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Texas Instruments LM3414SDX/NOPB
- Part No.:
- LM3414SDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM3414SDX/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3414SDX/NOPB from Texas Instruments is a 1-A, 60-W constant-current buck LED driver with integrated low-side N-channel MOSFET and Pulse-Level-Modulation (PLM) control. It delivers ±3% LED current accuracy over –40°C to 125°C, operates from 4.5 V to 42 V input, and supports common-anode HBLED arrays up to 18×3 W in architectural lighting systems.
For engineers reviewing the LM3414SDX/NOPB datasheet, LM3414SDX/NOPB pinout, LM3414SDX/NOPB application, or LM3414SDX/NOPB equivalent, key selection criteria include its no-external-sense-resistor architecture, adjustable 350–1000 mA output current via IADJ resistor, 250–1000 kHz programmable switching frequency, thermal fold-back capability, and WSON-8 package with exposed thermal pad for high-power LED thermal management.
Technical Context
The LM3414SDX/NOPB implements proprietary PLM control to regulate average LED current by sensing internal switch current during ON-time only-eliminating external sense resistors and reducing power loss versus conventional sensing. Its 400 ns minimum ON-time and CCM-only operation require careful inductor selection to maintain regulation across input/output voltage ranges.
It integrates a 5.4-V internal VCC regulator (bypassed with 1 µF ceramic), thermal shutdown at 170°C with 10°C hysteresis, and dual dimming interfaces: logic-level PWM on DIM pin (with 1.2 V threshold and 100 mV hysteresis) and analog dimming via IADJ bias current. The device lacks external loop compensation and supports common-anode configurations without floating ground constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Adjustable 350–1000 mA average LED current with ±3% accuracy over temperature and line; set by RIADJ resistor to GND. |
| Input Voltage Range | 4.5 V to 42 V DC - supports wide-range industrial and automotive LED power supplies without pre-regulation. |
| Switching Frequency | 250–1000 kHz - externally set via RFS to GND; enables EMI optimization and compact magnetics selection. |
| Current Sensing | No external resistor required - internal PLM-based sensing reduces BOM count and improves efficiency vs. shunt-based designs. |
| Efficiency | Up to 96% - achieved via integrated 1.8 Ω low-side MOSFET, minimal gate drive losses, and optimized PLM control. |
| Thermal Protection | 170°C shutdown with 10°C hysteresis - protects against sustained overload or poor heatsinking in enclosed luminaires. |
| Dimming Interface | PWM dimming with <10 µs minimum pulse width; analog dimming supported via IADJ pin bias current (100–1000 mA range). |
Pinout & Package
LM3414SDX/NOPB uses a 3 mm × 3 mm WSON-8 package with exposed thermal pad (EP) that must be soldered to PGND for thermal and electrical integrity. Pin numbering follows top-view standard: Pin 1 = VCC, Pin 2 = PGND, Pin 3 = IADJ, Pin 4 = GND, Pin 5 = FS, Pin 6 = DIM, Pin 7 = LX, Pin 8 = VIN, EP = thermal/power ground.
| 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 in buck topology. |
| DIM (Pin 6) | PWM dimming input | Logic-level control: >1.2 V enables LED current, <0.9 V disables switching while maintaining VCC regulation. |
| FS (Pin 5) | Frequency setting input | Connects to RFS resistor to GND; sets switching frequency from 250–1000 kHz per fSW = 20 MHz / RFS. |
| PGND (Pin 2) | Power ground | Reference for high-current paths (LX, VIN); must be tied to EP and system GND with low-inductance connection. |
| IADJ (Pin 3) | Current adjustment input | 1.255 V reference node; RIADJ to GND sets LED current as ILED = 3125 / RIADJ (kΩ) mA. |
| GND (Pin 4) | Analog ground | Reference for internal analog circuitry; must be connected externally to PGND (star point preferred). |
| VCC (Pin 1) | Internal regulator output | 5.4 V regulated supply for gate drive and control; requires 1 µF ceramic bypass to GND near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-Level-Modulation (PLM) control | Enables true average current regulation without external sense resistor by sampling internal switch current only during ON-time - cuts sensing losses by ~50% vs. continuous shunt sensing. |
| Integrated low-side N-MOSFET | 1.8 Ω RDS(on) MOSFET eliminates external switch and bootstrapping components - simplifies layout and reduces component count. |
| Common-anode LED support | Enables direct drive of multi-string LED arrays where all anodes share a common rail - ideal for MR-16 and troffer retrofit modules. |
| Thermal fold-back via IADJ | External thermistor or sensor can bias IADJ to reduce LED current linearly above threshold temperature - prevents thermal runaway without added ICs. |
| High-contrast PWM dimming | Supports >256-step resolution at 240 Hz with <10 µs minimum dimming pulse - meets flicker-sensitive architectural and office lighting standards. |
Applications
| Architectural Lighting | Office Troffers |
|---|---|
|
Use Scenario: Linear LED modules mounted in suspended ceiling grids with 0–10 V or DALI-controlled dimming. IC Role / Device Role / Timing Role: Constant-current buck driver regulating 700 mA through 12×3 W common-anode LEDs; handles 27–42 V input from centralized 48 V DC bus. Use Value: Eliminates external current sense resistor and compensation network - reduces board area by 35% and improves thermal margin in confined plenum spaces. |
Use Scenario: Retrofit LED troffer using existing AC wiring with external DC-DC converter feeding 36 V bus. IC Role / Device Role / Timing Role: Primary LED current controller delivering 1 A to 6×3 W LEDs; accepts PWM signal from occupancy sensor for step-dimming. Use Value: 96% peak efficiency minimizes heat generation inside sealed troffer housing - extends LED lifetime and avoids derating at 60°C ambient. |
| Automotive Exterior Lighting | MR-16 LED Lamps |
|
Use Scenario: Daytime running light (DRL) module powered from 12 V vehicle battery with load dump protection. IC Role / Device Role / Timing Role: Buck LED driver operating from 9–16 V input; provides stable 350 mA to 4×3 W LEDs with thermal fold-back during engine bay hot soak. Use Value: Wide 4.5–42 V input range accommodates cold-crank (6.5 V) and load-dump (42 V) transients without external TVS - lowers system BOM cost. |
