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Texas Instruments LM3414MR/NOPB
- Part No.:
- LM3414MR/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3414MR/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
LM3414MR/NOPB from Texas Instruments is a 1-A, 60-W common-anode-capable constant-current buck LED driver IC with integrated low-side N-channel MOSFET, ±3% LED current accuracy, 4.5 V to 42 V input range, and adjustable switching frequency from 250 kHz to 1000 kHz. It drives high-power LED arrays in architectural lighting and MR-16 lamps without external current-sensing resistors.
For engineers reviewing the LM3414MR/NOPB datasheet, LM3414MR/NOPB pinout, LM3414MR/NOPB application, or LM3414MR/NOPB equivalent, key selection considerations include its no-RSENSE PLM control architecture, thermal fold-back via IADJ, PWM dimming support down to <10 µs pulses, and SOIC-8 package with exposed thermal pad for high-power LED thermal management.
Technical Context
The LM3414MR/NOPB implements proprietary Pulse-Level-Modulation (PLM) control to regulate average LED current by sensing internal switch current during ON-time only-enabling up to 96% efficiency and eliminating external current-sense resistor losses. It operates strictly in continuous conduction mode (CCM) and requires minimum 400 ns ON-time for accurate regulation.
Its integrated 5.4-V VCC regulator powers internal circuitry and supports external biasing (≤2 mA load); UVLO triggers at 3.75 V with 300 mV hysteresis. Thermal shutdown activates at 170°C with 10°C hysteresis, and peak switch current limiting trips at 3× ILED setpoint to protect against LED string short-circuit.
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 A ±3% - precise constant-current drive for single-string high-brightness LEDs up to 60 W |
| Switching Frequency | 250–1000 kHz - adjustable via RFS; higher frequencies enable smaller magnetics but require careful EMI layout |
| LED Current Adjustment | 350–1000 mA - set by external resistor RIADJ (3.13 kΩ for 1 A), enabling fine analog dimming and thermal fold-back |
| Efficiency | Up to 96% - achieved via integrated MOSFET, no external sense resistor, and PLM's ON-time-only sensing |
| Dimming Support | PWM dimming with <10 µs minimum pulse width - delivers >256-step contrast ratio for smooth brightness control |
| Thermal Protection | 170°C shutdown with 10°C hysteresis - prevents latch-up and enables safe recovery after overtemperature events |
Pinout & Package
LM3414MR/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 dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 4.5–42 V DC; connects to input capacitor CIN and internal regulator input |
| LX | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode in buck topology |
| DIM | PWM dimming input | Logic-level control: >1.2 V enables output, <0.9 V disables switching while keeping VCC active |
| FS | Frequency setting input | Connects to ground via RFS to set switching frequency (250–1000 kHz) |
| PGND | Power ground | Reference for high-current paths; must be externally tied to EP and GND |
| IADJ | Current adjustment input | Biased at 1.255 V; RIADJ to ground sets LED current (350–1000 mA) and enables analog dimming/fold-back |
| GND | Analog ground | Reference for internal analog circuitry; must connect externally to PGND |
| VCC | Internal regulator output | 5.4-V regulated supply; bypassed with ≥1 µF ceramic capacitor to GND for stable gate drive and control |
| EP | Thermal pad | Electrically connected to PGND; primary heat path for 1-A continuous operation in SOIC-8 |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Reduces BOM count, PCB area, and power loss-PLM senses internal switch current only during ON-time |
| Adjustable constant LED current | 350–1000 mA via single RIADJ resistor (0.5% tolerance recommended for ±3% accuracy) |
| Integrated low-side N-MOSFET | Eliminates external FET and bootstrapping components; simplifies layout and improves reliability |
| Thermal fold-back and analog dimming | Implemented via IADJ pin biasing-enables automatic current reduction with temperature rise or ambient light sensor input |
| Constant-frequency PWM control | 250–1000 kHz programmability eases EMI filtering design and allows optimization for size vs. efficiency |
Applications
| Architectural Lighting | Office Troffer Systems |
|---|---|
Use Scenario: Linear LED modules mounted in suspended ceiling grids for uniform ambient illumination in commercial offices. IC Role / Device Role / Timing Role: Constant-current buck driver regulating 1-A current across multi-LED strings with common-anode configuration. Use Value: Delivers 96% efficiency and thermal fold-back to maintain consistent lumen output across ambient temperatures from –40°C to +85°C. | Use Scenario: High-lumen-density troffer fixtures using 6–12 high-power LEDs per string in retrofit installations. IC Role / Device Role / Timing Role: Primary LED current controller with PWM dimming interface for DALI-compatible digital ballasts. Use Value: Supports <10 µs PWM pulses for 256-step dimming resolution, meeting ANSI CBEA flicker standards without added microcontroller overhead. |
| Automotive Interior Lighting | MR-16 LED Replacement Lamps |
