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Texas Instruments LM3464MHX/NOPB
- Part No.:
- LM3464MHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3464MHX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM3464MHX/NOPB from Texas Instruments is a 4-channel linear LED current regulator IC for high-voltage lighting systems, supporting 12V–80V input, delivering ±3% channel-to-channel current accuracy, enabling dynamic headroom control (DHC) via OutP pin, and integrating thermal foldback dimming with NTC sensor interface - used in streetlight drivers where precise per-string current regulation and system-level efficiency optimization are critical.
For engineers reviewing the LM3464MHX/NOPB datasheet, LM3464MHX/NOPB pinout, LM3464MHX/NOPB application, or LM3464MHX/NOPB equivalent, key selection considerations include DHC loop response tuning via CDHC capacitor, VDHC biasing for ripple margining, thermal dimming frequency set by CTHM, and fault detection thresholds on DRx/SEx pins for open/short LED string protection.
Technical Context
The LM3464MHX/NOPB implements four independent linear current regulators using external N-channel MOSFETs, each controlled by a 200 mV reference amplifier comparing SEx voltage to drive GDx gate outputs. Its Dynamic Headroom Control operates as a slow-loop feedback system: DRx voltage deviations from 0.9 V (VDHC default) modulate CDHC charging current, which integrates to adjust OutP sink current and thereby regulate primary supply rail voltage (VRAIL) dynamically.
Thermal foldback uses a sawtooth generator at Thermal_Cap pin (50 µA charge / 125 Ω discharge) to produce PWM dimming synchronized to analog voltage on Thermal pin; minimum duty cycle is programmable via DMIN pin voltage, and fault signaling occurs through open-drain Faultb output with configurable delay via FAULT_CAP capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 12 V to 80 V - supports wide-range industrial AC/DC supplies without pre-regulation |
| LED Current Accuracy | ±3% channel-to-channel - ensures uniform brightness across multi-string LED arrays |
| DHC Reference Voltage | 0.9 V typical at VDHC pin - sets minimum MOSFET drain-source voltage headroom for efficiency optimization |
| Thermal Dimming Frequency | Programmable via CTHM capacitor - defines sawtooth ramp rate for analog-controlled PWM dimming |
| Fault Response Delay | Configurable via FAULT_CAP capacitor - allows adjustable blanking time before Faultb assertion |
| Gate Driver Output | 4.73 V max, 0.127 V min at GDx - sufficient to fully enhance standard logic-level N-MOSFETs |
| Junction Temp Range | −40°C to +125°C - qualified for outdoor lighting environments with extended thermal cycling |
Pinout & Package
LM3464MHX/NOPB is housed in a thermally enhanced TSSOP-28 package (PWP) with exposed power pad (EP) electrically tied to PGND for low-θJA (33.5°C/W) and robust thermal dissipation in high-power LED driver PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DR1–DR4 | Drain voltage sense inputs | Monitor external MOSFET drain voltage to detect overvoltage (>19 V) and enable DHC loop correction |
| GD1–GD4 | Gate driver outputs | Drive gates of external N-MOSFETs; 8 mA short-circuit current capability ensures fast switching |
| SE1–SE4 | Current sense inputs | Connect to sense resistors; internal 200 mV reference enables precise LED current setting (ILED = 200 mV / RSENSE) |
| OutP | DHC output | Current-sinking output interfaced to primary supply feedback node to dynamically lower VRAIL and minimize MOSFET losses |
| VLedFB | Voltage feedback input | Senses primary supply output voltage; triggers DHC startup when voltage reaches 2.5 V threshold |
| Thermal / Thermal_Cap | Analog thermal interface | Thermal pin accepts 0–VCC DC voltage for analog dimming; Thermal_Cap sets thermal foldback PWM frequency |
| Faultb / FAULT_CAP | Fault signaling & timing | Faultb is open-drain fault flag; FAULT_CAP capacitor programs fault detection delay time |
| VIN / VCC / EN / AGND / PGND | Power & control | VIN powers device (12–80 V); VCC is internal 6.3 V regulator output; EN enables device (active-high, internal pull-up) |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Reduces primary supply voltage to minimum required for regulation - cuts MOSFET conduction loss and improves total system efficiency up to 15% in high-string-count designs |
| Four Independent Linear Regulators | Enables per-string current matching without shared components - eliminates current imbalance due to forward voltage mismatch across LED strings |
| Integrated Thermal Foldback | Uses NTC thermistor input to automatically reduce LED current above 125°C - extends LED lifetime and prevents thermal runaway without external microcontroller |
| Dual Dimming Interface | Accepts either logic-level PWM on DIM pin or analog voltage on Thermal pin - supports both digital control and passive thermal/ambient light adaptation |
| Comprehensive Fault Protection | Detects LED open/short, overtemperature (165°C shutdown), VIN UVLO (8.5 V), and DRx overvoltage - asserts open-drain Faultb signal for system-level error handling |
Applications
| Street Lighting Systems | Industrial High-Bay Fixtures |
|---|---|
|
Use Scenario: Outdoor LED streetlights operating continuously under variable ambient temperature and grid voltage fluctuations. IC Role / Device Role / Timing Role: Four-channel linear current regulator managing parallel LED strings while coordinating with flyback AC/DC supply via DHC to maintain efficiency across load and temperature. Use Value: DHC reduces average rail voltage by 8–12 V under thermal steady state, cutting MOSFET power loss by >30% versus fixed-rail designs. |
Use Scenario: Warehouse high-bay luminaires with 12–24 high-power LEDs per fixture, requiring uniform lumen output and thermal derating. IC Role / Device Role / Timing Role: Thermal foldback controller using NTC sensor on heatsink to scale LED current from 100% to <1% based on real-time temperature rise. Use Value: Prevents LED junction temperature exceeding 135°C, extending L70 lifetime from 35k to >50k hours in enclosed fixtures. |
| Architectural Facade Lighting | Municipal Tunnel Lighting |
|
