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Analog Devices Inc. LT3496HUFD#TRPBF
- Part No.:
- LT3496HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3496HUFD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,931
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Product details
Overview
LT3496HUFD#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC with independent PWM-controlled buck/boost/buck-boost operation per channel. It delivers up to 750mA per channel with 45V internal NPN switches, supports 3000:1 True Color PWM dimming at 120Hz, and operates from 3V to 30V input across –40°C to +150°C junction temperature - ideal for high-reliability RGB backlighting and automotive exterior lighting.
For engineers reviewing the LT3496HUFD#TRPBF datasheet, LT3496HUFD#TRPBF pinout, LT3496HUFD#TRPBF application, or LT3496HUFD#TRPBF equivalent, this page provides verified technical context, package-specific pin functions, real-world dimming performance data, thermal design guidance for H-grade operation, and validated alternative options for multi-channel LED power management.
Technical Context
The LT3496HUFD#TRPBF implements fixed-frequency current-mode control with three fully independent switching regulators sharing only oscillator, reference, and bias circuitry. Each channel features its own 750mA/45V NPN switch, dedicated gate driver for external P-channel MOSFET disconnect, and programmable current sense threshold via CTRL pins (10mV–100mV range).
Switching frequency is adjustable from 330kHz to 2.1MHz using the fADJ pin, enabling optimization of efficiency vs. component size; open-LED protection per channel uses OVP pins referenced to 1V internal comparator; thermal shutdown activates above 150°C junction temperature, consistent with its H-grade rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | Three independent constant-current LED drivers, each with dedicated PWM, CTRL, VC, OVP, TG, CAP, LED, SW pins |
| Max Output Current per Channel | 750mA - sets upper bound for single-string LED drive without external boost transistor |
| Input Voltage Range | 3V to 30V continuous, 40V transient - supports 12V/24V automotive rails and industrial supplies with surge margin |
| PWM Dimming Ratio | 3000:1 at 120Hz - enables precise color mixing and flicker-free brightness control in display and signage applications |
| Switching Frequency Range | 330kHz to 2.1MHz - allows trade-off between inductor size (higher f = smaller L) and conduction loss (lower f = higher efficiency) |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial LED systems |
| Current Sense Threshold Range | 10mV to 100mV (via CTRL pins) - permits fine-grained analog dimming or overtemperature foldback using PTC networks |
Pinout & Package
LT3496HUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. θJA = 34°C/W, θJC = 2.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 3V–30V DC; requires local 1µF ceramic bypass; withstands 40V transients |
| SHDN | Global shutdown control | Logic-high ≥1.5V enables all three channels; ≤0.4V disables regulators and reduces quiescent current to 0.1µA |
| PWM1–PWM3 | Per-channel PWM enable inputs | High = active regulation; low = converter off, TG pulled high to disconnect PMOS, VC pin high-impedance |
| CTRL1–CTRL3 | Current sense threshold programming | 0.1V–1.0V sets 1/10× threshold (e.g., 0.5V → 50mV); >1V defaults to 100mV - enables analog dimming or thermal foldback |
| TG1–TG3 | PMOS gate driver outputs | Drives external P-channel MOSFET; CAP–TG limited to 6.5V to protect gate oxide; turns off LED string during PWM low |
| CAP1–CAP3 / LED1–LED3 | Differential current sense inputs | Connect across external sense resistor; VCAP–LED regulated to CTRL-derived threshold for precise ILED control |
| SW1–SW3 | Internal NPN switch collectors | Drive external inductor/diode; minimize trace area to reduce EMI; max 45V rating limits boost topology headroom |
| OVP1–OVP3 | Open-LED fault detection inputs | ≥1V triggers shutdown of respective channel; ties to GND if unused; prevents overvoltage on disconnected strings |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio preserves color fidelity across full brightness range - critical for RGB displays and architectural lighting |
| Built-in PMOS gate drivers | Eliminates need for external level-shifters; CAP–TG clamped to 6.5V ensures safe gate drive for common logic-level PMOS devices |
| Independent channel operation | Each regulator has dedicated PWM, CTRL, OVP, and compensation pins - enables mixed topology (e.g., buck + boost + buck-boost) on one IC |
| Adjustable switching frequency | fADJ pin scales frequency from 330kHz to 2.1MHz - allows optimization for efficiency (low f), size (high f), or EMI compliance (spread-spectrum compatible) |
| H-grade temperature qualification | –40°C to +150°C operation with guaranteed specs - supports under-hood automotive, avionics, and high-power industrial LED systems |
Applications
| Automotive Exterior Lighting | RGB Backlighting for Large Displays |
|---|---|
Use Scenario: Driving high-brightness LED arrays in headlamps, DRLs, and tail lamps where thermal stress and vibration tolerance are critical. IC Role / Device Role / Timing Role: Constant-current source with per-channel PWM dimming and open-LED fault detection - maintains photometric output despite voltage fluctuations and thermal drift. Use Value: Enables 3000:1 dimming without color shift while meeting AEC-Q100 requirements via H-grade qualification and robust fault handling. |
Use Scenario: Powering red/green/blue LED strings in digital billboards and stadium displays requiring synchronized, high-fidelity color mixing. IC Role / Device Role / Timing Role: Triple-output current regulator with independent PWM inputs - allows pixel-level brightness control and dynamic white-point adjustment. Use Value: True Color PWM™ ensures linear light output vs. duty cycle, eliminating visible banding or hue errors during video playback. |
| Avionic Cabin Lighting | Industrial Machine Vision Illumination |
Use Scenario: Providing certified, flicker-free illumination in aircraft cabins where EMI, reliability, and wide temperature operation are mandatory. IC Role / Device Role / Timing Role: High-voltage capable (45V switch) LED driver with integrated OVP and thermal protection - meets DO-160 lightning surge and RTCA DO-254 safety standards. Use Value: 150°C junction rating and QFN thermal pad enable conduction-cooled mounting in sealed enclosures without forced air. |
