustable via RFS for EMI optimization and inductor size reduction. |
| LED Current Accuracy | ±3% over –40°C to +125°C - ensures consistent luminance across temperature and line variations. |
| Min ON-Time | 400 ns - constrains minimum duty cycle and sets practical lower limit on LED string voltage vs VIN ratio. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects device and PCB during overload or poor heatsinking conditions. |
| VCC Regulator | 5.4 V output, 2 mA max load - powers internal circuitry and supports external biasing without auxiliary supply. |
Pinout & Package
LM3414MRX/NOPB uses the Power Enhanced SOIC-8 (DDA) package with 3.90 mm × 4.89 mm body and exposed thermal pad (EP) that must be connected to PGND for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 8) | Input voltage supply | Accepts 4.5–42 V DC; connects to bulk input capacitor and high-side of inductor. |
| LX (Pin 7) | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode. |
| DIM (Pin 6) | PWM dimming input | Logic-level control: >1.2 V enables, <0.9 V disables switching; supports 9-µs min pulse width. |
| FS (Pin 5) | Frequency setting input | Connects to ground via RFS (20–80 kΩ) to set switching frequency from 250–1000 kHz. |
| PGND (Pin 2) | Power ground | Reference for high-current paths; must be externally tied to EP and GND. |
| IADJ (Pin 3) | Current adjustment input | 1.255 V reference node; RIADJ to GND sets LED current (350–1000 mA); supports analog dimming. |
| GND (Pin 4) | Analog ground | Low-noise reference for internal circuitry; must connect externally to PGND. |
| VCC (Pin 1) | Internal regulator output | 5.4 V supply for gate drive and control logic; requires ≥1 µF ceramic bypass to GND. |
| EP | Thermal pad | Electrically tied to PGND; primary heat dissipation path-must be soldered to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Reduces BOM count and power loss-PLM senses internal switch current only during ON-time, cutting I²R losses by ~50% vs conventional sensing. |
| Integrated low-side N-MOSFET | 1.8 Ω RDS(on) enables 1-A operation in SOIC-8 without external FET or driver, simplifying layout and reducing footprint. |
| Pulse-Level-Modulation (PLM) | Ensures true average LED current regulation independent of LED forward voltage drift or temperature variation. |
| Adjustable constant current (350–1000 mA) | Set precisely via single RIADJ resistor (0.5% tolerance recommended); enables flexible LED string design without re-layout. |
| Thermal fold-back and shutdown | Automatically reduces LED current above threshold and shuts down at 170°C-prevents thermal runaway in enclosed fixtures. |
Applications
| Architectural Lighting | Office Troffer Systems |
|---|---|
|
Use Scenario: Linear LED modules mounted in suspended ceiling grids for uniform ambient illumination. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1-A drive for multi-LED strings in common-anode configuration. Use Value: Delivers 96% efficiency and ±3% current accuracy across 4.5–42 V input, enabling direct connection to 24/36/48 V building power rails. |
Use Scenario: High-lumen troffer fixtures with 6–12 high-power LEDs per string, requiring thermal management and dimming. IC Role / Device Role / Timing Role: Primary LED current regulator with integrated thermal fold-back and PWM dimming interface. Use Value: Supports 240-Hz 256-step dimming resolution via 9-µs DIM pulses and maintains stable current during ambient temperature shifts. |
| Automotive Exterior Lighting | MR-16 LED Replacement Lamps |
|
Use Scenario: Tail lamps and daytime running lights (DRL) powered from 12 V vehicle battery with load-dump transients. IC Role / Device Role / Timing Role: Robust buck LED driver with 42 V absolute max input rating and transient protection up to 45 V (500 ms). Use Value: Withstands automotive load-dump events without external TVS; 170°C thermal shutdown prevents failure under sealed housing conditions. |
Use Scenario: Retrofit MR-16 halogen replacement with AC/DC adapter or 12 V DC input, constrained by small form factor. IC Role / Device Role / Timing Role: Compact, self-contained LED driver in SOIC-8 package driving single 1-A LED string. Use Value: Eliminates external sense resistor and compensation network-reducing solution size by >30% versus discrete alternatives. |
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 |
|---|---|---|---|
| LM3414HVMM/NOPB | Wider 4.5–65 V input range; identical pinout and features; higher transient rating (67 V/500 ms). | Suitable for 48 V telecom or industrial systems where input exceeds 42 V; same SOIC-8 footprint. | Select when input voltage may exceed 42 V-no layout change required, but verify thermal derating at higher VIN. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified; 65 V max input; integrated diagnostics and fault reporting; 3.3 V logic-compatible DIM. | Required for ASIL-B automotive lighting; adds open/short LED detection and I²C programmability. | Choose for safety-critical vehicle applications needing diagnostic coverage and extended temp range (–40°C to +125°C). |
Compared with LM3414MRX/NOPB, LM3414HVMM/NOPB extends input range without changing design, while TPS92630QPWPRQ1 adds automotive qualification and diagnostics at the cost of increased complexity and cost-making LM3414MRX/NOPB optimal for cost-sensitive industrial and commercial lighting.