Use Scenario: GU5.3 base MR-16 lamp replacing halogen with 12 V AC/DC input and analog dimming via trailing-edge dimmer. IC Role / Device Role / Timing Role: Constant-current source driving single 1 A string; IADJ pin biased by rectified dimmer waveform for smooth analog dimming. Use Value: No external sense resistor allows full use of limited PCB real estate in compact MR-16 envelope - enables 100% lumen retention at 2700 K CCT. |
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 |
|---|---|---|---|
| LM3414MHX/NOPB | Same silicon, SOIC-8 package (3.9 mm × 4.89 mm); higher RθJA (50.5°C/W vs. 47.7°C/W) limits max ambient in sealed enclosures. | Preferred where manual assembly or legacy SOIC footprint is required; less suitable for high-density LED modules. | Select LM3414MHX/NOPB only when board rework or hand-soldering is needed; otherwise LM3414SDX/NOPB offers superior thermal performance. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified; includes integrated current mirror for multi-string current matching; 3.3–40 V input; 1.5 A max. | Required for ASIL-B lighting systems; supports independent dimming of up to 3 LED strings with matched current (<±1.5%). | Choose TPS92630QPWPRQ1 for automotive safety-critical headlamp or DRL applications; LM3414SDX/NOPB remains optimal for commercial lighting cost targets. |
Compared with LM3414MHX/NOPB, LM3414SDX/NOPB delivers lower thermal resistance and smaller footprint for space-constrained luminaires; versus TPS92630QPWPRQ1, it offers lower system cost and simpler design but lacks automotive qualification and multi-string capability.
Availability
LM3414SDX/NOPB is available at Aetrix Electronics and suitable for architectural lighting, office troffers, and MR-16 LED lamps requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for LM3414SDX/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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in LED driver innovation and high-reliability power conversion.
The LM3414 product line was designed specifically for high-efficiency, high-power LED lighting systems requiring precise constant-current regulation, minimal external components, and robust thermal management in commercial and industrial environments.
FAQ
What is the maximum LED string voltage supported by LM3414SDX/NOPB?
The LM3414SDX/NOPB does not specify a maximum LED string voltage directly; instead, it requires the input voltage to exceed the LED forward voltage by sufficient margin to sustain regulation. With 42 V max input and typical 1 A operation, it supports up to ~36 V LED string voltage (e.g., 12×3 W LEDs at 3 V each) while maintaining CCM and 400 ns minimum ON-time. Always verify inductor selection and duty cycle per Equation 10 in the datasheet for your specific VLED and VIN.
Can LM3414SDX/NOPB drive multiple parallel LED strings?
LM3414SDX/NOPB is designed for single-string constant-current operation and does not provide current matching between parallel strings. Driving multiple parallel strings without individual regulation risks current imbalance and premature LED failure. For multi-string applications, use separate LM3414SDX/NOPB channels or select a multi-channel driver like TPS92630QPWPRQ1. The device's common-anode capability applies only to series-connected LEDs sharing one anode node.
How is thermal performance affected by the exposed pad (EP) connection on LM3414SDX/NOPB?
The exposed thermal pad (EP) on LM3414SDX/NOPB must be soldered to a dedicated PGND copper pour with ≥4 thermal vias to internal ground planes. Per datasheet RθJB = 22.3°C/W, improper EP connection increases junction-to-board resistance, raising die temperature by up to 15°C at 1 A load - potentially triggering thermal shutdown or reducing LED lifetime. TI recommends 200–300 µm solder paste stencil thickness and full pad coverage for reliable thermal transfer.
Does LM3414SDX/NOPB require external compensation components?
No, LM3414SDX/NOPB requires no external loop compensation components. Its proprietary PLM control architecture and integrated current sensing eliminate the need for traditional Type II or III compensation networks. This simplifies design, reduces bill-of-materials, and improves stability across input/output voltage and load variations - confirmed in Section 7.1 and Figure 14 of SNVS678F.
What is the minimum recommended RIADJ resistor value for LM3414SDX/NOPB?
The minimum recommended RIADJ resistor value is 3.13 kΩ, which sets the maximum rated LED current of 1000 mA (per ILED = 3125 / RIADJ(kΩ) mA). Using a lower value (e.g., 2.5 kΩ) forces the device into overcurrent protection - cycling the internal switch OFF for 3.6 µs repeatedly - causing instability and potential damage. Always use ≤0.5% tolerance metal-film resistors for accurate current setting, as shown in Table 2 of the datasheet.
LM3414SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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-WSON (3x3)
LM3414SDX/NOPB FAQ
1.How can I place an order for LM3414SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3414SDX/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 LM3414SDX/NOPB reliable?
The price and inventory of LM3414SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3414SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3414SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3414SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3414SDX/NOPB?
LM3414SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3414SDX/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 LM3414SDX/NOPB?
For technical support, including LM3414SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3414SDX/NOPB requirements.
6.How does Aetrix verify that LM3414SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3414SDX/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 LM3414SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3414SDX/NOPB?
All LM3414SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3414SDX/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 LM3414SDX/NOPB part is unused and in its original packaging.
Return procedure for LM3414SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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