My Inquiry
My Account
Texas Instruments LM3463SQX/NOPB
- Part No.:
- LM3463SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LM3463SQX/NOPB.pdf
- Description:
- IC LED DRIVER LINEAR PWM 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3463SQX/NOPB from Texas Instruments is a six-channel linear LED current regulator with Dynamic Headroom Control (DHC), designed for high-efficiency streetlight and solid-state lighting systems. It delivers ±1% channel-to-channel current matching and <±1% current variation over −40°C to +125°C, regulating up to 350 mA per channel using external MOSFETs and sense resistors, with DHC output (OutP) dynamically adjusting primary supply rail voltage to minimize MOSFET power dissipation.
For engineers reviewing the LM3463SQX/NOPB datasheet, LM3463SQX/NOPB pinout, LM3463SQX/NOPB application, or LM3463SQX/NOPB equivalent, key selection considerations include its 48-pin WQFN package, six independent gate drivers (GD0–GD5), dual dimming interface support (analog IOUTADJ + PWM/Digital DIM01–DIM5), thermal fold-back protection, and integrated MOSFET power limiting via DRVLIM.
Technical Context
The LM3463SQX/NOPB integrates six independent low-side linear current regulators, each with dedicated gate drive (GDn), sense input (SEn), and drain voltage feedback (DRn) pins to enable per-channel DHC operation. Its internal 2.5 V reference (VREF) and adjustable current-sense threshold (via IOUTADJ) support precise analog dimming across all channels simultaneously.
It implements three configurable dimming modes-direct PWM, serial bus, and DC voltage-selected by the MODE pin, and features built-in fault detection (open/short LED, thermal shutdown, UVLO) with open-drain Faultb output and programmable debounce via FCAP. The DHC loop uses CDHC capacitor programming and maintains minimum MOSFET drain voltage at 0.95 V under steady state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Six independent linear LED current regulators with individual GDn/SEn/DRn interfaces |
| Supply Voltage Range | 12 V to 95 V VIN - supports wide-input industrial LED drivers without pre-regulation |
| Current Accuracy | ±1% channel-to-channel matching and <±1% variation over −40°C to +125°C - enables uniform luminance in multi-string arrays |
| DHC Output Range | OutP sinks 1 mA with 0.05–3.25 V swing - drives optocoupler or error amplifier in primary supply feedback path |
| Reference Voltage | VREF = 2.453–2.564 V - stable precision reference for current-sense comparator and IOUTADJ scaling |
| Thermal Protection | 165°C shutdown with 20°C hysteresis - prevents MOSFET thermal runaway during overload or poor heatsinking |
| Package | 48-pin WQFN (7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad) - optimized for high-power density LED driver PCBs |
Pinout & Package
LM3463SQX/NOPB uses a 48-lead plastic WQFN package (RHS) with an exposed thermal pad (EP) requiring external connection to GND via ≥9 vias for thermal performance (θJC = 2.5°C/W). Pin numbering follows standard top-view layout with 6×8 grid.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GD0–GD5 | Gate drive outputs | Drive external N-channel MOSFET gates; each rated for 16 mA short-circuit current to ensure fast turn-on/turn-off |
| SE0–SE5 | Current sense inputs | Low-impedance inputs referenced to REFRTN; accept 190–210 mV sense voltage for 350 mA full-scale current |
| DR0–DR5 | Drain voltage feedback | Monitor MOSFET drain-to-cathode voltage to trigger DHC action when exceeding DRVLIM-defined threshold |
| IOUTADJ | Analog dimming control | Adjusts all channel currents proportionally; 0–2.5 V input scales output current from 0% to 100% |
| OutP | DHC output driver | Open-collector output sinking up to 1 mA; used to pull down primary supply feedback node and lower rail voltage |
| Faultb | Fault indicator | Active-low open-drain signal asserting on LED open/short, thermal shutdown, or UVLO condition |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Minimizes MOSFET power loss by regulating primary supply rail to maintain just-enough forward voltage margin across LED strings |
