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Texas Instruments LM3466TA/NOPB
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- Part No.:
- LM3466TA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- TO-220-7
- Datasheet:
-
LM3466TA/NOPB.pdf
- Description:
- IC LED DRVR LINEAR 1.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
LM3466TA/NOPB from Texas Instruments is a linear multi-string LED current balancer IC designed for constant-current power supply systems. It integrates a 70-V, 1.5-A N-channel MOSFET with 2.06-A current limit, regulates LED string current via external sense resistor (RSEN), maintains ±1% current accuracy at room temperature, and supports up to 70-V per string in street lighting and solid-state lighting systems.
For engineers reviewing the LM3466TA/NOPB datasheet, LM3466TA/NOPB pinout, LM3466TA/NOPB application, or LM3466TA/NOPB equivalent, key selection criteria include its thermal shutdown threshold (150°C), VSEN regulation voltage (200 mV), COMM pin fault reporting, and compatibility with modular multi-string architectures requiring automatic current redistribution upon string failure.
Technical Context
The LM3466TA/NOPB implements a linear current regulator architecture that senses voltage across an external RSEN resistor via the SEN pin and controls its integrated MOSFET to maintain precise ILED. Its proprietary inter-device communication via VEQ and COMM pins enables synchronized current balancing across multiple strings without digital interface or host controller.
Each device operates independently but cooperatively: VEQ pin voltage (set by 51.1-Ω/1-µF network) establishes reference for current ratio tuning, while COMM pin status indicates startup, thermal shutdown, or string inactive state. The TO-220-7 package provides low θJCbot (0.3°C/W) for high-power dissipation in thermally constrained lighting fixtures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 70 V - supports wide-input constant-current supplies used in industrial and outdoor LED drivers. |
| VSEN Regulation | 200 mV ±1.5 mV - sets precise current via ILED = VSEN / RSEN, enabling accurate string-to-string matching. |
| Current Limit | 2.06 A - protects internal MOSFET during overcurrent or short-circuit conditions without external circuitry. |
| Thermal Shutdown | 150°C - disables output and pulls COMM low to signal fault, preventing catastrophic failure in enclosed luminaires. |
| UVLO Threshold | 4.78 V (rising) with 0.52 V hysteresis - ensures clean startup only when input rail is stable above minimum operating voltage. |
| ISEN Bias Current | 10.29 µA - enables fine-tuning of LED current using external RSL resistors for color temperature or CRI adjustment. |
| RDS(on) | 1.2 Ω max - defines conduction loss and thermal rise under full load; critical for efficiency and heatsink sizing in TO-220 layout. |
Pinout & Package
LM3466TA/NOPB uses the NEC (TO-220-7) package with exposed tab thermally connected to GND. The 7-pin through-hole configuration supports high-current operation and direct PCB heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILED (Pin 5) | LED string cathode connection | Carries full LED string current; requires low-inductance path and optional CLED capacitor for EMI suppression on long cables. |
| VIN (Pin 7) | Main supply input | Accepts 6–70 V constant-current source; decoupled with 10-nF ceramic capacitor to stabilize regulation loop. |
| SEN (Pin 2) | Current sense feedback | Regulated to 200 mV; connects to RSEN node to close current control loop with ±1% accuracy at 25°C. |
| SRC (Pin 3) | MOSFET source terminal | Connects directly to RSEN; forms Kelvin sense path to minimize PCB trace resistance error in high-precision applications. |
| VEQ (Pin 1) | Inter-device balance reference | Shares common RC network (51.1 Ω + 1 µF) across all LM3466 devices to synchronize current ratios in multi-string systems. |
| COMM (Pin 6) | Fault/status open-drain output | Pulled low during thermal shutdown or startup; used for system-level fault detection and string activity monitoring. |
| GND (Pin 4) | Power and signal ground | Common return for MOSFET, sense circuitry, and thermal pad; must be low-impedance plane for stability and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 70-V, 1.5-A MOSFET | Eliminates external pass transistor and associated gate drive complexity in linear LED balancer designs. |
| ±1% current accuracy at 25°C | Enables tight binning control for consistent lumen output and color point across multiple LED strings. |
| Automatic current redistribution | Maintains total system power within ±5% when one or more LED strings open, preserving perceived brightness. |
| Linear-only architecture | Generates zero switching noise-critical for EMI-sensitive environments like medical or RF-co-located lighting. |
| Thermal latch-off after 253 cycles | Prevents repeated thermal cycling damage by forcing power reset after sustained overheating events. |
Applications
| Street Lighting | Commercial Indoor Lighting |
|---|---|
Use Scenario: Outdoor LED luminaire with 4–6 parallel strings driving high-power white LEDs for roadway illumination. IC Role / Device Role / Timing Role: Linear current balancer that redistributes 1.75-A supply current among active strings when individual strings fail due to moisture ingress or thermal stress. Use Value: Maintains >95% of original lumen output after single-string open-circuit failure, extending maintenance intervals and reducing energy waste. | Use Scenario: Office troffer with tunable-white LED arrays requiring independent current control per warm/cool channel. IC Role / Device Role / Timing Role: Precision current regulator enabling fine-tuned RSL resistor adjustment to match CCT and CRI targets across color channels. Use Value: Achieves ±100K CCT tolerance and >90 CRI without closed-loop optical feedback, lowering BOM cost vs. digital solutions. |
| Industrial High-Bay Lighting | Architectural Facade Lighting |
