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Analog Devices Inc. LT3496EUFD#PBF
- Part No.:
- LT3496EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3496EUFD#PBF.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:432
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Product details
Overview
LT3496EUFD#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 PMOS gate drivers, supports 3000:1 True Color PWM dimming at 120Hz, and delivers precise current regulation via external sense resistors - ideal for RGB backlighting and high-fidelity automotive LED arrays.
For engineers reviewing the LT3496EUFD#PBF datasheet, LT3496EUFD#PBF pinout, LT3496EUFD#PBF application, or LT3496EUFD#PBF equivalent, key selection criteria include its 3-channel independent dimming control, 330kHz–2.1MHz adjustable switching frequency, –40°C to 125°C operating junction temperature, 3V–30V input range, and QFN-28 (4mm × 5mm) thermally enhanced package with exposed ground pad.
Technical Context
The LT3496EUFD#PBF employs fixed-frequency current-mode control across three fully independent regulator channels, sharing only oscillator, reference, and bias circuitry. Each channel features dedicated PWM input, CTRL-adjustable current sense threshold (10mV–100mV), VC-compensation node, OVP protection, and TG-driven external P-channel MOSFET disconnect.
Its architecture enables simultaneous operation in mixed topologies (e.g., one channel buck, another boost), with open-LED protection per channel, undervoltage lockout at 2.4V, and thermal shutdown. The fADJ pin provides monotonic frequency scaling from 330kHz to 2.1MHz without mode hopping, optimizing efficiency vs. component size trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | Three independent constant-current regulators, each with dedicated PWM, CTRL, VC, OVP, TG, SW, CAP, and LED pins. |
| Switch Current Limit | 750mA typical per channel (1250mA max), enabling direct drive of medium-power LED strings without external switching transistors. |
| Dimming Ratio | 3000:1 True Color PWM dimming per channel at 120Hz, preserving color fidelity during deep dimming via synchronized PWM edges. |
| Input Voltage Range | 3V to 30V continuous operation; withstands 40V transients - suitable for 12V/24V automotive and industrial bus supplies. |
| Switching Frequency | Adjustable 330kHz–2.1MHz via fADJ pin voltage; higher frequencies reduce inductor/capacitor size; lower frequencies improve light-load efficiency. |
| Current Sense Threshold | Programmable 10mV–100mV via CTRL pins; sub-1V CTRL sets 1/10× threshold for fine analog dimming or thermal foldback. |
| Package & Thermal | 28-lead 4mm × 5mm QFN with exposed GND pad; θJC = 2.7°C/W enables >1.5W power dissipation with proper PCB copper area and thermal vias. |
Pinout & Package
LT3496EUFD#PBF is housed in a 28-lead plastic QFN package (4mm × 5mm) with an exposed ground pad (Pin 29) that must be soldered to the PCB ground plane for thermal and electrical integrity. Pin pitch is 0.5mm; package height is 0.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power supply input | Accepts 3V–30V; powers internal bias circuits and switch drivers; requires local 1µF ceramic bypass to GND. |
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three channels; logic-low (<0.4V) disables switching and reduces quiescent current to 0.1µA. |
| PWM1–PWM3 | Per-channel PWM dimming inputs | High enables respective converter and TG driver; low disables output, disconnects LED string, and places VC in high-Z state for linear dimming hold. |
| CTRL1–CTRL3 | Current sense threshold programming | Sets LED current sense voltage: ≤1V → 1/10×CTRL; >1V → fixed 100mV; enables analog dimming or overtemperature foldback with PTC. |
| TG1–TG3 | PMOS gate driver outputs | Drives external P-channel MOSFETs; limits CAP–TG voltage to 6.5V for gate protection; open when external FET not used. |
| SW1–SW3 | Internal NPN switch collectors | Connect to inductor and Schottky diode anode; high dv/dt node requiring minimized trace area to suppress EMI. |
| CAP1–CAP3 / LED1–LED3 | Differential current sense inputs | Form Kelvin connection across external sense resistor; CAP is inverting input, LED is noninverting input of error amplifier. |
| fADJ | Frequency adjustment input | Voltage <1V scales switching frequency down to 330kHz; ≥1V sets default 2.1MHz; must not float. |
| OVP1–OVP3 | Open-LED protection inputs | Voltage >1V disables respective channel's main switch; tied to GND if open-LED protection not required. |
| VREF | 2.0V precision reference output | Supplies up to 200µA; used for biasing CTRL, fADJ, or external circuits; line regulation <0.03%/V. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent PWM dimming | Enables precise RGB color mixing and dynamic white point tuning without cross-channel interference or shared timing constraints. |
| Built-in PMOS gate drivers | Eliminates need for external level-shifters or discrete drivers; supports fast turn-on/turn-off (<110ns delay) for high-fidelity dimming waveforms. |
| Adjustable 330kHz–2.1MHz switching | Allows optimization of magnetic component size (higher f) vs. conduction loss (lower f) across input/output voltage combinations. |
| True Color PWM™ architecture | Maintains consistent LED forward voltage and thermal profile during PWM on/off cycles, preventing color shift at low duty cycles. |
| Per-channel open-LED protection | Isolates fault conditions: single-string open-circuit disables only affected channel while others continue normal operation. |
| Wide 3V–30V input range | Supports direct connection to unregulated 12V/24V rails and battery inputs with transient tolerance up to 40V for automotive load-dump immunity. |
Applications
| RGB Backlighting | Automotive Exterior Lighting |
|---|---|
Use Scenario: Driving red, green, and blue LED strings in LCD TV or monitor backlight units with independent intensity control. IC Role / Device Role / Timing Role: Constant-current source per color channel with synchronized PWM dimming to maintain white point accuracy across brightness levels. Use Value: Achieves 3000:1 dimming ratio while preserving color gamut and eliminating visible PWM flicker at 120Hz. |
Use Scenario: Powering front position lamps, DRLs, and tail lamps in vehicles where EMI, thermal robustness, and fault isolation are critical. IC Role / Device Role / Timing Role: Triple-output LED driver supporting mixed topologies (e.g., buck for DRL, boost for tail lamp) with integrated open-LED detection per channel. Use Value: Enables single-chip solution for multi-function lighting with AEC-Q100-compliant thermal design and no single-point failure mode. |