| Per-channel dimming flexibility | Supports simultaneous analog dimming (IOUTADJ) plus individual PWM/digital control (DIM01–DIM5) in three selectable interface modes |
| Integrated MOSFET power limiting | DRVLIM pin sets maximum allowable VDRn × ILED product per channel, preventing thermal overstress without external circuitry |
| Cascade-capable architecture | SYNC and CLKOUT pins enable master-slave chaining of multiple LM3463SQX/NOPB devices to scale beyond six channels |
| High-accuracy current regulation | Uses dedicated REFRTN return path and matched internal amplifiers to achieve <±1% channel matching despite PCB trace resistance variations |
Applications
| Street Lighting Systems | Solid-State Area Lighting |
|---|---|
Use Scenario: Outdoor LED streetlights operating continuously under wide ambient temperature swings (−40°C to +85°C) and variable line voltage. IC Role / Device Role / Timing Role: Six-channel linear current controller with DHC interface to buck converter primary stage, maintaining constant lumen output while minimizing heat generation in outdoor-rated enclosures. Use Value: Enables >90% system efficiency by dynamically reducing rail voltage as LED forward voltage drops with temperature rise, extending thermal lifetime of external MOSFETs and optics. |
Use Scenario: High-bay warehouse lighting with multiple parallel LED strings requiring uniform brightness and independent zone dimming. IC Role / Device Role / Timing Role: Centralized current regulator managing six independent LED zones; DIM01–DIM5 accept PWM signals from building management system for granular occupancy-based control. Use Value: Delivers <±1% channel matching across zones, eliminating visible brightness disparities; thermal fold-back prevents local hot spots during extended operation. |
| Architectural Facade Lighting | Industrial Tunnel Lighting |
Use Scenario: RGBW color-tunable facade modules where precise current control per channel ensures accurate white point and color rendering. IC Role / Device Role / Timing Role: Linear LED driver providing stable DC current to red, green, blue, and white LED strings; IOUTADJ enables smooth analog dimming synchronized with DMX512 controllers. Use Value: Maintains chromaticity stability over temperature via ±1% current accuracy and eliminates PWM-induced flicker in high-CRI applications. |
Use Scenario: Long-tunnel LED lighting with redundant drivers and fail-safe monitoring requirements. IC Role / Device Role / Timing Role: Fault-tolerant current regulator with open-drain Faultb output wired to PLC input; detects LED open/short and thermal events before catastrophic failure. Use Value: Reduces maintenance frequency by enabling predictive fault logging; UVLO hysteresis prevents nuisance tripping during brownout conditions common in tunnel power distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar six-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3464MTX/NOPB | Includes integrated 6-channel PWM generator and SPI interface; lacks analog IOUTADJ pin and DHC output (OutP) | Better suited for digital-control-only systems; cannot perform dynamic rail optimization like LM3463SQX/NOPB | Select when system uses microcontroller-based SPI command sequencing and does not require analog dimming or DHC feedback to primary supply |
| TPS92692QPWPRQ1 | Automotive-grade AEC-Q100 qualified; adds spread-spectrum clocking and enhanced EMI control; same 48-WQFN package | Designed for automotive headlamp modules; includes diagnostic registers and fault reporting not present in LM3463SQX/NOPB | Select for automotive lighting where qualification, diagnostics, and EMI compliance outweigh cost and feature differences |
Compared with LM3463SQX/NOPB, LM3464MTX/NOPB trades DHC capability and analog dimming for embedded PWM timing and digital configurability, while TPS92692QPWPRQ1 adds automotive robustness and diagnostics at higher cost and complexity-neither offers identical DHC-driven efficiency optimization.
Availability
LM3463SQX/NOPB is available at Aetrix Electronics and suitable for street lighting, solid-state area lighting, architectural facade lighting, and industrial tunnel lighting requiring stable component supply and long-term production continuity.
