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Texas Instruments LM3464AMHX/NOPB
- Part No.:
- LM3464AMHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3464AMHX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,657
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Product details
Overview
LM3464AMHX/NOPB from Texas Instruments is a 4-channel linear LED current regulator IC with dynamic headroom control (DHC), thermal foldback dimming, and PWM/analog dimming interfaces. It operates from 12V–95V input, delivers ±3% channel-to-channel current accuracy, supports up to 350mA per channel, and drives external N-channel MOSFETs for high-power LED arrays in streetlight and solid-state lighting systems.
For engineers reviewing the LM3464AMHX/NOPB datasheet, LM3464AMHX/NOPB pinout, LM3464AMHX/NOPB application, or LM3464AMHX/NOPB equivalent, key selection criteria include DHC loop response tuning via CDHC, thermal sensor interface compatibility with NTC/PTC, fault signaling via open-drain Faultb, and precise 200mV current-sense reference voltage for LED current setting.
Technical Context
The LM3464AMHX/NOPB implements four independent linear current regulators using external NMOS FETs, each controlled by a 200mV precision reference amplifier and gate driver (GD1–GD4). Drain voltage sensing (DR1–DR4) enables real-time headroom monitoring for DHC feedback.
DHC operation relies on OutP current sinking into the primary power supply's feedback node, modulated by CDHC capacitor timing and VDHC bias voltage (internally 0.9V, adjustable 0.8–2.0V). Thermal foldback uses a sawtooth generator (Thermal_Cap pin, 50µA charge current) to convert analog thermal voltage into PWM duty-cycle reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 12V–95V - 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. |
| Current Sense Reference | 200mV typical - Enables precise current setting with 1% RISNS resistors (e.g., 350mA @ 571mΩ). |
| DHC Response Time | Set by CDHC capacitor - Configurable loop bandwidth to avoid instability with primary supply dynamics. |
| Thermal Foldback Frequency | Programmable via CTHM - Sawtooth ramp (0.4V–3.25V) defines dimming frequency for thermal management. |
| Fault Detection | DRx overvoltage (19V typ), SEx open (30mV), short-circuit (8.4V) - Enables robust LED string protection. |
| Junction Temp Range | −40°C to +125°C - Rated for outdoor lighting environments with extended thermal cycling. |
Pinout & Package
LM3464AMHX/NOPB is housed in a thermally enhanced TSSOP-28 package (PWP) with exposed thermal pad (EP) electrically connected to PGND. The 28-pin layout supports four independent LED channels, dual ground domains (AGND/PGND), and dedicated DHC, thermal, and fault interfaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DR1–DR4 | Channel drain voltage sense | Monitors MOSFET VDS to trigger DHC action and detect LED open/short faults. |
| GD1–GD4 | Gate driver output | Drives external N-channel MOSFET gates with 4.73V max output and 8mA short-circuit current. |
| SE1–SE4 | Current sense input | Connects to low-side sense resistors; referenced to 200mV internal precision bandgap. |
| OutP | DHC output | Current-sinking output tied to AC/DC feedback node to dynamically lower rail voltage. |
| VDHC | Headroom control voltage | Adjusts minimum MOSFET VDS (default 0.9V); external bias sets 0.8–2.0V range. |
| Thermal / Thermal_Cap | Thermal foldback interface | Accepts analog thermal voltage; CTHM sets sawtooth frequency for PWM-based dimming reduction. |
| Faultb | Fault signal output | Open-drain output pulled low during LED open/short, overtemperature, or UVLO events. |
| VIN / VCC / EN | Power & enable inputs | VIN: 12–95V main supply; VCC: 6.3V internal LDO output; EN: active-high enable with internal pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Reduces power dissipation in external MOSFETs by lowering LED rail voltage to minimum required headroom (0.9V typ), improving system efficiency up to 15% vs fixed-rail designs. |
| Four Independent Linear Regulators | Enables precise per-string current control (350mA/channel typical) without cross-talk, supporting mixed-color or variable-length LED strings. |
| Thermal Foldback Interface | Converts NTC/PTC sensor voltage into programmable PWM dimming to reduce LED drive current before thermal shutdown, extending LED lifetime. |
| Dual Dimming Control | Supports both logic-level PWM (DIM pin) and analog voltage (Thermal pin) for flexible brightness control without color shift. |
| Comprehensive Fault Protection | Detects LED open (SEx <30mV), short (DRx <8.4V), overvoltage (DRx >19V), overtemperature (125°C), and UVLO - all signaled via Faultb. |
Applications
| Street Lighting | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Outdoor LED streetlights operating 24/7 under ambient temperatures from −40°C to +85°C with mandatory thermal derating. IC Role / Device Role / Timing Role: LM3464AMHX/NOPB acts as the primary LED current controller, managing four parallel LED strings while dynamically adjusting rail voltage and reducing current via thermal foldback. Use Value: Extends LED lifetime by 40%+ through proactive thermal current reduction and eliminates overvoltage stress on MOSFETs via DHC. |
Use Scenario: Warehouse high-bay fixtures with high lumen output requirements and strict energy efficiency mandates (e.g., DLC Premium). IC Role / Device Role / Timing Role: LM3464AMHX/NOPB regulates four independent 350mA LED channels, synchronizes dimming across multiple units via SYNC pin, and interfaces with building management systems via analog dimming input. Use Value: Achieves >92% system efficiency at full load and enables seamless 0–100% dimming without color shift or audible noise. |
| Architectural Facade Lighting | Municipal Tunnel Lighting |
|
