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Analog Devices Inc. LT3496HUFD#PBF
- Part No.:
- LT3496HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3496HUFD#PBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,922
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Product details
Overview
LT3496HUFD#PBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC operating in buck, boost, or buck-boost topology with independent PWM dimming per channel. It integrates three 750mA, 45V NPN switches and built-in P-channel MOSFET gate drivers, supporting 3000:1 True Color PWM dimming at 120Hz for RGB lighting systems in automotive instrument clusters.
For engineers reviewing the LT3496HUFD#PBF datasheet, LT3496HUFD#PBF pinout, LT3496HUFD#PBF application, or LT3496HUFD#PBF equivalent, key selection criteria include its –40°C to 150°C H-grade junction temperature rating, 330kHz–2.1MHz adjustable switching frequency, 3V–30V input range with 40V transient tolerance, and independent CTRL-pin current programming across all three channels.
Technical Context
The LT3496HUFD#PBF employs fixed-frequency current-mode control with shared oscillator, ramp generator, and reference circuitry across three replicated converter channels. Each channel features independent PWM inputs, dedicated VC error amplifier compensation pins, and OVP protection pins referenced to a 1V internal threshold.
Its architecture supports analog dimming via CTRL pins (10mV–100mV sense threshold), open-LED protection through external resistor dividers on OVP pins, and synchronized PWM rising edges for consistent color mixing. The fADJ pin enables frequency tuning from 330kHz to 2.1MHz using a single resistor or low-pass filter for soft-start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous; withstands 40V nonrepetitive transients - enables direct battery connection in 24V automotive systems without external clamping. |
| Switch Current Limit | 750mA typical per channel (1250mA max) - supports high-brightness LED strings up to 7 LEDs in series at 350mA with margin. |
| Dimming Ratio | 3000:1 True Color PWM at 120Hz - preserves color fidelity during deep dimming in RGB signage and avionic displays. |
| Operating Temperature | –40°C to +150°C junction - qualified for under-hood automotive and high-ambient industrial LED lighting. |
| Switching Frequency | Adjustable 330kHz–2.1MHz via fADJ pin - allows trade-off between efficiency (lower fSW) and component size (higher fSW). |
| Current Sense Threshold | Programmable 10mV–100mV via CTRL pins - enables precise analog dimming or overtemperature protection using PTC thermistors. |
| Package Thermal Resistance | θJC = 2.7°C/W (QFN) - requires exposed pad soldered to PCB ground plane for reliable 150°C operation. |
Pinout & Package
LT3496HUFD#PBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). The package supports high-power dissipation and compact layout for multi-channel LED systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power supply input | Accepts 3V–30V; must be bypassed with ≥1µF ceramic capacitor close to pin to suppress switching noise. |
| SHDN | Global shutdown control | Pull below 0.4V to disable all three converters and reduce quiescent current to ≤10µA. |
| PWM1–PWM3 | Independent channel enable/dimming inputs | Logic-high enables respective converter; logic-low disconnects LED string via TG driver and places VC pin in high-Z state. |
| CTRL1–CTRL3 | Current sense threshold programming | Sets LED current via external sense resistor: ILED = VCTRL/10RSENSE (if VCTRL < 1V) or 100mV/RSENSE (if ≥1V). |
| TG1–TG3 | P-channel MOSFET gate drivers | Drive external PMOS for LED disconnect; CAP–TG voltage clamped to 6.5V to protect gate oxide. |
| LED1–LED3 / CAP1–CAP3 | Current sense amplifier inputs | Form Kelvin connection across external sense resistor; minimize trace resistance to maintain ±1% current accuracy. |
| SW1–SW3 | Internal NPN switch collectors | Connect to inductor and Schottky anode; keep trace area minimal to reduce EMI radiation. |
| OVP1–OVP3 | Open-LED protection inputs | Monitor output voltage via resistor divider; >1V triggers shutdown of respective channel while others remain active. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent constant-current regulation | Enables simultaneous RGB color control with matched current accuracy across channels - critical for white-point stability in display backlighting. |
| Built-in PMOS gate drivers (TG1–TG3) | Eliminates need for external level-shifters; supports fast turn-on/turn-off (110ns delay) for clean 3000:1 PWM waveforms. |
| True Color PWM™ dimming | Maintains consistent LED forward voltage and spectral output across full dimming range - prevents hue shift in architectural and stage lighting. |
| Adjustable switching frequency (330kHz–2.1MHz) | Allows optimization for EMI compliance (lower fSW) or miniaturization (higher fSW) without redesigning magnetics or capacitors. |
| Open-LED protection per channel | Prevents overvoltage damage when individual LED strings fail open; other channels continue normal operation - improves system reliability. |
Applications
| Automotive Instrument Clusters | RGB Video Billboards |
|---|---|
Use Scenario: Driving red/green/blue LED arrays behind TFT LCDs in vehicle dashboards with ambient temperature up to 105°C. IC Role / Device Role / Timing Role: Triple-output constant-current source with independent PWM dimming per color channel and thermal derating support. Use Value: Maintains consistent luminance and chromaticity across –40°C to +105°C cabin temperatures using H-grade 150°C junction rating and CTRL-based analog trim. |
Use Scenario: Powering large-format outdoor LED panels requiring uniform brightness and color mixing across thousands of pixels. IC Role / Device Role / Timing Role: High-dimming-ratio LED driver enabling 3000:1 grayscale depth with synchronized PWM timing across RGB subpixels. Use Value: Eliminates visible flicker and color banding at low brightness levels by preserving linear light output vs. duty cycle relationship. |