Use Scenario: Warehouse high-bay fixture with 8–12 LED strings operating from 48-V constant-current driver in high-ambient-temperature environments. IC Role / Device Role / Timing Role: Thermally robust balancer leveraging TO-220-7 package's 0.3°C/W θJCbot to sustain 1.2-A continuous current at 100°C ambient. Use Value: Enables derated operation without forced air cooling, reducing system noise and increasing reliability in dust-prone facilities. | Use Scenario: Dynamic RGBW facade module where individual string currents must scale synchronously during dimming sequences. IC Role / Device Role / Timing Role: Synchronized balancer using shared VEQ network to ensure proportional current scaling across color channels during analog/PWM dimming. Use Value: Prevents hue shift during dimming by maintaining fixed current ratios independent of supply voltage variation or thermal drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current balancing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3466MR/NOPB | SO PowerPAD (DDA-8) package; higher θJA (50.7°C/W); 10.5 µA ISEN bias current. | Better suited for space-constrained PCB layouts; lower thermal mass limits peak current to 1.0 A at 125°C ambient. | Select LM3466MR/NOPB for compact, surface-mount designs where board area is limited and thermal management uses copper pour instead of heatsinks. |
| AL8862T-13 | Switching buck-boost LED driver; no inter-device balancing; requires MCU for string coordination. | Higher efficiency (>92%) but introduces EMI; lacks automatic redistribution on string failure. | Choose AL8862T-13 only when system-level efficiency >88% is mandatory and fault-tolerant brightness is managed externally. |
Compared with LM3466MR/NOPB, LM3466TA/NOPB delivers superior thermal performance in high-power fixtures via TO-220 mounting and heatsink integration, while AL8862T-13 trades off fault resilience and EMI simplicity for efficiency-making LM3466TA/NOPB optimal for reliability-critical outdoor and industrial lighting.
Availability
LM3466TA/NOPB is available at Aetrix Electronics and suitable for street lamps, commercial indoor lighting, industrial high-bay fixtures, and architectural facade lighting requiring stable component supply and long-term production continuity.
Supply support for LM3466TA/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 technologies with over 50 years of innovation in industrial and automotive electronics.
The LM3466 product line was developed specifically for high-reliability, multi-string LED lighting systems powered by constant-current sources, emphasizing fault tolerance, thermal robustness, and EMI-free operation in harsh environments.
FAQ
What is the maximum LED string voltage supported by LM3466TA/NOPB?
The LM3466TA/NOPB supports up to 70 V per LED string, as defined by its absolute maximum VIN rating of 75 V and recommended 6–70 V operating range. This allows driving up to 20 standard white LEDs (3.5 V VF each) in series. Exceeding 70 V requires external high-voltage MOSFET circuits per TI application note SNOSB96F Figure 16.
How does LM3466TA/NOPB handle an open LED string during operation?
When an LED string opens, LM3466TA/NOPB detects the fault via VEQ pin cycling and confirms inactivity after 253 consecutive cycles. It then automatically redistributes the constant-current supply among remaining active strings, maintaining total output power and system brightness. The COMM pin pulls low during thermal shutdown but remains high/low to indicate active/inactive status otherwise.
Can LM3466TA/NOPB be used with AC-DC constant-current power supplies?
Yes, LM3466TA/NOPB is explicitly designed to work with both AC-DC and DC-DC constant-current power supplies, as stated in its datasheet features. No communication or feedback to the supply is required-only proper input voltage conditioning (e.g., 10-nF CIN capacitor) and adherence to the 6–70 V VIN range.
What is the purpose of the VEQ pin on LM3466TA/NOPB?
The VEQ pin on LM3466TA/NOPB serves as the inter-device balance reference node. All LM3466 devices in a system share a common RC network (51.1 Ω + 1 µF to ground) connected to their VEQ pins, ensuring synchronized current ratio setting and stable redistribution behavior across strings regardless of forward voltage mismatch.
Does LM3466TA/NOPB require external components for basic operation?
Yes, LM3466TA/NOPB requires three external components for basic operation: an RSEN sense resistor (sets ILED = 200 mV / RSEN), a 10-nF CIN capacitor from VIN to GND (input decoupling), and a shared REQ/CEQ network (51.1 Ω + 1 µF) connecting all VEQ pins. Additional CLED may be added for noise suppression on long LED cables.
LM3466TA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-7
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 70V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A (Switch)
- Frequency:
- -
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM3466TA/NOPB FAQ
1.How can I place an order for LM3466TA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3466TA/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 LM3466TA/NOPB reliable?
The price and inventory of LM3466TA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3466TA/NOPB is usually 5 days.
3.What payment methods are accepted for LM3466TA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3466TA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3466TA/NOPB?
LM3466TA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3466TA/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 LM3466TA/NOPB?
For technical support, including LM3466TA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3466TA/NOPB requirements.
6.How does Aetrix verify that LM3466TA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3466TA/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 LM3466TA/NOPB meets industry standards.
7.What is the process for return or replacement of LM3466TA/NOPB?
All LM3466TA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3466TA/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 LM3466TA/NOPB part is unused and in its original packaging.
Return procedure for LM3466TA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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