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Texas Instruments LM3414HVSD/NOPB
- Part No.:
- LM3414HVSD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM3414HVSD/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
LM3414HVSD/NOPB from Texas Instruments is a 1-A, 60-W constant-current buck LED driver with integrated low-side N-channel MOSFET and proprietary Pulse-Level-Modulation (PLM) control. It operates from 4.5 V to 65 V input, delivers ±3% LED current accuracy at 1 A, achieves up to 96% efficiency, and supports common-anode HBLED arrays - used in architectural lighting, MR-16 lamps, and automotive exterior lighting.
For engineers reviewing the LM3414HVSD/NOPB datasheet, LM3414HVSD/NOPB pinout, LM3414HVSD/NOPB application, or LM3414HVSD/NOPB equivalent, key selection considerations include wide-input-voltage operation (4.5–65 V), no external current-sense resistor requirement, adjustable switching frequency (250–1000 kHz), thermal fold-back capability, and WSON-8 package thermal performance (RθJA = 47.7°C/W).
Technical Context
The LM3414HVSD/NOPB implements 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 methods. Its integrated 1.8-Ω N-MOSFET and self-biased 5.4-V VCC regulator enable compact, high-efficiency designs without bootstrapping capacitors or loop compensation networks.
It operates exclusively in continuous conduction mode (CCM) with a 400 ns minimum ON-time constraint, requiring careful inductor selection to maintain regulation across input/output voltage ranges. DIM pin accepts logic-level PWM signals for high-contrast dimming (pulse width <10 µs), while IADJ pin enables analog dimming and thermal fold-back via external resistor biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 65 V DC - supports wide-range industrial and automotive supplies without pre-regulation. |
| Max Output Current | 1 A ±3% - precise constant-current drive for high-power LED strings up to 60 W. |
| Switching Frequency | 250 kHz to 1000 kHz - adjustable via RFS; higher frequencies reduce inductor size but increase switching loss. |
| LED Current Accuracy | ±3% over –40°C to +125°C - ensures consistent luminance across temperature and line variations. |
| Efficiency | Up to 96% - achieved via integrated MOSFET, PLM control, and elimination of external sense resistor losses. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects device and LED load under overload or poor heatsinking conditions. |
| Package | 3 mm × 3 mm WSON-8 with exposed thermal pad - optimized for high-power density and PCB thermal management. |
Pinout & Package
LM3414HVSD/NOPB uses a thermally enhanced 3 mm × 3 mm WSON-8 package with exposed thermal pad (EP) that must be soldered to PGND for effective heat dissipation. The package supports high ambient temperature operation in space-constrained LED driver applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 4.5–65 V DC; connects to input capacitor and high-side of inductor. |
| LX | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode. |
| DIM | PWM dimming input | Logic-level control: >1.2 V enables, <0.9 V disables; supports fast dimming with <10 µs pulses. |
| FS | Frequency setting input | Connects to ground via RFS to set switching frequency from 250–1000 kHz. |
| PGND | Power ground | Reference for power circuitry; must be externally connected to EP and GND. |
| IADJ | Current adjustment input | Biased at 1.255 V; sets LED current via RIADJ (350 mA–1 A range); enables analog dimming/fold-back. |
| GND | Analog ground | Reference for internal analog circuits; must be tied to PGND externally. |
| VCC | Internal regulator output | 5.4-V regulated supply for gate drive and control; bypassed with ≥1 µF ceramic capacitor to GND. |
| EP | Thermal pad | Electrically connected to PGND; critical for thermal performance (RθJC(bot) = 4°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Reduces BOM count, board area, and power loss - enabled by internal PLM-based current sensing. |
| Common-anode LED string support | Enables flexible layout in multi-string architectures where LEDs share anode connections to supply rail. |
| Adjustable constant LED current (350–1000 mA) | Set precisely via single resistor (RIADJ); tolerance ≤0.5% recommended for ±3% accuracy. |
| Integrated low-side N-MOSFET (1.8 Ω RDS(on)) | Eliminates external switch and associated gate-drive complexity; simplifies thermal design with EP pad. |
| Thermal fold-back via IADJ pin | External NTC or voltage source on IADJ reduces LED current as temperature rises - prevents LED thermal runaway. |
| Constant-frequency PWM control | Ensures predictable EMI profile and simplifies filter design; frequency stable over line/load/temperature. |
Applications
| Architectural Lighting | Automotive Exterior Lighting |
|---|---|
|
Use Scenario: Linear LED fixtures for office troffers and retail accent lighting requiring uniform brightness and long life. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1-A drive for 12–18× 3-W HBLEDs in common-anode configuration. Use Value: Delivers 96% efficiency and ±3% current accuracy across 4.5–65 V input, enabling direct connection to 48-V building power without intermediate conversion. |
Use Scenario: Daytime running lights (DRL) and rear combination lamps in 12-V/24-V vehicle systems with transient voltage exposure. IC Role / Device Role / Timing Role: High-voltage tolerant LED driver providing robust 1-A current regulation during cold-crank (4.5 V) and load-dump (65 V) events. Use Value: Withstands automotive transients up to 67 V (500 ms), integrates thermal shutdown (170°C), and supports PWM dimming for adaptive lighting functions. |
| MR-16 LED Replacement Lamps | Industrial High-Bay Lighting |
|
