My Inquiry
My Account
Texas Instruments LM3463SQ/NOPB
- Part No.:
- LM3463SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LM3463SQ/NOPB.pdf
- Description:
- IC LED DRIVER LINEAR PWM 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,948
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3463SQ/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, <±1% current variation over −40°C to +125°C, and regulates up to 350 mA per channel using external MOSFETs and sense resistors.
For engineers reviewing the LM3463SQ/NOPB datasheet, LM3463SQ/NOPB pinout, LM3463SQ/NOPB application, or LM3463SQ/NOPB equivalent, this device supports analog dimming via IOUTADJ, individual PWM dimming on six channels (DIM01–DIM5), thermal fold-back protection, DHC-driven rail voltage optimization, and cascade operation for extended channel count.
Technical Context
The LM3463SQ/NOPB integrates six independent low-side linear current regulators, each with dedicated gate drivers (GD0–GD5), sense inputs (SE0–SE5), and drain voltage feedback pins (DR0–DR5) for DHC loop closure. Its internal 2.5 V reference (VREF) and precision current-sense amplifier enable stable regulation with REFRTN as isolated small-signal ground reference.
DHC operation uses CDHC capacitor programming and OutP open-drain output to dynamically adjust primary supply rail voltage-minimizing MOSFET power dissipation by regulating the lowest MOSFET drain voltage to 1 V. Fault handling includes LED open/short detection, thermal shutdown at 165°C, and UVLO on VIN (7.4 V turn-on) and VCC (4.7 V turn-on).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Six independent linear LED current regulators with individual gate drive and sense paths |
| Output Current Accuracy | ±1% channel-to-channel matching; <±1% variation across −40°C to +125°C |
| Supply Voltage Range | 12 V to 95 V input (VIN); enables direct integration with industrial-grade DC bus supplies |
| DHC Output Range | OutP drives rail feedback node to maintain minimum MOSFET VDS = 1 V, reducing heat in external FETs |
| Dimming Interfaces | Analog (IOUTADJ), 6-channel PWM (DIM01–DIM5), and serial bus mode via DIM01/DIM23 pins |
| Thermal Protection | Thermal shutdown at 165°C with 20°C hysteresis; built-in MOSFET power limiting via DRVLIM pin |
| Package | 48-pin WQFN (RHS), 7 mm × 7 mm, exposed thermal pad (EP) for 2.5°C/W θJC |
Pinout & Package
LM3463SQ/NOPB is housed in a 48-lead plastic WQFN package (Package Number RHS, 7 mm × 7 mm) with an exposed thermal pad (EP) requiring external connection to GND via ≥9 vias for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFRTN (Pin 1) | Small-signal reference ground | Isolated return for current-sense resistors to eliminate trace-resistance-induced channel mismatch |
| IOUTADJ (Pin 2) | Analog dimming control input | Voltage-adjustable output current scaling (0–2.5 V) for global brightness control |
| VREF (Pin 3) | Precision reference output | 2.499 V ±0.05 V regulated reference for current-sense amplifier biasing |
| EN (Pin 4) | Enable input | Internal pull-up; logic-low disables all channels and reduces quiescent current to 800 µA |
| FS (Pin 5) | Oscillator frequency setting | Resistor-to-GND sets internal clock (0.9–1.15 MHz) for PWM timing and ADC sampling |
| Faultb (Pin 6) | Open-drain fault indicator | Pulled low on LED open circuit, thermal shutdown, or UVLO; requires external pull-up |
| DIM01–DIM5 (Pins 7–10) | Multi-function dimming inputs | Support direct PWM, DC voltage dimming, or serial data/clock depending on MODE pin state |
| DR0–DR5 (Pins 25,27,29,31,33,35) | Drain voltage feedback inputs | Feed MOSFET drain-to-LED cathode voltage into DHC comparator for real-time rail optimization |
| GD0–GD5 (Pins 37,38,40,42,44,46,48) | Gate drive outputs | 5.75 V max drive voltage with 16 mA short-circuit capability for N-channel MOSFET control |
| SE0–SE5 (Pins 37,39,41,43,45,47) | Current sense inputs | Measure voltage across RISNSn to regulate IOUT = VSENSE/RISNSn with 200 mV nominal reference |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Reduces MOSFET power loss by dynamically adjusting primary supply rail to maintain VDRn ≥ 1 V |
| 6-Channel Independent Dimming | Each channel supports separate PWM duty control (DIM01–DIM5) or synchronized analog scaling |
| Thermal Fold-Back Protection | Automatically reduces LED current when junction temperature exceeds safe threshold |
| Built-In MOSFET Power Limiting | DRVLIM pin sets maximum VDRn × ILED product to prevent FET thermal runaway |
| Cascade Operation Support | SYNC and CLKOUT pins enable daisy-chained configuration for >6 channel systems without external logic |
Applications
| Street Lighting Systems | Solid-State Lighting Fixtures |
|---|---|
Use Scenario: Outdoor LED luminaires powered from 48 V–95 V DC distribution rails with thermal management constraints. IC Role / Device Role / Timing Role: Six-channel linear current regulator with DHC interface to switching front-end, enabling adaptive rail voltage reduction during cold start or dimming. Use Value: Extends LED lifetime by minimizing MOSFET junction temperature rise and improves system efficiency by >12% vs fixed-rail designs. |
Use Scenario: Architectural and commercial lighting fixtures requiring precise multi-zone dimming and color consistency. IC Role / Device Role / Timing Role: Channel-isolated current controller supporting independent PWM dimming per zone (via DIM01–DIM5) and analog master dimming (IOUTADJ). Use Value: Achieves <±1% inter-channel current match across temperature, ensuring uniform lumen output and eliminating visible brightness banding. |
| Industrial High-Bay Lighting | Municipal Smart Lighting Nodes |
Use Scenario: Warehouse and factory lighting operating continuously under high ambient temperatures (up to 85°C ambient). IC Role / Device Role / Timing Role: Thermal-aware LED driver with fold-back dimming and MOSFET power limiting (DRVLIM) to sustain reliability in thermally constrained enclosures. Use Value: Prevents thermal runaway during prolonged operation by reducing current before junction temperature reaches 165°C shutdown threshold. |