Availability
LM3414MRX/NOPB is available at Aetrix Electronics and suitable for architectural lighting, office troffer systems, and MR-16 LED lamp designs requiring stable component supply, long-term manufacturability, and SOIC-8 thermal reliability.
Supply support for LM3414MRX/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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
The LM3414MRX/NOPB belongs to TI's high-efficiency LED driver product line, engineered specifically for cost-sensitive, thermally constrained constant-current lighting applications requiring minimal external components and high reliability.
FAQ
What is the maximum input voltage supported by the LM3414MRX/NOPB?
The LM3414MRX/NOPB supports a maximum continuous input voltage of 42 V DC, with transient capability up to 45 V for 500 ms. This rating is defined in the Absolute Maximum Ratings table and applies across the full operating temperature range. Exceeding 42 V continuously risks permanent damage, and the device lacks internal overvoltage protection beyond this limit-external clamping is recommended for harsh environments.
How is LED current set on the LM3414MRX/NOPB?
LED current on the LM3414MRX/NOPB is set by connecting a precision resistor (RIADJ) between the IADJ pin and GND. The internal 1.255 V reference generates a current through RIADJ, which directly determines average LED current via ILED = 3125 / RIADJ (in mA, with RIADJ in kΩ). For 1 A output, RIADJ = 3.125 kΩ (0.5% tolerance recommended). Shorting IADJ to GND limits current to protect the circuit.
Does the LM3414MRX/NOPB require an external current-sense resistor?
No, the LM3414MRX/NOPB does not require an external current-sense resistor. It uses proprietary Pulse-Level-Modulation (PLM) to regulate average LED current by sensing the internal N-MOSFET's switch current during ON-time only. This eliminates I²R losses associated with external sense resistors and reduces component count-enabling higher efficiency (up to 96%) and simpler PCB layout compared to traditional buck LED drivers.
What package type is used for the LM3414MRX/NOPB?
The LM3414MRX/NOPB is packaged in the Power Enhanced SOIC-8 (DDA) package, measuring 3.90 mm × 4.89 mm with an exposed thermal pad (EP). This package provides superior thermal performance over standard SOIC-8 due to the EP's direct connection to PGND, enabling reliable 1-A operation at ambient temperatures up to +85°C with appropriate PCB copper area.
Can the LM3414MRX/NOPB support both PWM and analog dimming?
Yes, the LM3414MRX/NOPB supports both PWM dimming via the DIM pin (logic-level input, 9-µs minimum pulse width) and analog dimming via the IADJ pin. Analog dimming is achieved by injecting external bias current into IADJ, linearly reducing LED current from 100% down to 100 mA. Both methods operate simultaneously-PWM controls frame-level brightness, while analog adjusts baseline current level for fine thermal or ambient-light compensation.
LM3414MRX/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):
- 4.5V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- Frequency:
- 500kHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM3414MRX/NOPB FAQ
1.How can I place an order for LM3414MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3414MRX/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 LM3414MRX/NOPB reliable?
The price and inventory of LM3414MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3414MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3414MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3414MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3414MRX/NOPB?
LM3414MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3414MRX/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 LM3414MRX/NOPB?
For technical support, including LM3414MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3414MRX/NOPB requirements.
6.How does Aetrix verify that LM3414MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3414MRX/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 LM3414MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3414MRX/NOPB?
All LM3414MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3414MRX/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 LM3414MRX/NOPB part is unused and in its original packaging.
Return procedure for LM3414MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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