My Inquiry
My Account
Texas Instruments LM3464AMH/NOPB
- Part No.:
- LM3464AMH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3464AMH/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,210
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3464AMH/NOPB from Texas Instruments is a 4-channel linear LED current regulator IC with dynamic headroom control (DHC), thermal foldback dimming, and individual channel current regulation up to 350 mA per string. It operates from 12 V to 95 V input, interfaces externally with N-channel MOSFETs and sense resistors, and drives high-power LED arrays in streetlight and solid-state lighting systems.
For engineers reviewing the LM3464AMH/NOPB datasheet, LM3464AMH/NOPB pinout, LM3464AMH/NOPB application, or LM3464AMH/NOPB equivalent, key selection considerations include DHC loop response tuning via CDHC capacitor, thermal sensor interface at Thermal/Thermal_Cap pins, fault signaling on Faultb, and compatibility with flyback AC/DC converters via OutP/VLedFB feedback control.
Technical Context
The LM3464AMH/NOPB implements four independent linear current regulators using external NMOS FETs and 200 mV reference-based sensing. Each channel monitors drain voltage (DR1–DR4) for DHC and fault detection, while gate drivers (GD1–GD4) deliver up to 8 mA sink/source capability with 0.127 V min / 4.73 V max output swing.
DHC operation relies on closed-loop control between OutP (current-sink output), VLedFB (voltage feedback input), and VDHC (0.9 V internal bias headroom reference). Thermal foldback uses a sawtooth generator (Thermal_Cap pin, 50 µA charge current) to modulate PWM duty cycle based on DC voltage applied to Thermal pin, with minimum duty cycle set by DMIN pin voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 12 V to 95 V - supports wide-range industrial AC/DC supplies without pre-regulation |
| LED Current Accuracy | ±3% typical channel-to-channel matching - enables uniform brightness across multi-string LED arrays |
| DHC Headroom Reference | 0.9 V typical at VDHC pin - sets minimum MOSFET VDS to minimize conduction loss and heat dissipation |
| Thermal Foldback Frequency | Programmable via Thermal_Cap capacitor - defines dimming ramp rate for smooth thermal derating |
| Fault Response Time | Set by external FAULT_CAP capacitor - allows configurable delay before Faultb assertion on open/short/over-temp |
| Junction Temperature Range | −40°C to +125°C - rated for outdoor and high-ambient lighting environments |
| Package Thermal Resistance | θJA = 33.5°C/W (TSSOP-28 with EP) - requires PCB thermal vias under exposed pad for sustained 4-channel operation |
Pinout & Package
LM3464AMH/NOPB is housed in a thermally enhanced TSSOP-28 package (PWP) with exposed power ground pad (EP), supporting high-power dissipation in LED driver applications. Pin numbering follows standard top-view layout with AGND and PGND separated for analog/power ground isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DR1–DR4 | Channel drain voltage sense inputs | Monitor external NMOS drain for DHC regulation and over-voltage fault detection (19 V threshold) |
| GD1–GD4 | Gate driver outputs | Drive external NMOS gates with 8 mA short-circuit current capability and rail-to-rail swing |
| SE1–SE4 | Current sense inputs | Connect to sense resistors; internal 200 mV reference sets LED current (ILED = 200 mV / RSENSE) |
| OutP | DHC current-sink output | Sinks variable current into primary supply feedback node to dynamically lower VRAIL and maximize efficiency |
| VLedFB | Primary supply voltage feedback input | Detects when rail voltage reaches 2.5 V to initiate DHC startup sequence and system enable |
| Faultb | Open-drain fault indicator | Pulls low on LED open/short, over-temperature (>125°C), or VIN UVLO - signals host controller for safety response |
| Thermal / Thermal_Cap | Analog thermal control interface | Thermal pin accepts 0–VCC DC voltage to set dimming duty; Thermal_Cap pin hosts sawtooth generator capacitor |
| VDHC / DMIN | Headroom and minimum duty control | VDHC sets minimum MOSFET VDS; DMIN defines lowest thermal dimming duty cycle via voltage divider |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Reduces primary supply voltage to minimum required for regulation, cutting MOSFET power loss and improving system efficiency by up to 15% in streetlight applications |
| Four Independent Linear Regulators | Enables precise per-string current control without cross-talk; supports mixed LED forward voltages across channels |
| Integrated Thermal Foldback | Replaces discrete NTC circuitry with single-pin analog interface (Thermal) and programmable ramp timing (Thermal_Cap) |
| Dual Dimming Interface | Accepts either logic-level PWM (DIM pin) or analog voltage (Thermal pin) - simplifies integration with microcontrollers or ambient light sensors |
| Comprehensive Fault Protection | Detects LED open/short, over-temperature (125°C trip), VIN UVLO (8.5 V), and DRx over-voltage - latches or auto-restarts per configuration |
Applications
| Street Lighting Systems | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Outdoor LED luminaires powered from 48–72 V DC or 120–277 V AC via isolated flyback converter. IC Role / Device Role / Timing Role: Four-channel linear current regulator with DHC feedback to AC/DC converter output, maintaining constant current despite LED Vf drift and line variation. Use Value: Enables >90% system efficiency at full load by minimizing MOSFET conduction loss through real-time rail voltage optimization. |
Use Scenario: Warehouse lighting with high-temperature ambient and long LED strings requiring thermal management. IC Role / Device Role / Timing Role: Thermal foldback controller using NTC sensor on heatsink; modulates LED current via Thermal pin to limit junction temperature rise. Use Value: Extends LED lifetime by 2× through active thermal derating-no firmware or external MCU required. |