Use Scenario: Color-consistent RGBW facade lighting where channel-to-channel current matching is critical for uniform white point. IC Role / Device Role / Timing Role: LM3464AMHX/NOPB provides ±3% current matching across four channels, supports PWM dimming synchronization across multiple ICs, and maintains regulation during rapid ambient temperature swings. Use Value: Eliminates visible color banding between adjacent LED modules and ensures stable CCT over temperature. |
Use Scenario: Long-tunnel installations requiring fail-safe operation, EMI resilience, and immunity to voltage transients from vehicle ignition. IC Role / Device Role / Timing Role: LM3464AMHX/NOPB serves as the fault-tolerant LED driver with redundant fault signaling (Faultb), VIN UVLO (8.5V), and robust DRx overvoltage protection (19V threshold). Use Value: Reduces unscheduled maintenance by detecting and isolating single-string failures before cascading damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3464MHX/NOPB | Lower 12–80V input range; identical pinout, DHC, and thermal features; no functional difference except VIN rating. | Suitable for 48V DC systems only; not rated for 95V surge conditions in AC/DC-fed streetlights. | Select LM3464MHX/NOPB only when input never exceeds 80V and cost sensitivity outweighs voltage margin. |
| TPS92692QPWPRQ1 | Automotive-grade 4-channel LED controller with integrated MOSFET drivers; supports 5.5–65V input; includes spread-spectrum clocking. | Designed for AEC-Q100 automotive lighting; lacks DHC and thermal foldback; requires external current sense amps. | Choose TPS92692QPWPRQ1 for automotive headlamp modules; LM3464AMHX/NOPB remains preferred for industrial thermal management. |
Compared with LM3464MHX/NOPB, LM3464AMHX/NOPB adds 15V headroom for universal AC/DC compatibility; versus TPS92692QPWPRQ1, it provides superior thermal foldback and DHC efficiency gains but requires external MOSFETs and higher system design effort.
Availability
LM3464AMHX/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 lifecycle support, and traceable sourcing for outdoor-rated electronics.
Supply support for LM3464AMHX/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 experience in LED driver innovation and industrial-grade reliability.
The LM3464A product line was designed specifically for high-efficiency, thermally adaptive LED lighting systems requiring dynamic rail optimization and robust fault handling in harsh environments.
FAQ
What is the maximum LED string voltage supported by LM3464AMHX/NOPB?
The LM3464AMHX/NOPB itself does not limit LED string voltage; it regulates current through external MOSFETs. The maximum string voltage is determined by the MOSFET's VDS rating and the primary supply rail (up to 95V). For example, with a 90V rail and 0.9V DHC headroom, strings up to 89.1V forward voltage are supported. Always verify MOSFET SOA and thermal design for continuous operation.
How does the Dynamic Headroom Control (DHC) function improve system efficiency?
LM3464AMHX/NOPB improves system efficiency by continuously adjusting the LED rail voltage via the OutP pin to maintain only the minimum required headroom (typically 0.9V) across each MOSFET. This reduces power dissipation (P = I × VDS) in the pass devices, yielding up to 15% higher overall efficiency compared to fixed-rail solutions-especially critical in high-power streetlight applications.
Can LM3464AMHX/NOPB be used with analog dimming only, without PWM?
Yes, LM3464AMHX/NOPB supports analog dimming exclusively via the Thermal pin, which accepts a 0–VCC DC voltage to control average LED current. When analog dimming is enabled, the Thermal_Cap pin generates a sawtooth waveform to convert the analog input into PWM dimming, eliminating flicker and preserving color consistency without requiring external PWM generators.
What thermal protection mechanisms does LM3464AMHX/NOPB provide?
LM3464AMHX/NOPB provides two-tier thermal protection: (1) Overtemperature monitor (TOTM) triggers at 125°C with 20°C hysteresis to initiate thermal foldback dimming, and (2) Hard thermal shutdown (TSD) activates at 165°C with 20°C hysteresis to disable outputs. Both functions use the same Thermal pin interface and require an external NTC/PTC sensor connected with proper biasing.
Is LM3464AMHX/NOPB pin-compatible with LM3464MHX/NOPB?
Yes, LM3464AMHX/NOPB is fully pin-compatible with LM3464MHX/NOPB, sharing identical pinout, package (TSSOP-28), and functional architecture. The only difference is the extended 12–95V input voltage rating of the LM3464A variant versus 12–80V for the LM3464. No PCB changes are required when upgrading from LM3464MHX/NOPB to LM3464AMHX/NOPB.
LM3464AMHX/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):
- 95V
- 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
LM3464AMHX/NOPB FAQ
1.How can I place an order for LM3464AMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3464AMHX/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 LM3464AMHX/NOPB reliable?
The price and inventory of LM3464AMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3464AMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3464AMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3464AMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3464AMHX/NOPB?
LM3464AMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3464AMHX/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 LM3464AMHX/NOPB?
For technical support, including LM3464AMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3464AMHX/NOPB requirements.
6.How does Aetrix verify that LM3464AMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3464AMHX/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 LM3464AMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3464AMHX/NOPB?
All LM3464AMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3464AMHX/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 LM3464AMHX/NOPB part is unused and in its original packaging.
Return procedure for LM3464AMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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