Use Scenario: Networked streetlights with remote monitoring, fault reporting, and adaptive dimming based on occupancy or time-of-day schedules. IC Role / Device Role / Timing Role: Fault-aware driver with open-drain Faultb output and serial interface mode for integration with microcontroller-based control nodes. Use Value: Enables automated fault logging (LED open/short, thermal event) and synchronized dimming updates across multiple luminaires via cascade mode. |
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 | Same 48-pin WQFN package; adds integrated 6-channel PWM generator and enhanced serial interface (I²C-compatible) | Eliminates need for external MCU PWM generation; supports addressable multi-device networks | Select when system-level dimming control requires embedded timing logic and reduced host processor overhead |
| TPS92692QPWPRQ1 | Automotive-qualified AEC-Q100 Grade 1; supports 65 V max VIN; includes spread-spectrum clocking and enhanced EMI control | Designed for automotive headlamp and exterior lighting with stringent EMC and reliability requirements | Select for transportation applications requiring automotive qualification and lower EMI emissions |
Compared with LM3463SQ/NOPB, LM3464MTX/NOPB offers integrated PWM generation and richer serial protocol support, while TPS92692QPWPRQ1 provides automotive qualification and EMI-hardened design-neither is pin-compatible, but both serve overlapping high-channel-count LED driver use cases with distinct system-level trade-offs.
Availability
LM3463SQ/NOPB is available at Aetrix Electronics and suitable for street lighting, solid-state lighting fixtures, and industrial high-bay installations requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across temperature extremes.
Supply support for LM3463SQ/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 lighting control ICs.
The LM3463SQ/NOPB belongs to TI's high-efficiency LED driver product line, engineered specifically for outdoor and industrial solid-state lighting where thermal resilience, channel accuracy, and dynamic rail optimization are critical.
FAQ
What is the primary function of the LM3463SQ/NOPB in an LED lighting system?
The LM3463SQ/NOPB functions as a six-channel linear LED current regulator with Dynamic Headroom Control (DHC). It precisely regulates current through external MOSFETs and sense resistors per channel, while interfacing with the primary power supply's feedback node to minimize MOSFET power dissipation. The LM3463SQ/NOPB ensures ±1% channel matching and maintains stable output across −40°C to +125°C, making it ideal for high-reliability street and industrial lighting.
How does the DHC feature of the LM3463SQ/NOPB improve system efficiency?
The DHC feature in the LM3463SQ/NOPB improves system efficiency by dynamically adjusting the primary power supply's output voltage via the OutP pin, ensuring the lowest MOSFET drain voltage remains at 1 V. This minimizes VDS × ILED power loss in external FETs. Measured results show >12% efficiency gain versus fixed-rail designs, especially during partial-load and cold-start conditions where forward voltage drift would otherwise increase dissipation.
Can the LM3463SQ/NOPB support both analog and PWM dimming simultaneously?
Yes-the LM3463SQ/NOPB supports simultaneous analog and PWM dimming. The IOUTADJ pin provides global analog dimming (0–2.5 V) that scales all six channels proportionally, while DIM01–DIM5 pins accept independent PWM signals for per-channel duty control. In DC interface mode, DIM01–DIM5 also accept analog voltages for individual channel dimming. The LM3463SQ/NOPB internally combines both inputs without conflict, enabling hybrid dimming strategies.
What thermal protection mechanisms are implemented in the LM3463SQ/NOPB?
The LM3463SQ/NOPB implements three-tiered thermal protection: (1) junction thermal shutdown at 165°C with 20°C hysteresis, (2) programmable MOSFET power limiting via the DRVLIM pin to cap VDRn × ILED, and (3) thermal fold-back dimming that progressively reduces LED current above safe temperature thresholds. These features prevent thermal runaway in enclosed luminaires and ensure compliance with IEC 62384 and UL 8750 safety standards.
Is the LM3463SQ/NOPB compatible with cascade configurations for more than six LED channels?
Yes-the LM3463SQ/NOPB supports cascade operation using SYNC and CLKOUT pins to synchronize multiple devices. In cascade mode, one LM3463SQ/NOPB acts as master, distributing dimming commands and timing signals to slave units, enabling scalable channel counts beyond six without external logic. Each device retains independent current regulation and fault reporting, and the LM3463SQ/NOPB's serial interface mode further simplifies multi-device addressing and configuration.
LM3463SQ/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)
LM3463SQ/NOPB FAQ
1.How can I place an order for LM3463SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3463SQ/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 LM3463SQ/NOPB reliable?
The price and inventory of LM3463SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3463SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3463SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3463SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3463SQ/NOPB?
LM3463SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3463SQ/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 LM3463SQ/NOPB?
For technical support, including LM3463SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3463SQ/NOPB requirements.
6.How does Aetrix verify that LM3463SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3463SQ/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 LM3463SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3463SQ/NOPB?
All LM3463SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3463SQ/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 LM3463SQ/NOPB part is unused and in its original packaging.
Return procedure for LM3463SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3463SQ/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…