Use Scenario: Retrofit MR-16 halogen lamps with AC/DC drivers powering 6–9× high-brightness LEDs in tight thermal envelopes. IC Role / Device Role / Timing Role: Compact WSON-8 buck driver delivering 1-A current with minimal external components and no sense resistor. Use Value: 3 mm × 3 mm footprint and 47.7°C/W junction-to-ambient thermal resistance enable reliable operation in enclosed lamp housings. |
Use Scenario: High-ceiling warehouse lighting using long LED strings powered from 277-V AC rectified supplies (≈390 V DC bus with PFC). IC Role / Device Role / Timing Role: Pre-regulator stage driving 1-A LED loads from intermediate DC bus; paired with upstream PFC controller. Use Value: Wide 4.5–65 V input range allows use after bulk PFC stage; PLM control maintains accuracy despite input ripple and load step changes. |
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 |
|---|---|---|---|
| LM3414SD/NOPB | Lower max input voltage (4.5–42 V); identical pinout, features, and WSON-8 package. | Suitable for 24-V/36-V industrial or commercial lighting where 65-V rating is unnecessary. | Select LM3414SD/NOPB when input voltage never exceeds 42 V - offers same functionality at lower cost. |
| TPS92691QPWPRQ1 | Automotive-grade AEC-Q100 qualified; includes current-sense amplifier output and enhanced fault reporting. | Required for safety-critical automotive headlamp or fog lamp applications demanding diagnostics and ASIL compliance. | Choose TPS92691QPWPRQ1 only when AEC-Q100 qualification, analog current monitor, or fault flag output is mandatory. |
Compared with LM3414HVSD/NOPB, LM3414SD/NOPB trades 65-V capability for cost reduction in lower-voltage systems, while TPS92691QPWPRQ1 adds automotive qualification and diagnostic features at the expense of higher BOM count and design complexity.
Availability
LM3414HVSD/NOPB is available at Aetrix Electronics and suitable for architectural lighting, automotive exterior lighting, and industrial high-bay lighting requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for LM3414HVSD/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 ICs, with leadership in high-reliability industrial and automotive solutions.
The LM3414HVSD/NOPB belongs to TI's high-voltage LED driver product line, designed specifically for efficient, compact, and thermally robust constant-current driving of high-power HBLED arrays in demanding environments.
FAQ
What is the maximum input voltage rating for LM3414HVSD/NOPB?
The LM3414HVSD/NOPB has an absolute maximum input voltage rating of 67 V for transient conditions (500 ms) and a recommended operating maximum of 65 V DC. This high-voltage tolerance makes it suitable for automotive load-dump scenarios and industrial 48-V systems with margin. Operation above 65 V DC risks permanent damage, and the device will shut down if VCC drops below 3.9 V due to undervoltage lockout.
Does LM3414HVSD/NOPB require an external current-sense resistor?
No, the LM3414HVSD/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 switch current during ON-time only. This eliminates power loss and board space associated with external sense resistors while maintaining ±3% current accuracy across temperature and line variations.
How is LED current adjusted on LM3414HVSD/NOPB?
LED current on the LM3414HVSD/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 mA, with RIADJ in kΩ). For example, 3.13 kΩ sets 1000 mA. TI recommends ≤0.5% tolerance for RIADJ to achieve the specified ±3% accuracy across temperature.
What package type is used for LM3414HVSD/NOPB?
The LM3414HVSD/NOPB is packaged in a 3 mm × 3 mm WSON-8 (NGQ) package with an exposed thermal pad (EP). This thermally enhanced package provides RθJA = 47.7°C/W and RθJC(bot) = 4°C/W, enabling high-power operation in compact layouts. The EP must be soldered to a PGND copper plane for optimal thermal performance and reliability.
Can LM3414HVSD/NOPB support both PWM and analog dimming?
Yes, the LM3414HVSD/NOPB supports both dimming methods: PWM dimming via the DIM pin (logic-level input, min pulse width <10 µs) and analog dimming via the IADJ pin. Applying external bias current to IADJ linearly reduces LED current from 100 mA to 1 A, enabling integration with ambient light or temperature sensors for adaptive lighting control without additional ICs.
LM3414HVSD/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):
- 65V
- 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)
LM3414HVSD/NOPB FAQ
1.How can I place an order for LM3414HVSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3414HVSD/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 LM3414HVSD/NOPB reliable?
The price and inventory of LM3414HVSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3414HVSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM3414HVSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3414HVSD/NOPB transactions.
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4.How is shipping managed for LM3414HVSD/NOPB?
LM3414HVSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3414HVSD/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 LM3414HVSD/NOPB?
For technical support, including LM3414HVSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3414HVSD/NOPB requirements.
6.How does Aetrix verify that LM3414HVSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3414HVSD/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 LM3414HVSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM3414HVSD/NOPB?
All LM3414HVSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3414HVSD/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 LM3414HVSD/NOPB part is unused and in its original packaging.
Return procedure for LM3414HVSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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