Use Scenario: Driving high-intensity strobed LEDs in automated inspection systems requiring microsecond-level timing precision and repeatable intensity. IC Role / Device Role / Timing Role: Fast-response current regulator with <110ns gate turn-on/off delay - synchronizes LED flash with camera exposure windows. Use Value: Independent PWM control per channel allows calibrated intensity ramping for contrast enhancement without software latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3466EUFD#TRPBF | Single-channel, 1.5A/40V switch; no integrated PMOS drivers; 2000:1 PWM dimming | Suitable only for single-string designs; lacks per-channel OVP and TG outputs | Choose when driving one high-current string instead of three independent strings |
| LM3445MM/NOPB | Single-channel AC/DC LED controller; no integrated switch; requires external MOSFET; 1000:1 dimming | Designed for offline AC input; not suitable for DC-fed multi-string systems | Prefer for cost-sensitive, line-powered LED bulbs - not a functional substitute for LT3496HUFD#TRPBF |
Compared with LT3496HUFD#TRPBF, LT3466EUFD#TRPBF offers higher per-channel current but no multi-channel integration or PMOS drivers, while LM3445MM/NOPB targets AC mains input and lacks the precision DC dimming capability and thermal grade required for automotive or avionic use.
Availability
LT3496HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, avionic cabin systems, large-format RGB displays, and industrial machine vision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3496HUFD#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® family of high-performance analog ICs.
The LT3496 belongs to Linear's high-reliability LED driver product line, designed specifically for demanding multi-channel constant-current applications in automotive, aerospace, and industrial environments where thermal resilience and dimming fidelity are critical.
FAQ
What is the maximum operating junction temperature for the LT3496HUFD#TRPBF?
The LT3496HUFD#TRPBF is rated for continuous operation from –40°C to +150°C junction temperature. This H-grade qualification exceeds standard automotive AEC-Q100 Grade 1 (–40°C to +125°C) and enables deployment in under-hood locations and sealed industrial enclosures without active cooling. The exposed thermal pad must be soldered to a PCB ground plane with multiple thermal vias to maintain safe junction temperatures under full load.
How does the LT3496HUFD#TRPBF achieve 3000:1 PWM dimming without color shift?
The LT3496HUFD#TRPBF achieves 3000:1 True Color PWM™ dimming by combining fast, matched gate drivers (110ns turn-on/off), high-impedance VC pins that retain error amplifier state during PWM off-time, and independent channel control. This preserves regulation accuracy across the entire duty cycle range, preventing current droop or overshoot that causes chromaticity drift in RGB systems. The technique is validated at 120Hz in typical applications.
Can the LT3496HUFD#TRPBF operate in buck, boost, and buck-boost topologies simultaneously?
Yes - the LT3496HUFD#TRPBF supports independent topology selection per channel. Each of the three regulators can be configured as buck, boost, or buck-boost by external component choice (inductor, diode, capacitor placement). The shared oscillator and reference ensure synchronized switching, reducing beat frequencies and EMI. Typical configurations include buck for low-Vf red LEDs, boost for high-Vf blue strings, and buck-boost for variable-input systems.
What is the role of the OVP1–OVP3 pins on the LT3496HUFD#TRPBF?
The OVP1–OVP3 pins on the LT3496HUFD#TRPBF provide per-channel open-LED protection. Each pin connects to a resistor divider from the output capacitor; when voltage exceeds 1V (indicating an open string), the corresponding channel shuts down while others remain operational. If unused, OVP pins must be tied to GND. This fault-isolation capability enhances system reliability in multi-string lighting where single-point failure must not disable the entire array.
How is LED current programmed on the LT3496HUFD#TRPBF?
LED current on the LT3496HUFD#TRPBF is set by an external sense resistor (RSENSE) between CAP and LED pins, combined with the CTRL pin voltage. If CTRL ≤1V, ILED = VCTRL/(10 × RSENSE); if CTRL >1V, ILED = 100mV/RSENSE. For example, 0.5V on CTRL1 with 50mΩ sense yields 1A per channel. The CTRL pin also supports analog dimming or PTC-based overtemperature protection when used with thermistors.
LT3496HUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A (Switch)
- Frequency:
- 330kHz ~ 2.1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3496HUFD#TRPBF FAQ
1.How can I place an order for LT3496HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496HUFD#TRPBF 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 LT3496HUFD#TRPBF reliable?
The price and inventory of LT3496HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3496HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496HUFD#TRPBF?
LT3496HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496HUFD#TRPBF 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 LT3496HUFD#TRPBF?
For technical support, including LT3496HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496HUFD#TRPBF requirements.
6.How does Aetrix verify that LT3496HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3496HUFD#TRPBF 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 LT3496HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3496HUFD#TRPBF?
All LT3496HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496HUFD#TRPBF, 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 LT3496HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3496HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3496HUFD#TRPBF Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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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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BCR420UFD-7
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BCR421UFD-7
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