My Inquiry
My Account
Texas Instruments LM3466MRX/NOPB
- Part No.:
- LM3466MRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3466MRX/NOPB.pdf
- Description:
- IC LED DRVR LIN 1.5A 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,091
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3466MRX/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 automatically rebalances current among active strings when one opens - enabling stable brightness in street lamps and solid-state lighting.
For engineers reviewing the LM3466MRX/NOPB datasheet, LM3466MRX/NOPB pinout, LM3466MRX/NOPB application, or LM3466MRX/NOPB equivalent, key selection criteria include its 6–70 V input range, thermal shutdown at 150°C, COMM/VEQ inter-device communication capability, and SO PowerPAD (DDA-8) package with exposed thermal pad for high-power LED string balancing.
Technical Context
The LM3466MRX/NOPB implements a proprietary linear current-balancing architecture where each device regulates its own LED string using feedback from the SEN pin (regulated to 200 mV typical) and controls current through its integrated MOSFET. It requires no communication with the constant-current source - only inter-device coordination via COMM and VEQ pins.
Current ratio between strings is set by individual RSEN values (e.g., 1 Ω yields ~350 mA), with fine-tuning possible via external RSL resistors sourcing ISEN bias current (10.29 µA typ). Thermal protection includes latch-off after 253 consecutive shutdown cycles and automatic recovery at 140°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 70 V - supports wide-range constant-current supplies used in industrial and outdoor LED lighting. |
| LED Current Accuracy | ±1% at 25°C - ensures precise color consistency and luminous output across multiple strings. |
| Integrated MOSFET RDS(on) | 0.5–1.2 Ω - enables low-loss linear regulation up to 1.5 A continuous, minimizing heat generation per channel. |
| SEN Pin Regulation Voltage | 195.6–201.5 mV - sets precise current reference point for external RSEN-based current sensing. |
| Thermal Shutdown Threshold | 150°C (typical) - protects against catastrophic failure during overloads or poor heatsinking. |
| UVLO Threshold | 4.06–5.30 V - prevents erratic startup below minimum operating voltage, ensuring clean system initialization. |
| Operating Junction Temp | −40°C to +125°C - qualified for harsh environments including street lighting and industrial enclosures. |
Pinout & Package
LM3466MRX/NOPB uses the SO PowerPAD (DDA-8) package with an exposed thermal pad connected internally to GND, requiring PCB copper area ≥60 cm² (2 oz/Cu) for full 1.5-A operation at 125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILED | Current regulator output | Connects to LED string cathode; carries full LED current through integrated MOSFET drain. |
| VIN | Power supply input | Accepts 6–70 V DC; decoupled with 10-nF ceramic capacitor to ground for stability. |
| SEN | Current sense feedback | Regulated to 200 mV; senses voltage across RSEN to control MOSFET conduction. |
| SRC | MOSFET source terminal | Connects to RSEN; forms current-sense node with SEN pin and internal bias current. |
| VEQ | Inter-device equalization | Connected via 51.1-Ω resistor + 1-µF capacitor to other LM3466 VEQ pins for synchronized balancing. |
| COMM | Status & communication | Open-drain output indicating startup, active/inactive state, or thermal fault; wired in parallel across all devices. |
| GND | Ground reference | Common return for analog and power circuits; tied to exposed thermal pad. |
| NC | No connect | Pin 8 is not internally connected - must remain unconnected per TI design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic current rebalancing | When one LED string opens, remaining strings increase current proportionally to maintain total output power and system brightness. |
| Modular string expansion | Add new LED strings with only one LM3466MRX/NOPB, one RSEN resistor, and one CLED capacitor - no redesign of core supply required. |
| ±1% current matching | Enables consistent lumen output and color temperature across strings without trimming or calibration. |
| EMI-friendly linear operation | No switching noise generated - eliminates need for EMI filters when paired with compliant constant-current supplies. |
| Fault reporting via COMM pin | Single-wire status signaling (low = thermal shutdown or startup; high = normal active operation) simplifies system-level monitoring. |
Applications
| Street Lighting | Architectural LED Facades |
|---|---|
Use Scenario: Outdoor LED street lamp with 4–6 parallel strings driven by a single 1.75-A constant-current supply. IC Role / Device Role / Timing Role: LM3466MRX/NOPB acts as per-string current balancer, maintaining uniform brightness despite varying forward voltages across aged or temperature-shifted LED strings. Use Value: Prevents visible dimming or flicker if one string fails open, preserving safety-critical illumination levels without controller intervention. | Use Scenario: High-bay commercial lighting with RGBW LED modules requiring independent current tuning per color channel. IC Role / Device Role / Timing Role: LM3466MRX/NOPB serves as tunable current regulator per channel, using RSL resistors to adjust ILED for precise white-point and CRI control. Use Value: Enables factory-set color temperature compensation without microcontroller firmware changes or additional DACs. |
| Industrial Machine Vision Lights | Emergency Exit Signage |