| Billboard & Large Format Displays | Avionic Cabin Lighting |
Use Scenario: Controlling high-brightness LED modules in outdoor digital signage exposed to wide ambient temperature swings and variable input voltage. IC Role / Device Role / Timing Role: High-efficiency constant-current regulator with 3V–30V input range and thermal foldback via CTRL–PTC interface. Use Value: Delivers stable luminance over –40°C to +85°C ambient with automatic current reduction above safe junction temperature. |
Use Scenario: Regulating RGBW LED arrays in aircraft cabin mood lighting systems requiring low EMI, high reliability, and strict dimming linearity. IC Role / Device Role / Timing Role: Precision current source with 10mV–100mV programmable sense threshold and minimal channel-to-channel crosstalk. Use Value: Supports DALI or ARINC 629-compatible dimming protocols via externally generated PWM signals with sub-1% current matching. |
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 |
|---|---|---|---|
| LT3466EFE#PBF | Single-channel, 1.4A switch, 3000:1 PWM dimming, same 330kHz–2.1MHz fADJ range but no integrated PMOS drivers. | Requires external PMOS gate drivers and additional ICs for triple-channel operation; larger BOM and layout area. | Select when only one channel is needed or when using discrete high-side switches for higher voltage capability. |
| TPS61165DRVR | Single-channel, 40V boost LED driver with I²C interface; no independent PWM inputs, no PMOS drivers, max 1.2A switch current. | Lacks multi-channel independence and True Color PWM; relies on digital interface for dimming control instead of hardware PWM pins. | Prefer for space-constrained designs needing serial configuration and where software-controlled dimming suffices. |
Compared with LT3496EUFD#PBF, LT3466EFE#PBF offers higher per-channel current but requires duplication for triple output and adds external driver complexity, while TPS61165DRVR trades hardware flexibility for digital configurability and reduced channel count - making LT3496EUFD#PBF optimal for deterministic, high-fidelity multi-color LED systems.
Availability
LT3496EUFD#PBF is available at Aetrix Electronics and suitable for RGB backlighting, automotive exterior lighting, and large-format display applications requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LT3496EUFD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3496EUFD#PBF belongs to Linear's high-efficiency LED driver product line, engineered specifically for multi-channel, high-dimming-ratio solid-state lighting systems demanding precision current regulation, topology flexibility, and robust fault protection.
FAQ
What is the maximum continuous input voltage rating for the LT3496EUFD#PBF?
The LT3496EUFD#PBF supports continuous operation from 3V to 30V on the VIN pin. It also withstands nonrepetitive 1-second transients up to 40V, making it suitable for automotive 12V/24V systems subject to load dump events. This rating is confirmed in the Absolute Maximum Ratings table and applies specifically to the LT3496EUFD#PBF variant in its QFN-28 package.
Does the LT3496EUFD#PBF support buck, boost, and buck-boost configurations simultaneously?
Yes - the LT3496EUFD#PBF allows each of its three channels to operate independently in buck, boost, or buck-boost topology. The datasheet confirms this capability in the Features section and Typical Applications, where mixed-mode examples (e.g., one buck, two boost channels) are shown. No shared power stage components are required between channels.
How does the CTRL pin function in the LT3496EUFD#PBF for LED current programming?
In the LT3496EUFD#PBF, the CTRL pin sets the current sense threshold: if CTRL voltage ≤1V, the threshold is 1/10×CTRL; if >1V, it defaults to 100mV. This enables both fine analog dimming and overtemperature protection when paired with a PTC thermistor. The relationship is explicitly defined in the Applications Information section and Electrical Characteristics table.
What is the purpose of the TG pins on the LT3496EUFD#PBF?
The TG1–TG3 pins on the LT3496EUFD#PBF are dedicated gate drivers for external P-channel MOSFETs used to disconnect LED strings during PWM off-time. Each TG pin limits CAP–TG voltage to 6.5V for gate protection and provides fast turn-on/turn-off (<110ns). They are optional - left open if external disconnect FETs are not used.
Can the LT3496EUFD#PBF achieve 3000:1 dimming with unsynchronized PWM signals on its three channels?
No - the LT3496EUFD#PBF requires synchronized rising edges on PWM1, PWM2, and PWM3 to achieve full 3000:1 True Color PWM dimming. As stated in the Applications Information section, unsynchronized PWM causes color shift and reduced effective dimming ratio due to phase misalignment between channels. Synchronization is mandatory for specified performance.
LT3496EUFD#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)
LT3496EUFD#PBF FAQ
1.How can I place an order for LT3496EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496EUFD#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 LT3496EUFD#PBF reliable?
The price and inventory of LT3496EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3496EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496EUFD#PBF?
LT3496EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496EUFD#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 LT3496EUFD#PBF?
For technical support, including LT3496EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496EUFD#PBF requirements.
6.How does Aetrix verify that LT3496EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3496EUFD#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 LT3496EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3496EUFD#PBF?
All LT3496EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496EUFD#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 LT3496EUFD#PBF part is unused and in its original packaging.
Return procedure for LT3496EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3496EUFD#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
Infineon Technologies
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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
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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