Supply support for LM3463SQX/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 and embedded processing technologies, with decades of expertise in power management and LED driver innovation.
The LM3463 product line targets high-reliability, high-efficiency LED lighting systems where thermal management, channel matching, and system-level power optimization are critical design priorities.
FAQ
What is the primary function of the OutP pin on the LM3463SQX/NOPB?
The OutP pin on the LM3463SQX/NOPB is an open-collector DHC output driver that sinks current to adjust the feedback node of the primary switching power supply. By pulling down the rail voltage reference, it dynamically reduces the output voltage to match the instantaneous LED forward voltage, minimizing power loss across external MOSFETs. This function is central to the LM3463SQX/NOPB's efficiency optimization strategy and requires external resistor-diode network connection to the primary supply's feedback divider.
How does the LM3463SQX/NOPB achieve ±1% channel-to-channel current matching?
The LM3463SQX/NOPB achieves ±1% channel-to-channel current matching through dedicated REFRTN pin routing, matched internal current-sense amplifiers, and precision 2.5 V reference (VREF) shared across all six channels. Each SE0–SE5 input connects directly to its own current-sense resistor's low-side node, referenced to REFRTN-not system GND-to eliminate errors from PCB trace resistance. This architecture ensures consistent 190–210 mV sense voltage thresholds across temperature and load, delivering the specified matching in LM3463SQX/NOPB production units.
Can the LM3463SQX/NOPB operate without an external microcontroller?
Yes, the LM3463SQX/NOPB can operate autonomously without a microcontroller when configured in direct PWM or analog dimming mode. In direct PWM mode (MODE = GND), DIM01–DIM5 accept TTL-level signals to enable/disable individual channels; in analog mode (MODE = VCC), IOUTADJ accepts a DC voltage (0–2.5 V) to scale all channel currents simultaneously. No firmware or serial communication is required for basic operation, making LM3463SQX/NOPB suitable for simple, cost-sensitive LED driver designs.
What protection features are integrated into the LM3463SQX/NOPB?
The LM3463SQX/NOPB integrates LED open/short detection, thermal shutdown (165°C with 20°C hysteresis), VIN under-voltage lockout (UVLO with 300 mV hysteresis), and MOSFET drain voltage limiting via DRVLIM. Fault conditions assert the open-drain Faultb pin and reduce output current to prevent damage. LED open detection triggers at 43 mV on SEn pins or 330 mV on DRn pins; thermal protection disables all channels until junction temperature falls below 145°C. These protections are fully hardware-based and require no external components to function in LM3463SQX/NOPB.
What is the recommended layout practice for the REFRTN pin on the LM3463SQX/NOPB?
The REFRTN pin on the LM3463SQX/NOPB must be connected via individual short, low-impedance traces to the low-side nodes of each current-sense resistor (RISNS0–RISNS5), not to system GND. This star-point grounding isolates sense-return paths from power ground noise and trace resistance mismatches, preserving the ±1% channel matching specification. TI recommends routing REFRTN as a dedicated copper pour separate from GND plane, with Kelvin connections to each RISNSn, and avoiding shared vias or daisy-chained traces-critical for achieving LM3463SQX/NOPB's published accuracy.
LM3463SQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- No
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 12V
- Voltage - Supply (Max):
- 95V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-WQFN (7x7)
LM3463SQX/NOPB FAQ
1.How can I place an order for LM3463SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3463SQX/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 LM3463SQX/NOPB reliable?
The price and inventory of LM3463SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3463SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3463SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3463SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3463SQX/NOPB?
LM3463SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3463SQX/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 LM3463SQX/NOPB?
For technical support, including LM3463SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3463SQX/NOPB requirements.
6.How does Aetrix verify that LM3463SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3463SQX/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 LM3463SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3463SQX/NOPB?
All LM3463SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3463SQX/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 LM3463SQX/NOPB part is unused and in its original packaging.
Return procedure for LM3463SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3463SQX/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…
