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Texas Instruments LM3414SD/NOPB
- Part No.:
- LM3414SD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM3414SD/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
LM3414SD/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 and no external current-sense resistor required. It delivers ±3% LED current accuracy at 1 A, operates from 4.5 V to 42 V input, and achieves up to 96% efficiency in architectural lighting and MR-16 LED lamp applications.
For engineers reviewing the LM3414SD/NOPB datasheet, LM3414SD/NOPB pinout, LM3414SD/NOPB application, or LM3414SD/NOPB equivalent, key selection considerations include its PLM-based average current regulation, 250–1000 kHz adjustable switching frequency, thermal fold-back support via IADJ, analog/PWM dimming capability, and WSON-8 package thermal performance (RθJA = 47.7°C/W).
Technical Context
The LM3414SD/NOPB implements proprietary Pulse-Level-Modulation (PLM) control to regulate true average LED current by sensing internal switch current during ON-time only-enabling high efficiency and eliminating external sense resistors. Its integrated 1.8-Ω N-MOSFET supports up to 1-A continuous output with 400 ns minimum ON-time constraint.
Operation requires continuous conduction mode (CCM); inductor selection must ensure inductor current never reaches zero. The device features internal 5.4-V VCC regulator (bypassed with 1 µF ceramic), thermal shutdown at 170°C, and dual dimming interfaces: logic-level PWM on DIM pin and analog current bias on IADJ pin for ambient/temperature-based dimming.
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 supplies without pre-regulation. |
| Max Output Current | 1 A ±3% - precise constant-current drive for high-power LED strings up to 60 W (e.g., 18×3-W HBLEDs). |
| Switching Frequency | 250–1000 kHz - adjustable via RFS; higher frequencies enable smaller magnetics but require careful EMI layout. |
| LED Current Adjustment | 350 mA to 1000 mA - set by RIADJ resistor (3.13 kΩ for 1 A); enables fine-tuning without recalculating compensation. |
| Efficiency | Up to 96% - achieved via integrated MOSFET and PLM architecture, reducing conduction and sensing losses. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects against sustained overload or poor heatsinking in enclosed fixtures. |
| Dimming Support | PWM (min pulse <10 µs) + analog via IADJ - enables >256-step resolution and smooth thermal fold-back behavior. |
Pinout & Package
LM3414SD/NOPB is housed in a thermally enhanced 3 mm × 3 mm WSON-8 package with exposed thermal pad (EP) that must be soldered to PCB ground plane for optimal thermal performance (RθJB = 22.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal regulator output | Bypass with ≥1 µF ceramic capacitor; powers internal gate drive and control circuits; shuts down if voltage drops below 3.9 V. |
| PGND | Power ground reference | Primary return path for LX switch current; must connect externally to EP and GND pins for low-impedance thermal and current path. |
| IADJ | Analog current adjustment input | Internally biased to 1.255 V; sets LED current via RIADJ to GND; also accepts external bias for analog dimming or thermal fold-back. |
| GND | Analog ground | Reference for internal analog circuitry; must tie externally to PGND to avoid noise coupling into current regulation loop. |
| FS | Frequency setting input | Connect RFS to GND to program switching frequency from 250–1000 kHz; tolerance ±16% at 500 kHz with 40 kΩ resistor. |
| DIM | PWM dimming control | Logic-level input (1.2 V threshold); high enables LED current, low disables switching while keeping VCC active; supports fast slew-up for high-resolution dimming. |
| LX | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode; handles peak currents up to ~3× ILED during overcurrent events. |
| VIN | Main power input | Accepts 4.5–42 V DC; includes UVLO (3.75 V threshold) and transient rating of 45 V (500 ms); decoupled with CIN near package. |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Reduces BOM count and board space; eliminates 1–2 W dissipation typical of 1-A shunt resistors. |
| Pulse-Level-Modulation (PLM) | Enables true average current regulation by sampling internal switch current mid-ramp-no output filter capacitor needed. |
| Adjustable constant-current range | 350–1000 mA via single RIADJ resistor; supports flexible design reuse across LED string configurations. |
| Integrated thermal fold-back | Uses IADJ pin to linearly reduce LED current as temperature rises-prevents thermal runaway without external sensors. |
| High-efficiency buck topology | 96% peak efficiency achieved with integrated 1.8-Ω MOSFET and optimized gate drive-reduces thermal load in compact fixtures. |
Applications
| Architectural Lighting | Office Troffers |
|---|---|
Use Scenario: Linear LED strips mounted in ceiling coves or wall washers requiring uniform brightness and dimming compatibility with 0–10 V or DALI systems. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1-A string of 12–18 high-brightness LEDs per channel; manages analog dimming via IADJ and PWM sync via DIM. Use Value: Eliminates external sense resistor loss and enables compact, thermally efficient driver design suitable for narrow-profile aluminum housings. | Use Scenario: Multi-channel troffer fixtures with independent dimming zones for daylight harvesting and occupancy-based control. IC Role / Device Role / Timing Role: Primary LED current regulator per zone; uses FS pin to set 500 kHz switching for minimal audible noise and small inductors. Use Value: Delivers ±3% current matching across channels and supports >256-step PWM dimming at 240 Hz-meeting IEEE 1789 flicker compliance. |
| Automotive Interior Lighting | MR-16 LED Lamps |
