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Analog Devices Inc. LT3496EFE#PBF
- Part No.:
- LT3496EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3496EFE#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT3496EFE#PBF from Analog Devices (formerly Linear Technology) is a triple-output, constant-current DC/DC LED driver IC with independent PWM dimming per channel, 750mA internal NPN switches, 3V–30V input range, and selectable 330kHz–2.1MHz switching frequency-designed for RGB lighting systems requiring precise color mixing and high-dynamic-range dimming in automotive displays and large-format signage.
For engineers reviewing the LT3496EFE#PBF datasheet, LT3496EFE#PBF pinout, LT3496EFE#PBF application, or LT3496EFE#PBF equivalent, key selection criteria include per-channel 3000:1 True Color PWM™ dimming capability, built-in PMOS gate drivers for LED disconnect, open-LED protection on all three channels, and compatibility with buck/boost/buck-boost topologies across –40°C to 125°C junction temperature.
Technical Context
The LT3496EFE#PBF implements fixed-frequency current-mode control with shared oscillator, ramp generator, and reference circuitry across three fully independent converter channels. Each channel features its own NPN power switch (750mA rated), error amplifier (VCx), PWM comparator, and PMOS gate driver (TGx) for external LED-disconnect control.
Current regulation is achieved by sensing voltage across an external resistor between CAPx and LEDx pins, with threshold set via CTRLx (10mV–100mV range) and modulated by PWMx for true-color dimming. Open-LED protection is implemented per channel using OVPx pins referenced to a 1V internal comparator threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V continuous operation; withstands 40V transients - supports wide-input industrial and automotive supplies. |
| Output Current per Channel | Programmable up to 750mA via external sense resistor - enables driving high-brightness LED strings with tight current matching. |
| Dimming Ratio | 3000:1 via True Color PWM™ at 120Hz - preserves color fidelity during deep dimming in RGB applications. |
| Switching Frequency Range | 330kHz to 2.1MHz adjustable via fADJ pin - allows optimization of efficiency vs. component size (e.g., smaller inductors at higher frequencies). |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and outdoor display environments. |
| Internal Switch VCE(SAT) | 260mV at 500mA - minimizes conduction loss and thermal stress in high-current LED drive paths. |
| Open-LED Protection | Per-channel OVPx pins with 1V threshold - disables individual converter if LED string opens, preserving operation of remaining channels. |
Pinout & Package
LT3496EFE#PBF is housed in a 28-lead plastic TSSOP package (4mm × 9.7mm) with exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity. Pin count and layout match the FE package variant specified in Linear's official documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Global shutdown control | Logic-high (>1.5V) enables all three converters; logic-low (<0.4V) places device in <10µA shutdown state. |
| PWM1–PWM3 | Per-channel dimming inputs | Active-high signals controlling both LED current delivery and TGx gate driver activation for synchronized disconnect. |
| CTRL1–CTRL3 | Current sense threshold adjust | Sets LED current sense voltage (10mV–100mV); <1V input yields 1/10× scaling for fine analog dimming or thermal foldback. |
| TG1–TG3 | PMOS gate driver outputs | Drive external P-channel MOSFETs to disconnect LEDs during PWM low phase; CAPx–TGx limited to 6.5V for gate safety. |
| CAP1–CAP3 / LED1–LED3 | Differential current sense inputs | Connect across external sense resistor; differential voltage regulated to CTRL-set threshold for precise constant-current control. |
| fADJ | Frequency programming input | Voltage from 0.1V to 1.5V sets switching frequency from 330kHz to 2.1MHz - enables EMI tuning and passive component optimization. |
| OVP1–OVP3 | Open-LED fault detection inputs | Monitor output voltage via resistor divider; >1V triggers shutdown of respective channel while others remain operational. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent constant-current regulators | Enables simultaneous RGB or multi-zone white LED control without cross-channel interference or shared feedback coupling. |
| True Color PWM™ dimming | Maintains consistent LED forward voltage and spectral output across 3000:1 intensity range - critical for accurate color mixing in displays. |
| Built-in PMOS gate drivers (TG1–TG3) | Eliminates need for external level-shifters or drivers when disconnecting LEDs during PWM off-time - reduces BOM and layout complexity. |
| Per-channel open-LED protection | Prevents overvoltage damage to downstream components and maintains system uptime by isolating faults to individual LED strings. |
| Adjustable switching frequency (330kHz–2.1MHz) | Allows trade-off between efficiency (lower fSW) and solution size (higher fSW) while maintaining stable current regulation across topologies. |
Applications
| Automotive Interior Lighting | RGB Video Billboards |
|---|---|
Use Scenario: Dynamic ambient lighting in vehicle cabins with programmable hue, saturation, and brightness. IC Role / Device Role / Timing Role: Constant-current driver for red, green, and blue LED strings with synchronized PWM dimming and thermal foldback. Use Value: Enables smooth, flicker-free color transitions and 3000:1 dimming depth required for human-centric lighting in varying daylight conditions. |
Use Scenario: Large-format outdoor digital signage with high-brightness, wide-color-gamut LED modules. IC Role / Device Role / Timing Role: Triple-output LED driver supporting independent current regulation and PWM timing for pixel-level color accuracy. Use Value: Delivers consistent luminance and chromaticity across thousands of pixels despite supply voltage variation and temperature drift. |
| Avionic Cockpit Displays | Architectural Accent Lighting |