| Avionic Cabin Lighting | Industrial Machine Vision Illumination |
Use Scenario: Providing certified, fault-tolerant lighting in aircraft cabins where single-point failure must not disable all lighting zones. IC Role / Device Role / Timing Role: Triple-channel driver with per-channel OVP and independent shutdown - enables modular zone control and graceful degradation. Use Value: Open-LED protection isolates faults to individual channels; remaining two channels sustain emergency lighting functionality. |
Use Scenario: High-speed strobed illumination for barcode readers and automated optical inspection systems requiring microsecond-level timing precision. IC Role / Device Role / Timing Role: Fast-response LED driver with <110ns gate drive delay and programmable fADJ for synchronization with camera trigger signals. Use Value: Enables precise exposure control and eliminates motion blur by matching LED on-time exactly to image capture window. |
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 |
|---|---|---|---|
| LT3496EUFD#PBF | H-grade (–40°C to 150°C) vs. E-grade (–40°C to 125°C); identical electrical specs and pinout | Not suitable for under-hood automotive or high-ambient industrial environments requiring >125°C operation | Select LT3496HUFD#PBF when junction temperature exceeds 125°C; otherwise EUFD offers cost advantage. |
| LT3496IUFD#PBF | Same 150°C max junction temp as H-grade but specified over –40°C to 125°C range; guaranteed performance only to 125°C | Lacks full characterization and warranty coverage above 125°C; unsuitable for sustained high-temp operation | LT3496HUFD#PBF is required for designs needing guaranteed 150°C operation; IUFD is not a drop-in replacement in thermal-critical applications. |
Compared with LT3496EUFD#PBF and LT3496IUFD#PBF, the LT3496HUFD#PBF provides fully characterized and warranted operation up to 150°C junction temperature - essential for automotive engine bay, avionics, and industrial enclosures where ambient heat cannot be actively managed.
Availability
LT3496HUFD#PBF is available at Aetrix Electronics and suitable for automotive lighting, outdoor signage, and avionic cabin systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3496HUFD#PBF 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 LT3496 family.
The LT3496 is part of Linear's high-reliability LED driver portfolio, designed specifically for multi-color, high-dimming-ratio lighting in automotive, aerospace, and industrial environments demanding wide temperature operation and fault resilience.
FAQ
What is the maximum junction temperature rating for LT3496HUFD#PBF?
The LT3496HUFD#PBF is fully specified and guaranteed over a junction temperature range of –40°C to +150°C. This H-grade qualification distinguishes it from E- and I-grade variants and makes it suitable for under-hood automotive applications and high-ambient industrial environments where passive cooling is insufficient. Thermal design must ensure the exposed pad is soldered to a robust ground plane with thermal vias to achieve this rating.
How does the LT3496HUFD#PBF implement 3000:1 True Color PWM dimming?
The LT3496HUFD#PBF achieves 3000:1 True Color PWM dimming by combining independent PWM inputs (PWM1–PWM3) with built-in gate drivers (TG1–TG3) that fully disconnect the LED string during the off-cycle. This preserves the VC amplifier's stored state and eliminates current leakage paths, ensuring linear light output vs. duty cycle. The technique maintains consistent LED forward voltage and spectral output across the entire dimming range.
Can the LT3496HUFD#PBF operate in buck, boost, and buck-boost topologies simultaneously?
Yes - each of the three channels in the LT3496HUFD#PBF can be independently configured as buck, boost, or buck-boost by selecting appropriate external components (inductor, diode, sense resistor). The internal architecture supports all three modes per channel without modification; the typical application circuits in the datasheet demonstrate each configuration individually.
What is the function of the OVP1–OVP3 pins on the LT3496HUFD#PBF?
The OVP1–OVP3 pins on the LT3496HUFD#PBF provide per-channel open-LED protection. Each pin monitors the output voltage via an external resistor divider; if the voltage exceeds 1V (indicating an open LED string), the corresponding internal switch shuts off while the other two channels continue operating normally. This fault isolation enhances system reliability in multi-string lighting applications.
How is LED current programmed on the LT3496HUFD#PBF?
LED current on the LT3496HUFD#PBF is programmed using an external sense resistor (RSENSE) in series with each LED string and the CTRL1–CTRL3 pins. If CTRL voltage is below 1V, ILED = VCTRL/(10 × RSENSE); if ≥1V, ILED = 100mV/RSENSE. This dual-range scheme enables both fine analog dimming and robust overtemperature protection using PTC thermistors.
LT3496HUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3496HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496HUFD#PBF 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#PBF reliable?
The price and inventory of LT3496HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3496HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496HUFD#PBF?
LT3496HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496HUFD#PBF 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#PBF?
For technical support, including LT3496HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496HUFD#PBF requirements.
6.How does Aetrix verify that LT3496HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3496HUFD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3496HUFD#PBF?
All LT3496HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496HUFD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3496HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3496HUFD#PBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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