Use Scenario: Dome, map, and courtesy lights powered from 12 V battery with load-dump protection and cold-crank operation down to 4.5 V. IC Role / Device Role / Timing Role: Buck LED driver maintaining stable 350–700 mA output despite input transients; leverages thermal shutdown and fold-back for reliability. Use Value: Withstands 45 V transients (500 ms) and operates down to –40°C; WSON-8 package enables direct mounting to metal-core PCB for passive cooling. | Use Scenario: Retrofit MR-16 lamps replacing halogen bulbs with 12 V AC/DC input and tight thermal constraints inside reflector housing. IC Role / Device Role / Timing Role: High-efficiency (96%) constant-current source driving 3–6 series HBLEDs; uses PLM to maintain regulation without output capacitor. Use Value: Enables full 60 W output in miniature form factor; eliminates electrolytic capacitors for >50,000-hour lifetime at 85°C ambient. |
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 |
|---|---|---|---|
| LM3414MH/NOPB | Same silicon, SOIC-8 package (3.9 × 4.89 mm); higher RθJA = 50.5°C/W; no exposed pad. | Suitable for lower-power designs (<40 W) or legacy SOIC layouts; less effective thermal management in sealed enclosures. | Select LM3414MH/NOPB only when SOIC footprint is mandatory and thermal margin exceeds 25°C. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified; 1.5-A max; integrated diagnostics; I²C interface; 4.5–40 V input. | Targeted at safety-critical automotive exterior lighting; adds fault reporting and programmable protections not present in LM3414SD/NOPB. | Choose TPS92630QPWPRQ1 for ASIL-B systems requiring diagnostics; LM3414SD/NOPB remains optimal for cost-sensitive commercial lighting. |
Compared with LM3414MH/NOPB, LM3414SD/NOPB offers superior thermal performance and smaller footprint; versus TPS92630QPWPRQ1, it provides simpler implementation and lower system cost where automotive qualification is unnecessary.
Availability
LM3414SD/NOPB is available at Aetrix Electronics and suitable for architectural lighting, office troffers, and MR-16 LED lamp designs requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for LM3414SD/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 markets.
The LM3414SD/NOPB belongs to TI's high-efficiency LED driver product line, engineered specifically for cost-sensitive, thermally constrained constant-current lighting applications where simplicity, reliability, and high power density are critical.
FAQ
What is the maximum input voltage rating for LM3414SD/NOPB?
The LM3414SD/NOPB has an absolute maximum input voltage rating of 42 V DC, with a recommended operating range of 4.5 V to 42 V. Transient input voltage up to 45 V is allowed for durations ≤500 ms. Exceeding 42 V continuously risks permanent damage, and operation above 45 V-even briefly-violates absolute maximum ratings.
Does LM3414SD/NOPB require an external current-sense resistor?
No, the LM3414SD/NOPB does not require an external current-sense resistor. It uses integrated current sensing and Pulse-Level-Modulation (PLM) to regulate average LED current directly from the internal switch current waveform. This eliminates power loss and board space associated with external shunts while maintaining ±3% accuracy across temperature.
How is LED current adjusted on LM3414SD/NOPB?
LED current on the LM3414SD/NOPB is adjusted by connecting a precision resistor (RIADJ) between the IADJ pin and GND. The IADJ pin is internally biased to 1.255 V, so ILED ≈ 3125 / RIADJ (in kΩ) mA. For example, a 3.13 kΩ resistor sets nominal 1000 mA output. RIADJ tolerance should be ≤0.5% for full accuracy.
What package type is used for LM3414SD/NOPB?
The LM3414SD/NOPB uses a 3 mm × 3 mm WSON-8 package with an exposed thermal pad (EP). This thermally enhanced package delivers RθJA = 47.7°C/W and RθJB = 22.3°C/W when the EP is properly soldered to a large PCB ground plane-critical for sustaining 1-A continuous operation in compact LED drivers.
Can LM3414SD/NOPB support both PWM and analog dimming simultaneously?
The LM3414SD/NOPB supports either PWM dimming (via DIM pin) or analog dimming (via IADJ pin), but not simultaneous independent control. Applying PWM to DIM enables fast, high-contrast brightness control; biasing IADJ enables slow-varying adjustments like thermal fold-back or ambient light compensation. Using both concurrently may cause unpredictable current regulation due to conflicting control paths.
LM3414SD/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)
LM3414SD/NOPB FAQ
1.How can I place an order for LM3414SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3414SD/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 LM3414SD/NOPB reliable?
The price and inventory of LM3414SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3414SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM3414SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3414SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3414SD/NOPB?
LM3414SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3414SD/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 LM3414SD/NOPB?
For technical support, including LM3414SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3414SD/NOPB requirements.
6.How does Aetrix verify that LM3414SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3414SD/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 LM3414SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM3414SD/NOPB?
All LM3414SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3414SD/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 LM3414SD/NOPB part is unused and in its original packaging.
Return procedure for LM3414SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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