Use Scenario: Backlighting for multifunction cockpit displays requiring MIL-STD-810G environmental resilience. IC Role / Device Role / Timing Role: High-reliability LED driver with open-LED fault isolation and –40°C to +125°C operation. Use Value: Ensures uninterrupted display illumination during rapid thermal cycling and vibration, with per-channel fault containment. |
Use Scenario: Tunable-white and color-changing architectural lighting in commercial buildings and hospitality venues. IC Role / Device Role / Timing Role: Constant-current source for multi-channel LED arrays with analog + PWM hybrid dimming via CTRL and PWM pins. Use Value: Supports DALI-2 or 0–10V control interfaces through external DACs while maintaining ±3% current accuracy across dimming range. |
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, no integrated PMOS driver, 200:1 PWM dimming | Limited to monochrome or sequential RGB drive; lacks per-channel disconnect and open-LED protection | Use only when single-string drive suffices and cost sensitivity outweighs dimming fidelity and fault tolerance. |
| TPS61165DRVR | Triple-channel, 40V boost-only, 1.5A per channel, no CTRL-based analog dimming, 1000:1 PWM | Restricted to boost topology; lacks buck/buck-boost flexibility and thermal foldback via CTRL pin | Select when high-voltage boost is mandatory and board space constraints favor TI's smaller 3mm × 3mm QFN package. |
Compared with LT3496EFE#PBF, LT3466EFE#PBF offers higher per-channel current but sacrifices channel independence and dimming precision, while TPS61165DRVR provides higher voltage capability and compact packaging but omits topology flexibility and analog dimming integration - making LT3496EFE#PBF optimal for mixed-topology, high-fidelity RGB systems.
Availability
LT3496EFE#PBF is available at Aetrix Electronics and suitable for automotive interior lighting, RGB video billboards, and avionic cockpit displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3496EFE#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, datasheet archives, and application engineering resources for legacy Linear parts including the LT3496 family.
The LT3496 product line was designed specifically for high-performance, multi-channel LED lighting systems demanding independent dimming, robust fault protection, and flexible DC/DC topology support - targeting automotive, aerospace, and premium display markets.
FAQ
What is the maximum continuous input voltage rating for the LT3496EFE#PBF?
The LT3496EFE#PBF supports continuous operation from 3V to 30V on the VIN pin. It tolerates nonrepetitive 40V transients for up to one second, as specified in the Absolute Maximum Ratings table. This 30V continuous rating makes LT3496EFE#PBF suitable for 24V automotive and industrial bus applications where transient suppression is implemented externally.
Does the LT3496EFE#PBF support buck, boost, and buck-boost configurations simultaneously across its three channels?
Yes - the LT3496EFE#PBF architecture allows each of its three channels to be independently configured in buck, boost, or buck-boost mode using external components. The internal NPN switch, diode path, and feedback structure support all three topologies without modification to the LT3496EFE#PBF itself, enabling mixed-mode designs such as buck-driven red LEDs and boost-driven blue/green strings.
How does the CTRL pin function affect LED current programming in the LT3496EFE#PBF?
In the LT3496EFE#PBF, the CTRL pin sets the current-sense threshold: if CTRL voltage is ≤1V, the effective threshold is one-tenth of that value (e.g., 100mV at CTRL = 1V); if >1V, the threshold defaults to 100mV. This dual-range behavior enables precise low-current setting (e.g., 10mA with 10mV threshold) and simplifies thermal foldback implementation using PTC thermistors on the CTRL line.
Can the LT3496EFE#PBF operate with only two active channels while the third is disabled?
Yes - the LT3496EFE#PBF allows individual channel disablement via PWMx pin grounding. When PWM1, PWM2, or PWM3 is held low, its associated converter halts switching, TGx pulls up to CAPx to disconnect the external PMOS, and VCx enters high-impedance state. The remaining active channels continue full regulation without performance degradation or instability.
What thermal management requirements apply to the LT3496EFE#PBF in TSSOP package?
The LT3496EFE#PBF in 28-lead TSSOP requires soldering of the exposed pad (Pin 29) directly to a PCB ground plane. Thermal vias beneath the pad must connect to an internal copper ground layer to achieve θJA = 30°C/W. Without proper thermal anchoring, junction temperature may exceed 125°C under full-load conditions, triggering overtemperature protection and reducing reliability.
LT3496EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LT3496EFE#PBF FAQ
1.How can I place an order for LT3496EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3496EFE#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 LT3496EFE#PBF reliable?
The price and inventory of LT3496EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3496EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3496EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3496EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3496EFE#PBF?
LT3496EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3496EFE#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 LT3496EFE#PBF?
For technical support, including LT3496EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3496EFE#PBF requirements.
6.How does Aetrix verify that LT3496EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3496EFE#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 LT3496EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3496EFE#PBF?
All LT3496EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3496EFE#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 LT3496EFE#PBF part is unused and in its original packaging.
Return procedure for LT3496EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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