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Texas Instruments LM3464MH/NOPB
- Part No.:
- LM3464MH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3464MH/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
LM3464MH/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 to 80V input, delivers ±3% channel-to-channel current accuracy, and drives external N-channel MOSFETs for high-power LED arrays in streetlight systems.
For engineers reviewing the LM3464MH/NOPB datasheet, LM3464MH/NOPB pinout, LM3464MH/NOPB application, or LM3464MH/NOPB equivalent, this device requires attention to DHC loop stability (CDHC capacitor), thermal sensor biasing (Thermal/Thermal_Cap), fault timing (FAULT_CAP), VDHC headroom setting, and gate driver drive strength for discrete MOSFET selection.
Technical Context
The LM3464MH/NOPB implements four independent linear current regulators using external NMOS FETs and sense resistors, each referenced to a 200 mV internal voltage reference. Its DHC architecture dynamically adjusts the primary supply rail voltage via the OutP pin to minimize MOSFET power dissipation while maintaining regulation across temperature and LED forward-voltage drift.
Thermal foldback is implemented as analog-controlled PWM dimming using an internal sawtooth generator (Thermal_Cap pin) and NTC/PTC sensor interface (Thermal pin), with programmable minimum duty cycle (DMIN pin). Fault detection includes DRx overvoltage (19 V threshold), SEx open-circuit (30 mV), and thermal shutdown at 165°C with 20°C hysteresis.
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 Headroom Voltage | 0.9 V typical at VDHC pin - sets minimum MOSFET VDS to limit conduction loss |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overtemperature in enclosed luminaires |
| Fault Response Time | Programmable via FAULT_CAP capacitor - enables adjustable delay before FAULTb assertion |
| Gate Driver Output | 4.73 V max, 0.127 V min - sufficient to fully enhance standard logic-level N-channel MOSFETs |
| Quiescent Current | 2.3 mA typical at VIN - low standby consumption for always-on lighting infrastructure |
Pinout & Package
LM3464MH/NOPB uses a thermally enhanced TSSOP-28 package (PWP) with exposed power pad (EP) tied to PGND. The 28-pin layout supports four independent LED channels, dual ground domains (AGND/PGND), and dedicated DHC, thermal, and fault interface pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DR1–DR4 | Channel drain voltage sense | Monitors MOSFET VDS to trigger DHC action or open-circuit fault when <8.4 V |
| GD1–GD4 | Gate driver output | Drives external N-MOSFET gates; 8 mA short-circuit current capability |
| SE1–SE4 | Current sense input | Connects to low-side sense resistor; regulated to 200 mV reference |
| OutP | DHC output | Sinks current into primary supply feedback node to lower rail voltage dynamically |
| VLedFB | Rail voltage sense | Monitors primary supply output; triggers DHC startup at 2.5 V threshold |
| VDHC | Headroom control | Internally biased at 0.9 V; external bias adjusts minimum MOSFET VDS |
| Thermal / Thermal_Cap | Thermal foldback interface | Accepts NTC voltage; CTHM sets dimming frequency (50 µA charge current) |
| FAULTb / FAULT_CAP | Fault signaling & timing | Open-drain fault flag; external capacitor sets fault response delay |
| EN / DIM | Enable & dimming control | Active-high enable; logic-level PWM input (1.19 V ON threshold) |
| AGND / PGND / EP | Analog & power ground | Separate AGND/PGND routing required; EP must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Reduces primary supply rail voltage in real time to match LED string VF, cutting MOSFET power loss by up to 40% vs fixed-rail designs |
| Four Independent Linear Channels | Enables precise per-string current matching (±3%) without shared current sources or complex compensation |
| Thermal Foldback Dimming | Converts NTC voltage into PWM dimming signal-no microcontroller needed for LED thermal derating |
| Dual Dimming Interface | Supports both logic-level PWM (DIM pin) and analog voltage (Thermal pin) with programmable frequency via Thermal_Cap |
| Comprehensive Fault Protection | Detects LED open/short, overtemperature, and input UVLO-asserts open-drain FAULTb with user-set delay |
Applications
| Street Lighting | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Outdoor LED streetlights operating continuously in ambient temperatures from −40°C to +85°C with seasonal VF drift. IC Role / Device Role / Timing Role: Four-channel linear current regulator with DHC maintaining constant current while minimizing MOSFET heating under varying line voltage and LED aging. Use Value: Extends LED lifetime by reducing thermal stress on MOSFETs and LEDs through adaptive rail voltage control. | Use Scenario: Warehouse high-bay fixtures with multiple high-power LED strings requiring uniform lumen output and thermal management. IC Role / Device Role / Timing Role: Thermal foldback controller interfacing directly to NTC sensors on heat sinks to reduce average current before junction temperature exceeds safe limits. Use Value: Prevents thermal runaway without firmware intervention-enables passive, reliable long-term operation. |
| Architectural Facade Lighting | Municipal Tunnel Lighting |