Use Scenario: Dome, map, and courtesy lights powered from 12 V vehicle battery with transient protection. IC Role / Device Role / Timing Role: Robust buck LED driver accepting 4.5–42 V input range to handle cold-crank (6 V) and load-dump (42 V) conditions. Use Value: Integrated thermal shutdown (170°C) and overcurrent limiting prevent failure during prolonged high-temperature cabin operation. | Use Scenario: GU5.3-based directional lamps replacing halogen MR-16s in residential track lighting. IC Role / Device Role / Timing Role: Single-chip LED driver enabling compact SOIC-8 layout with minimal external components (RFS, RIADJ, inductor, diode). Use Value: Eliminates external current-sense resistor-reducing bill-of-materials cost and improving thermal performance in enclosed lamp housings. |
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 | WSON-8 package (3×3 mm), 4.5–65 V input range, identical electrical specs and PLM control | Better suited for space-constrained designs requiring higher input voltage tolerance (e.g., 48 V telecom systems) | Select when board area is limited and input exceeds 42 V; same thermal fold-back, dimming, and current accuracy apply |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified, 3.5–40 V input, 1.5 A max, integrated PWM generator, no IADJ analog dimming | Designed for automotive headlamp and DRL applications with functional safety support (no thermal fold-back via IADJ) | Choose for ASIL-B systems requiring qualification; not drop-in due to different dimming architecture and no analog fold-back |
Compared with LM3414MR/NOPB, LM3414HVMM/NOPB offers identical functionality in a smaller thermally enhanced package with extended input range, while TPS92630QPWPRQ1 provides automotive qualification and higher current but lacks the IADJ-based thermal fold-back and analog dimming flexibility.
Availability
LM3414MR/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 consistent parametric performance across production batches.
Supply support for LM3414MR/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 technologies, with leadership in high-reliability LED driver ICs for industrial and automotive markets.
The LM3414 product line delivers high-efficiency, constant-current buck drivers for high-power LED lighting applications where simplicity, thermal robustness, and analog/PWM dimming flexibility are critical design requirements.
FAQ
What is the maximum input voltage supported by LM3414MR/NOPB?
The LM3414MR/NOPB supports a maximum input voltage of 42 V DC under steady-state conditions, with transient tolerance up to 45 V for 500 ms. This rating is confirmed in the Absolute Maximum Ratings table of the SNVS678F datasheet and applies specifically to the LM3414 variant-not the HV version. Exceeding 42 V risks permanent damage to the VIN-to-PGND junction.
Does LM3414MR/NOPB require an external current-sense resistor?
No, LM3414MR/NOPB does not require an external current-sense resistor. Its proprietary Pulse-Level-Modulation (PLM) control architecture senses the internal N-MOSFET switch current during ON-time only, enabling accurate average LED current regulation without external sensing components. This eliminates power loss, BOM cost, and PCB area associated with traditional sense resistors.
How is LED current adjusted on LM3414MR/NOPB?
LED current on LM3414MR/NOPB is adjusted by connecting an external resistor (RIADJ) between the IADJ pin and GND. The IADJ pin is internally biased to 1.255 V, so ILED = 3125 / RIADJ (in mA, with RIADJ in kΩ). For example, a 3.13 kΩ resistor sets 1000 mA output. TI specifies ≤0.5% resistor tolerance to maintain ±3% current accuracy across temperature.
What package type is used for LM3414MR/NOPB?
LM3414MR/NOPB uses the Power Enhanced SOIC-8 (DDA) package with dimensions 3.90 mm × 4.89 mm and an exposed thermal pad (EP). The EP must be soldered to a PGND copper plane for effective thermal dissipation during 1-A continuous operation. This package differs from the WSON-8 used in LM3414HVMM/NOPB and is not pin-compatible with it.
Can LM3414MR/NOPB support both PWM and analog dimming?
Yes, LM3414MR/NOPB supports both PWM dimming via the DIM pin (with <10 µs minimum pulse width for high contrast) and analog dimming via the IADJ pin. Applying external bias current to IADJ linearly reduces LED current down to 100 mA, enabling thermal fold-back and ambient-light-responsive dimming. Both methods operate independently and can be combined in system-level control architectures.
LM3414MR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm 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):
- 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
LM3414MR/NOPB FAQ
1.How can I place an order for LM3414MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3414MR/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 LM3414MR/NOPB reliable?
The price and inventory of LM3414MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3414MR/NOPB is usually 5 days.
3.What payment methods are accepted for LM3414MR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3414MR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3414MR/NOPB?
LM3414MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3414MR/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 LM3414MR/NOPB?
For technical support, including LM3414MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3414MR/NOPB requirements.
6.How does Aetrix verify that LM3414MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3414MR/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 LM3414MR/NOPB meets industry standards.
7.What is the process for return or replacement of LM3414MR/NOPB?
All LM3414MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3414MR/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 LM3414MR/NOPB part is unused and in its original packaging.
Return procedure for LM3414MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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