| Architectural Facade Lighting | Municipal Tunnel Lighting |
|
Use Scenario: Color-consistent RGBW LED arrays where PWM dimming must preserve chromaticity. IC Role / Device Role / Timing Role: High-speed PWM dimming controller (DIM pin) with <1 µs propagation delay and no color shift across 0.1–100% duty range. Use Value: Maintains CIE coordinates within Δu'v' < 0.003 during dimming-critical for premium architectural installations. |
Use Scenario: Safety-critical tunnel lighting with redundant fault reporting and fail-safe shutdown. IC Role / Device Role / Timing Role: Fault monitor with open-drain Faultb output tied to PLC input; asserts on any channel fault and holds until reset via EN pin. Use Value: Meets IEC 61508 SIL-2 requirements for emergency lighting control without additional supervision circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3464MH/NOPB | Lower 12–80 V input range; identical pinout, DHC, thermal, and dimming features | Suitable for 48 V nominal systems only; not rated for 95 V surge conditions in outdoor lighting | Select LM3464MH/NOPB only if input never exceeds 80 V and thermal derating margin is acceptable |
| LT3762EUFD#PBF | Switching LED controller (not linear); 60 V max input; integrated boost/buck-boost topology | Higher efficiency at high Vf mismatch but introduces EMI and requires inductor design | Choose LT3762 for >100 W systems where switching losses outweigh linear conduction losses |
Compared with LM3464MH/NOPB, the LM3464AMH/NOPB adds 15 V headroom for surge tolerance in unregulated outdoor supplies; versus LT3762, it eliminates magnetics, EMI filtering, and compensation design-but trades off peak efficiency for simplicity and thermal predictability.
Availability
LM3464AMH/NOPB is available at Aetrix Electronics and suitable for streetlight deployments, industrial high-bay fixtures, and municipal tunnel lighting requiring stable component supply across multi-year production cycles.
Supply support for LM3464AMH/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 lighting control ICs.
The LM3464A product line delivers high-accuracy, thermally robust LED current regulation for outdoor and industrial lighting - designed specifically to replace discrete thermal foldback circuits and simplify DHC implementation in AC/DC-powered luminaires.
FAQ
What is the maximum input voltage rating for LM3464AMH/NOPB?
The LM3464AMH/NOPB supports an absolute maximum input voltage of 100 V, with recommended operating range from 12 V to 95 V. This extended upper limit enables reliable operation in 277 VAC-derived DC bus applications with transient surges, unlike the LM3464MH/NOPB which is limited to 80 V.
How does the Dynamic Headroom Control (DHC) function in LM3464AMH/NOPB improve system efficiency?
The LM3464AMH/NOPB improves system efficiency by dynamically lowering the primary supply rail voltage (VRAIL) to the minimum level needed to maintain all four LED strings in regulation. It achieves this by sinking current from the AC/DC converter's feedback node via the OutP pin, reducing MOSFET VDS and conduction loss - typically yielding 10–15% higher overall efficiency versus fixed-rail designs.
Can LM3464AMH/NOPB drive LEDs with different forward voltages across its four channels?
Yes, the LM3464AMH/NOPB supports mixed forward voltage strings because each channel regulates current independently using its own sense resistor (SE1–SE4) and drain sense input (DR1–DR4). The DHC loop responds to the highest DRx voltage, ensuring all strings remain in regulation even with ±15% Vf mismatch.
What thermal protection mechanisms are implemented in LM3464AMH/NOPB?
The LM3464AMH/NOPB integrates two-tier thermal protection: over-temperature monitoring (trip at 125°C, 20°C hysteresis) and thermal foldback dimming. The latter uses the Thermal pin to accept a DC voltage from an NTC/PTC sensor, then modulates LED current via a sawtooth-controlled PWM ramp generated at Thermal_Cap - enabling gradual, predictable derating without abrupt shutdown.
Is LM3464AMH/NOPB pin-compatible with LM3464MH/NOPB?
Yes, LM3464AMH/NOPB is fully pin-compatible with LM3464MH/NOPB - same TSSOP-28 package, identical pin functions, and shared layout footprint. The only difference is the extended 95 V input rating of the 'A' variant; all other electrical characteristics, timing, and interface behavior are identical.
LM3464AMH/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):
- 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
LM3464AMH/NOPB FAQ
1.How can I place an order for LM3464AMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3464AMH/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 LM3464AMH/NOPB reliable?
The price and inventory of LM3464AMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3464AMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3464AMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3464AMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3464AMH/NOPB?
LM3464AMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3464AMH/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 LM3464AMH/NOPB?
For technical support, including LM3464AMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3464AMH/NOPB requirements.
6.How does Aetrix verify that LM3464AMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3464AMH/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 LM3464AMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3464AMH/NOPB?
All LM3464AMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3464AMH/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 LM3464AMH/NOPB part is unused and in its original packaging.
Return procedure for LM3464AMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3464AMH/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…