Use Scenario: Color-critical RGBW LED installations where constant current and stable color point are mandatory across wide temperature swings. IC Role / Device Role / Timing Role: Precision current regulator with ±3% channel matching and high-speed PWM dimming (no color shift) via DIM pin. Use Value: Maintains chromaticity coordinates by eliminating current-induced thermal gradients across LED strings. | Use Scenario: Safety-critical tunnel lighting with redundant strings and strict fault reporting requirements to central SCADA systems. IC Role / Device Role / Timing Role: Fault manager asserting open-drain FAULTb signal upon LED open/short or overtemperature, synchronized across multiple LM3464MH/NOPB units via SYNC pin. Use Value: Enables immediate system-level fault isolation and maintenance dispatch without manual inspection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3464AMH/NOPB | Extended 12–95 V input range; identical pinout and feature set | Required for higher-input AC/DC supplies (e.g., 90–100 VAC rectified) | Select when input voltage exceeds 80 V; otherwise LM3464MH/NOPB is optimal for cost and thermal performance |
| LM3409HVMM/NOPB | Single-channel buck LED controller; 6–75 V input; integrated gate driver | Used in lower-power, single-string designs where board space or cost prohibits multi-channel linear regulation | Choose for compact, efficient single-string drivers; not a drop-in replacement due to topology and channel count mismatch |
Compared with LM3464AMH/NOPB, the LM3464MH/NOPB offers tighter thermal design margin at 80 V max input and lower quiescent current; versus LM3409HVMM/NOPB, it provides four matched linear channels ideal for multi-string uniformity but requires external MOSFETs and higher board area.
Availability
LM3464MH/NOPB is available at Aetrix Electronics and suitable for street lighting, industrial high-bay fixtures, architectural facade illumination, and municipal tunnel lighting requiring stable component supply across multi-year production cycles.
Supply support for LM3464MH/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 technologies with over 50 years of leadership in industrial and automotive electronics.
The LM3464 product line was designed specifically for high-reliability, multi-string LED lighting systems requiring precision current regulation, adaptive efficiency optimization, and robust thermal/fault management-targeting outdoor and industrial solid-state lighting.
FAQ
What is the maximum input voltage rating for the LM3464MH/NOPB?
The LM3464MH/NOPB has an absolute maximum input voltage (VIN to GND) of 100 V, with a recommended operating range of 12 V to 80 V. Exceeding 80 V may trigger undervoltage lockout recovery or compromise long-term reliability; for 95 V operation, LM3464AMH/NOPB is specified.
How does the Dynamic Headroom Control (DHC) function in the LM3464MH/NOPB improve system efficiency?
The LM3464MH/NOPB reduces primary supply rail voltage in real time via its OutP pin to match the minimum required LED string forward voltage plus 0.9 V headroom. This cuts MOSFET conduction losses significantly-especially under cold-start or high-VF conditions-yielding up to 40% lower thermal dissipation versus fixed-rail designs.
Can the LM3464MH/NOPB drive LEDs directly, or does it require external components?
The LM3464MH/NOPB does not drive LEDs directly. It requires four external N-channel MOSFETs (one per channel), individual current-sense resistors (RISNS1–RISNS4), and supporting passives-including CDHC for DHC loop stability, FAULT_CAP for fault timing, and Thermal_Cap for thermal dimming frequency.
What thermal protection mechanisms are built into the LM3464MH/NOPB?
The LM3464MH/NOPB integrates overtemperature monitoring (trip at 125°C), thermal shutdown (165°C with 20°C hysteresis), and thermal foldback dimming. The latter uses the Thermal pin to accept NTC voltage and automatically reduce LED current via PWM-preventing thermal runaway without MCU intervention.
Is the LM3464MH/NOPB pin-compatible with the LM3464AMH/NOPB?
Yes, the LM3464MH/NOPB and LM3464AMH/NOPB share identical pinout, package (TSSOP-28), and functional architecture. The only difference is the extended 12–95 V input range of the LM3464AMH/NOPB; all other electrical characteristics, timing, and interface behavior are identical.
LM3464MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM3464MH/NOPB FAQ
1.How can I place an order for LM3464MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3464MH/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 LM3464MH/NOPB reliable?
The price and inventory of LM3464MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3464MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3464MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3464MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3464MH/NOPB?
LM3464MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3464MH/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 LM3464MH/NOPB?
For technical support, including LM3464MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3464MH/NOPB requirements.
6.How does Aetrix verify that LM3464MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3464MH/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 LM3464MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3464MH/NOPB?
All LM3464MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3464MH/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 LM3464MH/NOPB part is unused and in its original packaging.
Return procedure for LM3464MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3464MH/NOPB Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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