Use Scenario: Color-consistent RGBW LED arrays mounted on building façades, subject to solar heating and long cable runs. IC Role / Device Role / Timing Role: Precision current regulator with ±3% channel matching ensuring identical brightness across red/green/blue channels despite Vf drift. Use Value: Eliminates visible color shift during thermal soak by maintaining per-string current within 10 mA tolerance at 350 mA nominal. |
Use Scenario: 24/7 tunnel lighting with strict reliability requirements and remote fault monitoring via SCADA. IC Role / Device Role / Timing Role: Fault manager asserting open-drain Faultb signal upon LED open/short detection, with FAULT_CAP-tuned delay to suppress false triggers from transient surges. Use Value: Enables predictive maintenance by logging fault events without nuisance tripping during lightning-induced line transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3464AMHX/NOPB | Extended input range (12–95 V) and same pinout; otherwise identical functionality and register mapping | Required for 90 VAC-derived supplies or long-cable-drop installations where input may exceed 80 V | Select LM3464AMHX/NOPB when VIN can reach 95 V; LM3464MHX/NOPB is optimal for 48–72 VDC systems with tighter cost targets |
| LT3761EFE#PBF | Switching LED controller (boost/buck-boost) vs. linear topology; higher efficiency at >1 A/channel but requires inductor and generates EMI | Suitable for battery-powered or ultra-high-efficiency designs where thermal management is constrained | Choose LT3761EFE#PBF only if system-level efficiency >92% is mandatory and board space permits magnetics; LM3464MHX/NOPB avoids EMI filtering and simplifies layout |
Compared with LM3464AMHX/NOPB, the LM3464MHX/NOPB offers lower BOM cost and identical thermal/DHC performance below 80 V, while the LT3761EFE#PBF trades off design simplicity and EMI control for higher peak efficiency in switching mode - making LM3464MHX/NOPB the preferred choice for thermally managed, noise-sensitive, fixed-rail industrial LED drivers.
Availability
LM3464MHX/NOPB is available at Aetrix Electronics and suitable for street lighting, industrial high-bay fixtures, and architectural LED systems requiring stable component supply, long-term manufacturability, and automotive-grade thermal reliability.
Supply support for LM3464MHX/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 decades of leadership in LED driver innovation and industrial-grade reliability validation.
The LM3464MHX/NOPB belongs to TI's high-voltage linear LED driver product line, engineered specifically for thermally demanding, multi-string solid-state lighting applications where precision current matching and system-level efficiency optimization outweigh switching complexity.
FAQ
What is the maximum input voltage rating for the LM3464MHX/NOPB?
The LM3464MHX/NOPB has an absolute maximum VIN rating of 100 V, but its specified operating range is 12 V to 80 V. Exceeding 80 V during normal operation risks violating the LM3464MHX/NOPB functional specification and may trigger UVLO or cause premature wear. For 95 V operation, use the pin-compatible LM3464AMHX/NOPB variant instead.
How does the Dynamic Headroom Control (DHC) function in the LM3464MHX/NOPB improve system efficiency?
The LM3464MHX/NOPB implements DHC by sensing MOSFET drain voltages (DR1–DR4) and adjusting the OutP sink current to lower the primary supply rail (VRAIL) to the minimum needed for regulation. This reduces power dissipation in external MOSFETs - typically cutting conduction loss by 25–35% compared to fixed-rail designs - while maintaining constant LED current and color point.
Can the LM3464MHX/NOPB support both PWM and analog dimming simultaneously?
No - the LM3464MHX/NOPB uses exclusive dimming modes: DIM pin accepts logic-level PWM for digital control, while Thermal pin accepts analog voltage for thermal foldback or ambient light dimming. Using both concurrently causes undefined behavior. The LM3464MHX/NOPB's design requires selecting one interface; mixing signals may disrupt DHC stability or fault detection timing.
What thermal protection features are integrated into the LM3464MHX/NOPB?
The LM3464MHX/NOPB includes overtemperature monitoring at 125°C (TOTM-TH) with 20°C hysteresis and thermal shutdown at 165°C (TSD) with 20°C hysteresis. It also supports external NTC-based thermal foldback via the Thermal pin, allowing programmable current reduction before reaching critical junction temperatures - all implemented without external circuitry beyond the sensor and CTHM capacitor.
Is the LM3464MHX/NOPB pin-compatible with the LM3464A variant?
Yes - the LM3464MHX/NOPB and LM3464AMHX/NOPB share identical pinout, package (TSSOP-28), and functional block diagram. The only difference is the extended 12–95 V input range of the LM3464A version; all other electrical characteristics, timing, and interface behavior remain consistent, enabling drop-in replacement where voltage margin allows.
LM3464MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 12V
- Voltage - Supply (Max):
- 80V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
LM3464MHX/NOPB FAQ
1.How can I place an order for LM3464MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3464MHX/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 LM3464MHX/NOPB reliable?
The price and inventory of LM3464MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3464MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3464MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3464MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3464MHX/NOPB?
LM3464MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3464MHX/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 LM3464MHX/NOPB?
For technical support, including LM3464MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3464MHX/NOPB requirements.
6.How does Aetrix verify that LM3464MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3464MHX/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 LM3464MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3464MHX/NOPB?
All LM3464MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3464MHX/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 LM3464MHX/NOPB part is unused and in its original packaging.
Return procedure for LM3464MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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