Use Scenario: High-intensity strobed LED array for inspection systems, powered by constant-current drivers with tight thermal constraints. IC Role / Device Role / Timing Role: LM3466MRX/NOPB provides low-noise linear regulation with thermal latch-off protection to prevent overheating during extended duty cycles. Use Value: Eliminates switching artifacts that could interfere with camera synchronization while ensuring fail-safe thermal shutdown. | Use Scenario: UL924-compliant emergency egress signage with redundant LED strings for reliability certification. IC Role / Device Role / Timing Role: LM3466MRX/NOPB balances current across dual strings and reports fault status via COMM pin to building management system. Use Value: Meets NFPA 101 requirement for automatic brightness maintenance during single-string failure without manual reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current balancing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3466TA/NOPB | TO-220-7 package; higher thermal mass; no exposed pad; 32.2°C/W θJA vs. 50.7°C/W for DDA-8. | Better suited for lower-density layouts with forced-air cooling; less compact than SO PowerPAD. | Select LM3466TA/NOPB when board space allows larger footprint and passive heatsinking suffices. |
| AL8862T-13 | Switching buck-boost LED driver; requires inductor; supports 4–40 V input; no inter-device balancing bus. | Not drop-in compatible; lacks VEQ/COMM architecture for multi-string coordination. | Choose AL8862T-13 only when efficiency >85% is mandatory and system-level current sharing can be handled externally. |
Compared with LM3466TA/NOPB, LM3466MRX/NOPB offers superior thermal performance per unit area due to its exposed pad, while AL8862T-13 trades linear simplicity for higher efficiency but forfeits native multi-string balancing - making LM3466MRX/NOPB the optimal choice for compact, EMI-sensitive, modular LED systems requiring guaranteed current matching.
Availability
LM3466MRX/NOPB is available at Aetrix Electronics and suitable for street lighting, architectural LED facades, industrial machine vision lights, and emergency exit signage requiring stable component supply across long-lifecycle deployments.
Supply support for LM3466MRX/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 modular, high-reliability LED lighting systems powered by constant-current sources - prioritizing current accuracy, thermal robustness, and seamless multi-string scalability without digital control overhead.
FAQ
What is the maximum number of LM3466MRX/NOPB devices that can be interconnected in a single LED lighting system?
TI does not specify a hard upper limit on LM3466MRX/NOPB count per system. Practical constraints arise from VEQ network impedance and COMM pin drive strength: with 51.1-Ω series resistors and 1-µF capacitors, systems with up to 12 devices have been validated in reference designs. Larger arrays require verification of VEQ settling time and COMM logic levels under worst-case trace capacitance and leakage.
Does LM3466MRX/NOPB support PWM dimming, and how is it implemented?
LM3466MRX/NOPB does not integrate native PWM dimming control. Dimming is achieved externally by modulating the constant-current supply's output or by pulsing the VIN pin - though the latter requires careful timing to avoid UVLO triggering. For true PWM, TI recommends pairing LM3466MRX/NOPB with a separate gate driver controlling the supply's enable signal, preserving current balance during on/off transitions.
Can LM3466MRX/NOPB operate with LED string forward voltages exceeding 70 V?
No - the absolute maximum rating for ILED-to-GND is 75 V, and recommended operation caps at 70 V. For strings >70 V, TI specifies use of an external high-voltage MOSFET controlled by the LM3466MRX/NOPB's SRC/SEN signals, with RLED (1 MΩ) added from ILED to GND to protect against leakage-induced overvoltage.
What is the function of the NC pin (Pin 8) on the LM3466MRX/NOPB DDA-8 package?
Pin 8 of the LM3466MRX/NOPB is designated No Connect (NC) and is not bonded internally. TI's datasheet and package outline explicitly prohibit connection to this pin. Leaving it floating ensures correct thermal pad grounding and avoids unintended parasitic coupling that could destabilize the SEN feedback loop.
How does LM3466MRX/NOPB handle thermal derating, and what PCB layout practices maximize its current capability?
LM3466MRX/NOPB requires thermal derating above 100°C ambient: at 125°C, max continuous current drops to 1 A with 60 cm² of 2 oz/Cu ground plane. To maximize current, use ≥6 vias (0.3 mm diameter) under the exposed thermal pad, extend copper area beyond the package outline, and avoid solder mask over thermal pads - all per TI's Layout Guidelines in SNOSB96F.
LM3466MRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM3466MRX/NOPB FAQ
1.How can I place an order for LM3466MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3466MRX/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 LM3466MRX/NOPB reliable?
The price and inventory of LM3466MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3466MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3466MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3466MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3466MRX/NOPB?
LM3466MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3466MRX/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 LM3466MRX/NOPB?
For technical support, including LM3466MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3466MRX/NOPB requirements.
6.How does Aetrix verify that LM3466MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3466MRX/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 LM3466MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3466MRX/NOPB?
All LM3466MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3466MRX/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 LM3466MRX/NOPB part is unused and in its original packaging.
Return procedure for LM3466MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3466MRX/NOPB Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
